Rust Jobs
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## Location: New York (Office) ## On-site | Full-time ## Compensation: $200K - $250K Our client is a high-growth fintech startup building a streamlined trading application designed to bridge the gap between complex on-chain assets and everyday users. The platform provides instant access to digital assets without the friction of external wallets or bridges, while offering advanced social trading features and institutional-grade execution data. The engineering team is composed of high-caliber, crypto-native professionals with backgrounds from industry leaders such as **dYdX**, **Uniswap**, and **OpenSea**. Following a recent move to a spacious new office in Soho, the organization is looking for a **Staff Trading Infrastructure Engineer** to spearhead the evolution of their trading infrastructure. This role is focused on the technical frontier of transaction speed, MEV prevention, and liquidity routing. ## Key Responsibilities - **Infrastructure Optimization:** Lead the development and overhaul of transaction landing infrastructure to ensure industry-leading speed and reliability - **Routing & Solvers:** Design and implement proprietary routing systems and cross-chain solvers to optimize swap efficiency for users - **Feature Development:** Architect and deploy advanced trading functionalities, including cross-chain limit orders and custom gas sponsorship infrastructure - **Strategic Planning:** Autonomously identify bottlenecks in current trading flows and execute technical roadmaps to maintain a competitive edge in a multichain environment - **Technical Leadership:** Serve as a subject matter expert for a lean team of frontend and backend engineers, maintaining high standards for code quality and performance ## Requirements - **Experience:** Minimum of 6+ years of professional software engineering experience, ideally operating at a Staff level or higher - **Domain Expertise:** Deep understanding of blockchain internals, specifically regarding how to land transactions in highly competitive environments - **Ecosystem Knowledge:** Strong experience with **Solana** is highly preferred, though exceptional candidates with deep expertise in other major ecosystems will be considered - **Problem Solving:** Proven ability to manage the entire lifecycle of complex infrastructure projects—from conceptualization to deployment—with minimal supervision - **Location:** Ability to work in-person at the client's Soho office in New York City. The organization maintains a strong in-person culture to foster collaboration and rapid iteration - **Mindset:** A curious, crypto-native approach with a genuine interest in the future of multichain interoperability ## Benefits - **Competitive Compensation:** Highly competitive salary and equity packages - **Prime Location:** Modern, spacious office located in the heart of Soho, NYC - **High-Impact Environment:** Opportunity to work alongside a small, elite team of engineers from top-tier crypto protocols - **Cutting-Edge Tech:** Direct involvement in shaping the infrastructure of a next-generation trading platform Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates. If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search. ## Commitment to Equality and Accessibility At **MLabs**, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city. **MLabs Ltd** collects and processes the personal information you provide such as your contact details, work history, resume, and other relevant data for recruitment purposes only. This information is managed securely in accordance with MLabs Ltd's Privacy Policy and Information Security Policy, and in compliance with applicable data protection laws. Your data may be shared only with clients and trusted partners where necessary for recruitment purposes. You may request the deletion of your data or withdraw your consent at any time by contacting legal@mlabs.city. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
1 day ago
## Location North America ## Employment Type Full time ## Location Type Remote ## Department Engineering --- ### About Helius **Helius** is building the core infrastructure for Solana – empowering developers to create the next generation of crypto-powered applications. Our mission is to accelerate the development of internet capital markets by making it easier, faster, and more intuitive to build on-chain. Thousands of teams – from early-stage startups to industry leaders like **Coinbase**, **Phantom**, and **Jupiter** – rely on Helius APIs, webhooks, and indexing tools to power their products. Backed by **Haun Ventures**, **Founders Fund**, and **Foundation Capital**, we’re a small, senior team obsessed with performance, simplicity, and scalability in decentralized systems. Read our Helius Manifesto to see how we work and what we value. --- ### About the Role We're looking for a **Staff Performance Engineer** to own the most latency-critical systems at Helius. These services are responsible for streaming Solana's state changes across our global network and providing real-time data APIs to traders, exchanges, and DeFi protocols. They handle massive throughput, and small optimizations create outsized impact. You'll lead performance strategy, drive cross-team architectural decisions, and dig into the hardest bottlenecks to make our products faster and more efficient. The problems are challenging, the expectations are high, and the improvements you ship will be felt across the Solana ecosystem. --- ### What You'll Do - Set technical direction for performance across Helius' most latency-critical systems, influencing architecture and engineering standards company-wide - Profile, tune, and optimize the low-level Rust services that power traders and financial institutions - Design systems for low-latency environments where microseconds matter - Lead cross-team initiatives to identify and eliminate systemic performance bottlenecks - Own foundational systems end-to-end and keep them simple, reliable, and easy to operate - Mentor engineers and raise the bar on performance engineering and operational rigor --- ### What You'll Bring - 8+ years of systems-level engineering in **Rust** or **C++** - Deep experience tuning high-throughput, latency-sensitive systems - Track record of leading ambiguous, cross-team technical projects and shipping durable systems - Strong intuition for hardware, operating systems, and network performance - Ability to operate with high ownership on difficult technical problems and make decisions legible to stakeholders - A desire to push performance to the limit, not just make it "good enough" --- ### Nice to Have - Experience in trading systems (DeFi or TradFi) - Background in performance-obsessed environments like **Cloudflare**, **Netflix**, or similar --- ### Why Helius? - **High-impact work:** Your code will power applications used by millions across the Solana ecosystem, including Coinbase, Jupiter, and Phantom - **Serious engineering:** Build fast, reliable systems and user experiences across distributed infra and high-throughput backends - **Ownership & growth:** Lead critical initiatives, influence architecture and product direction, and take on more responsibility as the company scales - **Remote-first flexibility:** Work where you’re most effective with a flexible, fully distributed team - **Competitive comp & perks:** Market-leading salary, meaningful equity, generous vacation, wellness budgets, and support for learning and travel - **Mission-driven team:** Join ambitious builders who move fast, take ownership, and are shaping the future of decentralized apps --- *When applying, mention the word **CANDYSHOP** to show you read the job post completely.*
3 days ago
## **Issuance Engineering Lead** ### **About M0** M0 is the shared infrastructure where businesses launch their own branded stablecoins and financial institutions power them. Built on a common standard, every stablecoin on M0 is interoperable and liquid from day one — giving businesses programmable control over how money moves in their ecosystems, and giving financial institutions the most advanced issuance stack in the industry. M0 is seeking an **Issuance Engineering Lead** who will play a fundamental role in shaping the future of our organization. As Issuance Engineering Lead, you will own the smart contract and backend systems that power M0 stablecoin issuance across EVM and non-EVM chains (Solana and others). You will lead and build out the team responsible for making issuance fast, safe, and capital-efficient — from on-chain programs to the backend systems, APIs, and UIs that sit on top of them. The ideal candidate is a self-driven engineering lead with strong ownership instincts and a bias for action, equally comfortable in EVM and non-EVM environments, who brings substantial expertise across blockchain applications and infrastructure and thrives in fast-paced settings. ### **Key Responsibilities** - Build and lead a high-caliber engineering team delivering on-chain programs and backend services. - Architect and ship smart contracts across EVM and non-EVM chains (Solana and others) with a high bar for precision and safety. - Mentor engineers and set the technical direction for the issuance stack. - Drive code and design reviews, raising the quality bar across the team. - Prepare codebases for third-party audits with comprehensive tests, invariants, AI-assisted review, and fuzz testing harnesses. ### **Qualifications** - 7+ years of software engineering experience shipping production DeFi and backend systems. - 2+ years leading engineering teams, or a clear track record suggesting you'll pick it up quickly. - Proven history of deploying and maintaining complex, high-precision on-chain systems in production. - Production experience writing backend systems in Rust. - Solid Solidity and EVM development experience, combined with strong familiarity with the SPL Token program, Token-2022, and Associated Token Accounts. - Experience with cross-chain messaging and bridging protocols — Wormhole NTT, LayerZero, Hyperlane, or Chainlink CCIP. ### **Nice to Have** - Prior experience at a high-growth digital assets company or DeFi protocol — ideally one handling stablecoin issuance, lending, or RWAs. - Experience with security tooling and audit workflows for EVM and non-EVM chains (Solana and others). - AI-curious and fluent — uses modern AI tooling to move faster and ship better. - Open-source contributions to on-chain programs, SDKs, or developer tooling. - Degree in computer science or a related field. ### **Compensation** - Competitive compensation (base salary with equity/token grant) commensurate with experience. ### **Benefits** - **Global team and flexibility:** Join a truly global team with the flexibility to work remotely or from one of our hubs in NYC or Berlin. - **Health and wellness:** Enjoy comprehensive healthcare insurance coverage as well as a wellbeing allowance and gym membership to support your physical and mental health. - **Customizable IT setup:** Tailor your workspace with access to top-notch IT equipment. - **Professional development:** Benefit from an annual development budget to enhance your skills and grow professionally, including opportunities to participate in conferences and on-site company events worldwide. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
3 days ago
```markdown ## About CoW DAO **CoW DAO** is on a mission to protect Ethereum users from MEV and optimize trade execution across DeFi. We achieve this through the CoW Protocol, CoW Swap (a leading intent-based DEX aggregator), and the innovative MEV Blocker, which together help secure, aggregate, and route trades for optimal outcomes. We also fund values-aligned projects via the CoW Grants Program. CoW Protocol is consistently ranked among the top DEX aggregators by monthly volume and is the largest intent-based exchange. Our MEV Blocker protects trades from harmful MEV extraction and is integrated across the Ethereum ecosystem. The CoW AMM is the only live AMM designed to protect liquidity providers from LVR (loss-versus-rebalancing). With over **100 open-source repositories** on GitHub, we're transparent, community-driven, and deeply committed to the open-source ethos. Our real-time Dune Analytics dashboard showcases billions in cumulative trading volume and a rapidly growing user base. As we continue to scale, CoW DAO remains at the forefront of DeFi innovation, prioritizing security, efficiency, and decentralization. Learn more ## About the role *Location: We are a fully remote team, and although we hire almost globally, there is a preference for this role to be based in **Europe or remote +/- 4 hours CEST time*** *Please note* we’re not hiring from the US, Australia, or New Zealand *Position: **Full-time contractor*** We are looking for an enthusiastic, self-motivated, **Senior Backend Engineer** to help us build the next generation of decentralised trading protocols. As a dedicated backend engineer, you will gain ownership of our existing backend services and influence the creation, design, and execution of future features and products. You will work on technically challenging aspects of our off-chain services and our developer-facing APIs and help ensure the delivery of reliable and performant features to improve CoW Protocol. **Our Tech Stack** - **Backend Code:** Rust, Tokio, Cargo, Git (https://github.com/cowprotocol/services) - **Infrastructure:** Pulumi, AWS, Docker, Kubernetes, Grafana, Prometheus, Elasticsearch - **Other codebases:** Typescript, Python, Solidity ## What you will do - Architect and design our off-chain services (core auction protocol as well as the orderbook) to support feature growth and the rapidly changing requirements that come from being an application on a constantly evolving blockchain. - While your focus will be writing concurrent backend systems in Rust, you will also interact with our Smart Contracts written in Solidity and develop your understanding of auction mechanisms and DeFi protocols. - Participate in our on-call rotation to help ensure the reliability of our production systems (**on-call work is additionally compensated**). - Work closely with researchers and the product team to ship features and come up with new solutions for challenging technical problems. - Deliver high-quality code for features from concept until production (including state-of-the-art monitoring of our production systems). - Give thoughtful and in-depth code reviews of your colleagues’ contributions to our open-source codebase. ## Who you are - You have 8+ years of production experience with **systems-level programming languages**, with at least 3+ years of hands-on production experience using **Rust**. - You have **practical experience working in web3** (ideally in DeFi and the Ethereum ecosystem). - You have excellent computer science, programming, and algorithmic skills. - Experience with operating, maintaining, and architecting complex software systems. - You care deeply about the quality, readability, observability, and testability of your code. - You proactively give technical direction to improve performance, prevent issues, optimise data usage, and refactor the codebase. - You are a team player, strong communicator, and gladly share your expertise with others. - You collaborate effectively with a remote-first team on a large, open-source codebase. - Ideally, someone senior who can mentor colleagues and provide direction. - You are excited to explore and gain experience with Ethereum. ## What we can offer you - Flexible work environment: Join our hub in Lisbon or work remotely. - Token plan: Have a stake in our mission and shape the future of CoW DAO. - Periodic gatherings: Enjoy opportunities to connect with the rest of the team through regular trips. - Conference allocation: Stay up-to-date with ecosystem advancements using our conference budget. - Learning budget: Use our learning budget to support your higher ambitions. - Hardware budget: Take advantage of a hardware budget for acquiring necessary equipment. - Make an impact: You are joining a startup where you can make a huge difference. Your work matters! - Flat hierarchies mean fewer processes and bureaucracy - see more of your ideas come to life! - Flexible work and vacation times: Prioritize work-life balance through our robust flexible work policy and vacation allowance. - Growth: If you're someone who loves taking the initiative and getting things done, CoW offers lots of opportunities for your individual growth. ## Referral Program Earn 6.000 USDC or USD with the refer-to-earn program. More details here. ## Culture Life within the CoW DAO is an incredible adventure! We take pride in our collaborative approach, embracing autonomy and fostering a culture of big thinking and continuous growth. We value impact, ownership, simplicity, and team spirit. Plus, we're all about feedback, coming together, and enjoying the journey along the way! **At CoW DAO, we strive to create a space where everyone feels included and empowered. We believe that our products and services benefit from our diverse backgrounds and experiences. All qualified applicants are considered for positions regardless of race, ethnic origin, age, religion or belief, marital status, gender identification, sexual orientation, or physical ability** When applying, mention the word CANDYSHOP to show you read the job post completely. ```
4 days ago
## **Building the Future of Crypto** Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology. **What makes us different?** Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you'll join us on our mission to accelerate the global adoption of crypto, so that everyone can achieve financial freedom and inclusion. For over a decade, Kraken's focus on our mission and crypto ethos has attracted many of the most talented crypto experts in the world. Before you apply, please read the **Kraken Culture** page to learn more about our internal culture, values, and mission. We also expect candidates to familiarize themselves with the Kraken app. Learn how to create a Kraken account here. As a fully remote company, we have Krakenites in 70+ countries who speak over 50 languages. Krakenites are industry pioneers who develop premium crypto products for experienced traders, institutions, and newcomers to the space. Kraken is committed to industry-leading security, crypto education, and world-class client support through our products like Kraken Pro, Desktop, Wallet, and Kraken Futures. **Become a Krakenite and build the future of crypto!** ## **Proof of Work** ## **The Team** Join our Exchange team and start building the internet of money. The Exchange team is responsible for everything to do with the trading backend services such as the matching engine, market data gateways, internal and external APIs, margin systems and various other trading services. The team is located globally and responsibilities are split into sub-teams, working with various tech stacks. Our teams code in **C++**, **Go**, **Rust**, and **Python**, depending on the product they are contributing to within Kraken. This role sits within the Trading Technologies sub-team, which owns the messaging and transport layer at the core of our trading infrastructure — built on **Aeron** for ultra-low-latency, reliable UDP messaging. You'll work directly on the systems that move market data, orders, and trade events across our exchange at microsecond scale. ## **The Opportunity** - Develop and maintain core framework and key software components for the Kraken trading engine, with a focus on the Aeron-based messaging transport layer - Design and implement low-latency, high-availability messaging solutions across unicast, multicast, and IPC transport paths - Tune and profile the full system stack — CPU pinning, NUMA topology, kernel bypass, receive buffer sizing — to squeeze latency out of production infrastructure - Build and extend Aeron Archive integrations for durable message replay and stream persistence - Build and design solutions that mitigate risk, implement security, and protect both systems and data - Write reusable, testable, and efficient code - Collaborate with cross-functional teams and contribute to product roadmap accomplishment - Work collaboratively on a distributed team, leveraging soft skills to effectively communicate and engage with stakeholders ## **Skills You Should HODL** - 5+ years experience working with modern **C++** - Prior experience in at least one of the following using **Linux** — distributed and/or highly-concurrent systems; low-latency and/or high-volume transaction environments - Deep understanding of low-latency systems fundamentals: lock-free data structures, mechanical sympathy, cache-line discipline, busy-spin vs. park/wake tradeoffs - Experience with **Aeron** or comparable messaging transports (e.g. Chronicle Queue, ZeroMQ, LMAX Disruptor) highly desirable - Experience with UDP networking, multicast, and kernel-bypass techniques (e.g. DPDK, RDMA) a strong plus - Familiarity with SBE (Simple Binary Encoding) or similar zero-copy serialization formats a plus - Experience profiling and optimizing code (CPU, memory, network) — perf, flamegraphs, VTune, or equivalent - High level of proficiency in **Python**, **Rust**, and **SQL** strongly preferred - Demonstrated knowledge of order types, trading systems, and financial products is highly desirable - Cryptocurrency/Blockchain familiarity highly preferable - Proactive mindset with the ability to both prioritize tasks and adhere to aggressive deadlines - BS in a technical or quantitative field --- *Unless a specific application deadline is stated in the job posting, applications are accepted on an ongoing basis.* *Please note, applicants are permitted to redact or remove information on their resume that identifies age, date of birth, or dates of attendance at or graduation from an educational institution.* *We consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.* Kraken is powered by people from around the world and we celebrate all Krakenites for their diverse talents, backgrounds, contributions and unique perspectives. We hire strictly based on merit, meaning we seek out the candidates with the right abilities, knowledge, and skills considered the most suitable for the job. We encourage you to apply for roles where you don't fully meet the listed requirements, especially if you're passionate or knowledgeable about crypto! We may ask candidates to complete job-related skills or work assessments. As an equal opportunity employer, we don't tolerate discrimination or harassment of any kind. Whether that's based on race, ethnicity, age, gender identity, citizenship, religion, sexual orientation, disability, pregnancy, veteran status or any other protected characteristic as outlined by federal, state or local laws. ## **Stay in the Know** - Follow us on Twitter - Learn on the Kraken Blog - Connect on LinkedIn - Candidate Privacy Notice *When applying, mention the word **CANDYSHOP** to show you read the job post completely.*
5 days ago
## **Senior Software Engineer, Trusted Platform** **Fireblocks** Founded in 2018 and already valued at over $8 billion, Fireblocks is a SaaS platform that helps companies create innovative products on the blockchain and manage day-to-day crypto operations. Fireblocks is trusted by some of the largest financial institutions, banks, globally-recognized brands, and Web3 companies in the world, including BNY Mellon, BNP Paribas, ANZ Bank, Revolut, and thousands more, to securely scale digital asset operations through the Fireblocks Network and MPC-based wallet infrastructure. We have offices in New York, London, Tel Aviv, and Singapore, and we are continuing to expand our teams to reach new customers globally. ### Job Summary We’re looking for a **Senior Software Engineer** to join our **Core Infrastructure** team. In this role, you will be responsible for designing and implementing core components crucial to the product's scalability. As part of your role, you will be expected to find creative solutions to various architectural and implementation challenges, designing and executing solutions for a unique set of problems we encounter as a state-of-the-art technical product. You will be expected to take full ownership of your work — from initial design and implementation through to deployment and production support. You drive features end-to-end, see them through to completion, and take responsibility for their success. ### Requirements - Strong coding skills in **C++/Rust** (at least 4 years) - Ability to explore new areas independently, and propose and implement well-thought-out solutions - An excellent team player - **Python** — advantage - Experience working on a high-scale distributed system — big advantage - Experience with blockchain or cryptography — big advantage If you are an innovative developer with self-learning skills, who likes to research new technologies, and you're passionate about engineering and solving hard problems – come and join us! --- *Fireblocks' mission is to enable every business to easily and securely access digital assets and cryptocurrencies. In order to do that, we strongly believe our workforce should be as diverse as our clients, and this is why we embrace diversity and inclusion in all its forms.* *Please see our candidate privacy policy here.* When applying, mention the word **CANDYSHOP** to show you read the job post completely.
6 days ago
## What You’ll Do You will help design, build, and operate core components of a stablecoin product, spanning on-chain smart contracts and off-chain services that ensure peg stability, liquidity, and secure payments. Working closely with product, research, and security teams, you’ll own features end-to-end—from architecture and implementation to observability and incident response. - Build and maintain smart contracts and on-chain components (Solidity, Rust, etc.) for stablecoin issuance, redemption, and peg mechanics. - Develop and scale off-chain services (backends, payment rails, oracles) that interact with blockchains and external liquidity providers. - Implement robust monitoring, alerting, and automated recovery for financial systems handling real funds. - Collaborate with cryptography, research, and security teams to implement secure protocols and threat mitigations. - Participate in design reviews, code reviews, and post-incident blameless retrospectives. - Contribute to developer tooling, testing frameworks, and CI/CD pipelines focused on blockchain deployments. ## Core Qualifications (Required) - 3+ years building production-grade backend or distributed systems (or equivalent experience in blockchain infrastructure). - Hands-on experience with smart contract development or strong understanding of smart-contract architecture (Solidity, Vyper, Rust, or similar). - Proficiency with at least one backend language (Go, Rust, Python, Node.js, Java) and experience integrating with blockchain nodes / RPCs. - Strong software engineering fundamentals: system design, testing, observability, and debugging at scale. - Solid understanding of cryptography basics, consensus mechanics, and DeFi primitives relevant to stablecoins. - Experience with secure coding practices and performing/participating in security audits. - Excellent communication skills and ability to work cross-functionally. ## Preferred Qualifications - Prior experience launching or maintaining a stablecoin, payments platform, or other production crypto-financial product. - Familiarity with oracle design, liquidity management, risk modelling, or peg stabilization mechanisms. - Experience with Layer 2 solutions, cross-chain bridges, or interoperability tooling. - Background in formal verification, fuzz testing, or running smart contract audits. - Familiarity with cloud infrastructure (AWS/GCP), containerization (Docker/Kubernetes), and infra-as-code. - Contributions to open-source blockchain projects or published research in crypto/DeFi. ## Skills & Tools - **Smart contracts:** Solidity, Rust (Ink/Anchor), Vyper - **Backend:** Go, Rust, Python, Node.js, Java - **Blockchain tooling:** Hardhat, Truffle, Foundry, ethers.js, web3.py - **Databases & caches:** Postgres, Redis - **Observability:** Prometheus, Grafana, Sentry - **CI/CD & infra:** GitHub Actions, Terraform, Docker, Kubernetes - **Security & testing:** unit/integration tests, fuzzing, static analysis, audit processes ## How to Apply Submit your resume and a brief cover letter highlighting relevant stablecoin or blockchain experience. Applicants may be asked to complete a technical assessment or share public code samples. CareerTakes may provide additional matched opportunities if you qualify. When applying, mention the word **CANDYSHOP** to show you read the job post completely. ## Equal Opportunity & Hiring Transparency CareerTakes and our client are Equal Opportunity Employers committed to building a diverse and inclusive workforce. We prohibit discrimination or harassment of any kind. To support a fair and efficient hiring process, **AI tools may be used** to assist with application review or resume screening. These tools **do not replace human decision-making**. Final hiring decisions are made by people.
9 days ago
## BYTE Protocol **BYTE Protocol** is the per-byte data settlement layer for the agentic economy, built on Arbitrum. Publishers stake PPB tokens, broadcast data feeds, and earn USDC per KB. AI agents pay per kilobyte via MCP or x402. Quality is enforced entirely on-chain through a Proof-of-Quality Score (PQS) — computed from disputes, retention, and freshness — with progressive slashing for bad actors (5%→10%→25%+suspension→100%+ban) and up to 70% take rate for top-tier publishers. No arbitration committee. No trusted intermediary. The protocol enforces it. **BYTEDev Inc.** is the Delaware C-Corp behind the protocol. We are pre-mainnet and pre-funding, with 20 contracts live on Arbitrum Sepolia, 533 tests passing, and agents already settling on testnet. --- ## The Role The protocol is built. What comes next is the hardest part: getting it to mainnet safely. This is a co-founder role. You will own the path from working testnet to audited, production-grade protocol — leading the external security audit, hardening the contracts, and shaping the technical roadmap from here forward. You'll work directly with the founder, have real ownership in the company, and be the technical voice to auditors, investors, and the builder community. --- ## What You'll Own - Lead the external security audit end-to-end — firm selection (Trail of Bits, OpenZeppelin, Spearbit, or your recommendation), scope definition, remediation, and sign-off - Identify and close attack vectors the existing test suite doesn't cover — reentrancy, flash loan manipulation, MEV, oracle gaming, access control edge cases - Architect v0.6+ contracts alongside the founder — commit-reveal PQS, validator tiering, governance activation - Design and maintain a robust security architecture across the full stack: on-chain contracts, Rust indexer, TypeScript agent tooling, and x402 gateway - Drive strategic IT and infrastructure decisions as the protocol scales toward mainnet and beyond - Oversee technical execution, manage high-stakes timelines, and contribute to the protocol's long-term roadmap from both a technical and business perspective --- ## What's Already Built You are not walking into a whitepaper. You are walking into a working protocol: - 20 Solidity contracts: PPBToken, DataStream, ReputationEngine (v0.5), PQSVerifier, OracleConsensus, ValidatorRegistry, ArbitrationController, DividendPool, BurnEngine, and more - Rust indexer + libp2p relay network, fully synced on Arbitrum Sepolia - TypeScript autonomous validator agent (open-source, live on npm) - MCP server — byte-mcp-server@0.3.0, 13 tools, agent-native - x402 payment gateway - Next.js marketplace UI (Mercat) - Pre-audit baseline: Slither clean, Mythril clean across 8 core contracts --- ## Qualifications **Required:** - Deep Solidity security expertise — you have found bugs in production contracts, not just written them - Hands-on experience coordinating or participating in formal smart contract audits - Strong software architecture fundamentals — able to design and scale complex, distributed systems - Proficiency in blockchain-specific security: EVM attack vectors, economic exploits, cross-contract risk - Experience with Ethereum or Layer 2 solutions, ideally Arbitrum - Comfortable reading and writing Rust and TypeScript — the off-chain stack is not optional here - Strong project management instincts — you can own a timeline, identify risk early, and ship under pressure - Excellent critical thinking and communication skills — you'll be the technical voice to auditors, investors, and external partners **Strongly preferred:** - Prior experience at a security firm (Trail of Bits, Spearbit, Code4rena, Sherlock) or a DeFi protocol that shipped to mainnet - Opinions on mechanism design — slashing schedules, commit-reveal schemes, stake economics - Familiarity with web3, agent-driven ecosystems, or AI infrastructure - Background in Computer Science, Engineering, or equivalent technical field --- ## Why Now The x402 Foundation (Coinbase, Cloudflare, Google, Visa, Anthropic, Vercel) standardized agent payment rails in 2025. MCP is the universal agent tool interface. BYTE was designed for both from day one. The market is forming now — the window for the first-mover data marketplace is open and won't stay open. The audit is the gate. Mainnet is the unlock. This role exists to get us through it. --- ## Compensation Equity-first co-founder role. Comp details are discussed directly and honestly — structure depends on funding stage and what you need. If you need a salary to operate, we will have that conversation openly. --- ## To Apply DM Mark Zhurbin on LinkedIn or X (@NotMarkZ) with two things: what you've audited or broken, and why this problem is worth your time. No cover letter needed. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
9 days ago
## About Polymarket **Polymarket** is the world's largest prediction market platform. We enable individuals to express views on real-world events by trading on outcomes across politics, economics, sports, culture, and current affairs. Built as a peer-to-peer marketplace with no centralized "house," Polymarket aggregates diverse opinions into transparent, market-based probabilities that reflect collective expectations about the future. We're growing fast, both in terms of volume ($21B traded in 2025) and adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media and we need your help adding fuel to the fire. ## About the Role Polymarket is looking for a **Senior Backend Engineer** to join our **DeFi Trading team** and own core improvements to our exchange systems. You'll work across low-latency APIs, high-throughput data streams, and settlement-aware order state, with a specific focus on evolving our CLOB engine to be faster, safer, and more concurrent as the platform scales. This role requires someone who can reason clearly about how on-chain transaction lifecycle, confirmations, reorgs, balances, approvals, and execution outcomes affect off-chain exchange state. The problems are deep, the stakes are real, and the work will be immediately visible in production. ## What You'll Do - **Own the CLOB engine's critical path.** Profile matching and orderbook hot paths, map settlement-sensitive state transitions, and drive improvements to latency, throughput, and async engine flow backed by benchmarks and production-grade evidence. - **Reduce lock contention without breaking correctness.** Debug concurrency issues, design safer queueing and backpressure for orderbooks, and improve the system's ability to handle materially more markets and order flow with lower tail latency. - **Build for observability and safety.** Instrument improvements with pprof, metrics, logs, and traces. Establish rollback guarantees and narrower critical paths that make production incidents easier to detect, diagnose, and resolve. - **Reason about settlement risk.** Understand how on-chain transaction effects ripple into off-chain exchange state, and design systems that handle crossed books, ghost fills, stale orders, cancel inconsistencies, and settlement edge cases correctly. - **Improve the runtime.** Reduce GC pressure, optimize CPU and memory allocation behavior, and push Go runtime performance to meet the demands of a high-throughput exchange at scale. - **Debug production incidents.** Own latency, correctness, and settlement-state incidents end-to-end, and drive follow-through that leaves the system measurably better each time. ## What We're Looking For - Production experience building low-latency backend systems at scale - Strong concurrency skills and a track record debugging lock contention, race conditions, and async correctness issues - Fluency in production **Go** and **Rust** - Deep observability experience: pprof, metrics, logs, and distributed traces - Experience with exchange systems that interact with EVM or blockchain settlement layers - Strong computer science fundamentals: algorithms, data structures, concurrency, and profiling - (Plus) Direct experience with matching engines or exchange infrastructure - (Plus) EVM transaction lifecycle experience: confirmations, reorgs, and how on-chain state affects off-chain systems - (Plus) Go runtime and GC tuning experience - (Plus) Experience with **Redis**, **PostgreSQL**, **gRPC**, and **Protobuf** - (Plus) **Kubernetes** and **AWS** production operations experience ## Benefits - Competitive salary & equity - Unlimited PTO - Full Health, Vision, & Dental coverage - 401k match - Hardware setup: new MacBook Pro, big display, & accessories When applying, mention the word CANDYSHOP to show you read the job post completely.
9 days ago
## **Building the Future of Crypto** Our Krakenites are a world-class team with crypto conviction, united by our desire to discover and unlock the potential of crypto and blockchain technology. ### **What makes us different?** Kraken is a mission-focused company rooted in crypto values. As a Krakenite, you'll join us on our mission to accelerate the global adoption of crypto, so that everyone can achieve financial freedom and inclusion. For over a decade, Kraken's focus on our mission and crypto ethos has attracted many of the most talented crypto experts in the world. Before you apply, please read the **Kraken Culture** page to learn more about our internal culture, values, and mission. We also expect candidates to familiarize themselves with the Kraken app. Learn how to create a Kraken account here. As a fully remote company, we have Krakenites in 70+ countries who speak over 50 languages. Krakenites are industry pioneers who develop premium crypto products for experienced traders, institutions, and newcomers to the space. Kraken is committed to industry-leading security, crypto education, and world-class client support through our products like Kraken Pro, Desktop, Wallet, and Kraken Futures. **Become a Krakenite and build the future of crypto!** ### Proof of Work ### The Team The Pro team is responsible for everything to do with the trading backend services such as the matching engine, market data gateways, internal and external APIs, and various other trading services. The team is located globally and responsibilities are split into sub-teams, working with various tech stacks. Our teams code in Rust and work agile around the globe. Recently, the team played a critical role in scaling Kraken's trading infrastructure. ### The Opportunity - Create comprehensive test plans before feature development, defining manual and automated testing strategies. - Perform hands-on manual testing during development cycles to validate new features before automation. - Balance manual exploratory testing with automation to catch edge cases that scripts might miss. - Collaborate with engineers, product managers, and designers to define QA processes for a mission-critical trading platform. - Lead automation initiatives end-to-end: strategy, implementation, CI/CD integration, and scaling coverage. - Drive performance, security, and accessibility testing to deliver a top-tier experience for traders. - Proactively document, report, and triage bugs to improve release quality and velocity. ### Skills You Should HODL - Strong programming skills in Python, Rust, or another automation-oriented language. - Trading knowledge and experience – understanding of order types, trade execution, margin trading, and general financial markets (we'll support deepening your expertise, but foundational knowledge is essential). - Proven ability to design comprehensive test plans before implementation, identifying what should be manually tested vs. automated. - Experience designing, implementing, and maintaining test automation frameworks on complex applications. - Strong manual testing skills and ability to think creatively to uncover edge cases and unexpected bugs. - Solid understanding of QA principles, including exploratory testing, regression testing, and bug tracking. - Comfort with CI/CD integration and automation at scale. - Detail-oriented mindset with a passion for building high-quality software and ability to think outside the box. --- *Unless a specific application deadline is stated in the job posting, applications are accepted on an ongoing basis.* *Please note, applicants are permitted to redact or remove information on their resume that identifies age, date of birth, or dates of attendance at or graduation from an educational institution.* *We consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.* Kraken is powered by people from around the world and we celebrate all Krakenites for their diverse talents, backgrounds, contributions and unique perspectives. We hire strictly based on merit, meaning we seek out the candidates with the right abilities, knowledge, and skills considered the most suitable for the job. We encourage you to apply for roles where you don't fully meet the listed requirements, especially if you're passionate or knowledgeable about crypto! We may ask candidates to complete job-related skills or work samples. As an equal opportunity employer, we don't tolerate discrimination or harassment of any kind. Whether that's based on race, ethnicity, age, gender identity, citizenship, religion, sexual orientation, disability, pregnancy, veteran status or any other protected characteristic as outlined by federal, state or local laws. ### Stay in the know - Follow us on Twitter - Learn on the Kraken Blog - Connect on LinkedIn - Candidate Privacy Notice When applying, mention the word **CANDYSHOP** to show you read the job post completely.