Java Jobs
85 jobs found
Coins.ph
4 days ago
## QA Engineer-PH **Location:** Taguig City, Metro Manila, Philippines **Department:** Technology – Quality Assurance **Employment Type:** Full-time Employee **Workplace Type:** Hybrid --- ### Join the Pioneer Crypto Brand in the Philippines! Coins is the most established crypto brand in The Philippines and has gained the trust of more than 18 million users. Through the easy-to-use mobile app, users can buy and sell a variety of different cryptocurrencies and access a wide range of financial services. Coins is fully regulated by the Bangko Sentral ng Pilipinas (BSP) and is the first ever crypto-based company in Asia to hold both Virtual Currency and Electronic Money Issuer licenses from a central bank. --- ### Responsibilities - Responsible for **business testing** of payment systems, accounts, transactions, merchant backends and other products, including test case design, execution, defect tracking and regression verification. - Participate in requirement and solution reviews, identify business risks, and ensure product quality and launch stability. - Perform interface and functional testing, assist in locating production issues, and drive issue closure. - Support **automation testing**, develop and maintain automated scripts to improve regression efficiency. --- ### Requirements - 5+ years of software testing experience, familiar with the full testing lifecycle. - Solid **business testing** capability, able to independently design and execute test cases for complex scenarios. - Experience in **interface/UI automation testing**, with basic **coding skills** (Python/Java preferred). - Proficient in SQL, clear logical thinking, strong sense of responsibility. - **Background in payment, finance or transaction industry is a plus.** --- ### Join the Coins Team Now! **Meaningful Collaborations** – The successful candidate will work cross-functionally with other relevant teams to carry out implementations that will improve and create an impact on customer experience. **Scalable Growth** – Be part of a fast-growing organization with the vision to expand its territories outside APAC which will provide opportunities for career advancement. **A Space For Bright Ideas** – Let your bright ideas be converted into meaningful changes! Coins culture welcomes new ideas backed up by data to create an impact. --- *We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.* When applying, mention the word **CANDYSHOP** to show you read the job post completely.
6 days ago
```markdown # Backend Engineer - Payment (Java) **Location:** Asia / Taiwan, Taipei / Hong Kong **Department:** Engineering – Backend **Commitment:** Full-time Onsite or Remote **Workplace Type:** Remote --- ## About Binance Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries for our industry-leading security, user fund transparency, trading engine speed, deep liquidity, and an unmatched portfolio of digital-asset products. Binance offerings range from trading and finance to education, research, payments, institutional services, Web3 features, and more. We leverage the power of digital assets and blockchain to build an inclusive financial ecosystem to advance the freedom of money and improve financial access for people around the world. Are you ready to revolutionize the way people transact and manage their finances? Our Payments team is on a mission to transform digital payments with our cutting-edge crypto payment solutions. Join us and be part of a dynamic team that's driving the future of financial technology, making crypto transactions seamless and accessible for everyone. --- ## Responsibilities - Development and implementation of financial products including but not limited to the wallet, payment gateway, cash rebate, and merchant management - Build open API features for core financial products - Communicate effectively with product managers to design and implement product features that support the payment system - Performance tuning, online incident troubleshooting, and system refactoring - Write high-quality, clean, and maintainable code using engineering best practices --- ## Minimum Qualifications - Bachelor's/Master's degree in computer science, engineering, or equivalent industry experience - 3–6 years of work experience - Proficient in **Core Java** and familiar with the **Spring Framework** - Proficient in **MySQL** and familiar with at least one NoSQL database - Proficient in distributed system design, and familiar with at least one messaging middleware and its underlying design principles - Good cross-team communication skills - **Bilingual in English and Mandarin** is required to coordinate with overseas partners and stakeholders --- ## Preferred Qualifications - Proficient in **Spring Cloud** and microservice design - Related domain experience in the **Fin-Tech industry** - Experience or interest in developing backends, APIs, libraries, and SDKs - Performance tuning experience on JVM, SQL, RPC, etc. - Global team management experience --- ## Why Binance - Shape the future with the world’s leading blockchain ecosystem - Collaborate with world-class talent in a user-centric global organization with a flat structure - Tackle unique, fast-paced projects with autonomy in an innovative environment - Thrive in a results-driven workplace with opportunities for career growth and continuous learning - Competitive salary and company benefits - Work-from-home arrangement (the arrangement may vary depending on the work nature of the business team) Binance is committed to being an equal opportunity employer. We believe that having a diverse workforce is fundamental to our success. *By submitting a job application, you confirm that you have read and agree to our **Candidate Privacy Notice**.* --- *We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.* --- **When applying, mention the word CANDYSHOP to show you read the job post completely.** ```
Chainalysis
9 days ago
## About Chainalysis Blockchain technology is powering a growing wave of innovation. Businesses and governments around the world are using blockchains to make banking more efficient, connect with their customers, and investigate criminal cases. As adoption of blockchain technology grows, more and more organizations seek access to all this ecosystem has to offer. That's where Chainalysis comes in. We provide complete knowledge of what's happening on blockchains through our data, services, and solutions. With Chainalysis, organizations can navigate blockchains safely and with confidence. ## About the Team **Product Security** at Chainalysis keeps our SaaS platform — used by governments, banks, and crypto exchanges to investigate financial crime — secure by design. We partner directly with product and platform engineering on threat modeling, design reviews, penetration testing, and remediation of findings across our AWS and Kubernetes estate. As a **Staff Product Security Engineer**, you'll be the technical lead for product security across one or more product areas. You'll run security reviews for new launches and AI tooling, perform hands-on pentests, ship code and fixes directly into product repos, own our Vulnerability Disclosure Program, and drive SOC2 and risk-framework work across R&D. You'll participate in a shared on-call rotation for production security incidents. ## In this role, you'll: - Lead Product Security across Chainalysis' SaaS offerings, partnering with product and platform engineering teams on design, code, and remediation - Own Unified Security Review process for new product launches, vendor evaluations, and AI tooling — including custom penetration tests scoped to each review - Drive Security Engineering Risk Management Framework, for consistent risk classification and remediation tracking across product - Lead the Vulnerability Disclosure Program and security bug reporting workflow, from researcher intake through fix - Drive SOC2 and compliance-related security remediation across product engineering, partnering with R&D leads on architectural fixes - Provide security review and guardrails for internal AI platforms and coding agents (LLM gateways, prompt/response controls, agent permissioning) - Participate in a shared on-call rotation for high-severity production security incidents ## We're looking for candidates who have: - 8+ years of application security engineering experience - Strong production coding ability in at least one of **Java** (preferred), **TypeScript/JavaScript**, **Python**, or **Go** — enough to perform deep code review, write proof-of-concept exploits, and contribute fixes directly into product repos - Building security automation into CI/CD pipelines - Hands-on penetration testing of production SaaS applications, including custom tests scoped to new product launches - Threat modeling, secure design reviews, and static/dynamic code analysis across the SDLC - Identifying and remediating common web application vulnerabilities (OWASP Top 10) - Experience securing internal AI/LLM platforms and coding agents (model gateways, prompt/response controls, agent permissioning) ## Nice to have experience: - Experience in **Web3**, **Blockchain**, or **Digital Assets** - Experience building AI workflows, agents, and guardrailing ## Technologies we use: - **Cloud and containers:** AWS, GCP, Kubernetes (EKS/GKE) - **Infrastructure-as-Code:** Terraform - **Security tooling:** Wiz, SonarCloud, Burp, Cloudflare - **CI/CD and source control:** GitHub, GitHub Actions, Artifactory and related build/deploy tooling - **Languages and scripting:** Java, JavaScript, Python, Go - **AI Coding Agents, Tooling, Systems** ## About Chainalysis Blockchain technology is powering a growing wave of innovation. Businesses and governments around the world are using blockchains to make banking more efficient, connect with their customers, and investigate criminal cases. As adoption of blockchain technology grows, more and more organizations seek access to all this ecosystem has to offer. That's where Chainalysis comes in. We provide complete knowledge of what's happening on blockchains through our data, services, and solutions. With Chainalysis, organizations can navigate blockchains safely and with confidence. ## You belong here. At Chainalysis, we believe that diversity of experience and thought makes us stronger. With both customers and employees around the world, we are committed to ensuring our team reflects the unique communities around us. We're ensuring we keep learning by committing to continually revisit and reevaluate our diversity culture. We encourage applicants across any race, ethnicity, gender/gender expression, age, spirituality, ability, experience and more. If you need any accommodations to make our interview process more accessible to you due to a disability, don't hesitate to let us know. You can learn more here. We can't wait to meet you. *When applying, mention the word **CANDYSHOP** to show you read the job post completely.*
Localcoin
11 days ago
## **ABOUT US** **Localcoin**, founded in 2017 with headquarters in Toronto, is on a mission to simplify the process and experience of buying or selling digital currencies globally. We envision bringing digital currency to the mainstream financial market through partnerships with leading corporate and franchised retail spaces. With terminals across Canada and Australia, Localcoin is now the largest Bitcoin ATM provider in Canada. At its core, Localcoin believes that everyone should be able to own cryptocurrency and have a deep understanding of blockchain technology. As a member of our rapidly growing team, you'll join a talented, dynamic group of team members who will encourage you to learn, grow and thrive in your career every step of the way. If you're a self-starter looking to hone your skills in a startup environment that fosters innovation, transparency and team connectivity, we look forward to hearing from you! ## **THE ROLE** Localcoin seeks to inspire the future of digital currency globally as the largest bitcoin ATM network in Canada. We are looking for an individual who is passionate about learning new technologies to join our growing Engineering team as our **Java Back End Developer**. As a **Java Back-End Developer** at Localcoin, you will be responsible for developing and maintaining functional and stable back end applications for our company, ensuring system consistency and availability. Working alongside the Engineering team, you should have an unyielding desire to learn and broaden your horizon along with contributing towards daily deliverables. You should be a team player, familiar with the Agile framework of delivery. ## **WHAT YOU'LL BE DOING** - Work with our cryptocurrency ATM backend server which connects over 200 machines to the network - Create, improve, and maintain high availability systems for cryptocurrency ATM network and online products such as: Know Your Client (KYC) identification verification software and transaction monitoring systems - Add software integrations with various Blockchain based networks and providers - Implement new features on the cryptocurrency ATM network such as: new cryptocurrency offerings, marketing campaigns, user experience features and more - Make data available from specific internal systems to client systems through distributed cloud environment ## **WHAT WE'RE LOOKING FOR** - 5+ years in backend development and strong knowledge in Java 8 along with Maven or Gradle - In-depth experience with Spring framework, including Spring Boot, JPA, MVC and Spring Security for building RESTful services - Experience with functional testing, unit testing, code coverage and static code analysis tools such as Sonar - Experience with BDD and related tools - Strong proficiency in SQL, DDL, DML, relational database design and indexing in any well known SQL databases such as MySQL, Postgres, Oracle DB, MSSQL - Proficient in Git flow, Maven, NGINX and Docker ## **THIS IS NICE (Preferred Skills)** - Experience with any CI/CD platforms on the cloud - Expertise on Linux platforms and shell commands - Good understanding of cloud environments like AWS/GCP - Good understanding of Cloudflare platform - Expertise using Swagger and/or Postman tools - Experience with NodeJS and NPM management - Experience with AngularJS/Angular - Expertise on Python scripting - Good understanding about asymmetric/symmetric encryption with OpenSSL - Good understanding about database-migration tools such as Flyway - Experience with manual automation tools such as Integromat ## **WHAT YOU'LL LOVE ABOUT US** - Competitive Salary - Health & Wellness Benefits - Hybrid & Flexible Office Environment - Professional Development - Standups, Demos and Monthly Socials to keep us aligned and connected - And so much more! *Localcoin is committed to building a team that represents a variety of backgrounds, perspectives and skills. The more inclusive and diverse we are, the more our work will improve. If you're determined and great at what you do, come as you are.* *If you require accommodation at any stage throughout the recruitment process, please notify your talent team or send an email to careers@localcoinatm.com.* When applying, mention the word **CANDYSHOP** to show you read the job post completely.
Polymarket
11 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 **Lead Android Engineer** to own our Android product as we invest seriously in mobile. We're not looking for another individual contributor: we need someone who can take full ownership of the Android side of Polymarket, lead and organize a team of engineers and contractors, and scale it as the platform grows. The right person brings strong Android expertise alongside the business judgment and cross-functional instincts to translate company goals into a great product. You'll work closely with product, design, and engineering leadership, and you'll be expected to have opinions not just about how things are built, but about what should be built and why. We move fast, priorities shift, and we need someone who thrives in a lean, high-ownership environment and knows how to bring others along with them. ## What You'll Do - **Own the Android product.** Take end-to-end ownership of Polymarket's Android experience, from technical architecture to product quality and roadmap execution. - **Lead and grow the team.** Manage and organize a team of engineers and contractors today, with a clear path to scaling as mobile becomes an increasingly central part of the business. - **Set the technical direction.** Make and own architectural decisions for the Android platform, ensuring the product is built to scale and maintained with discipline. - **Bridge business and technology.** Understand Polymarket's business goals deeply and translate them into technical strategy and prioritization. Be the person in the room who can connect what the company needs to what the Android team builds. - **Partner across the company.** Work closely with product, design, backend, and leadership teams to align on priorities, coordinate launches, and drive quality outcomes. - **Raise the bar.** Establish strong engineering and product standards for the Android team, including code review practices, release processes, and a culture of high ownership. ## What We're Looking For - Significant experience leading Android development at a product-driven company, with ownership over a shipped, high-quality Android app - Comfortable operating in a small, early-stage team environment where context shifts quickly and ownership is broad - Strong business and product judgment: you understand goals beyond the technical and can make tradeoffs that reflect what actually matters to the company - Experience managing engineers and contractors, with a track record of organizing and developing a high-performing team - Deep Android platform expertise and a strong grasp of Android-specific design patterns and constraints - Excellent cross-functional communication skills: you work well with product, design, and non-technical stakeholders - A leadership mindset over an execution mindset: you're motivated by owning an area and scaling it, not just shipping features - (Plus) Experience in fintech, crypto, trading, or other fast-paced, data-rich consumer applications - (Plus) Familiarity with blockchain or Web3 products ## 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.*
Technogen, Inc.
12 days ago
## Role: **Blockchain Architect** ## Location: **Charlotte, NC** ## Description We are seeking a **Senior Architect** to join our Architecture group within the DTI. As a senior technical leader, you will leverage your deep domain expertise and strategic thinking skills to define, guide, and advance enterprise and platform architectures. Your role will involve designing scalable, secure, and resilient solutions across complex, multi-system environments while influencing technology direction beyond a single product or team. ### Responsibilities - Lead architectural initiatives for blockchain-enabled solutions, including tokenized deposits, digital assets, and distributed settlement use cases, ensuring alignment with bank-grade security, resiliency, and regulatory standards. - Design hybrid architectures that integrate distributed ledger platforms with core banking systems, payment platforms, data stores, and event-driven microservices. - Define on-chain vs. off-chain responsibilities, including smart contracts, orchestration services, API layers, and operational controls. - Evaluate and guide the use of permissioned distributed ledger technologies, identity and access models, privacy architectures, and governance structures suitable for regulated environments. - Provide architectural leadership on smart contract concepts, focusing on deterministic business rule enforcement rather than workflow orchestration. - Collaborate with cross-functional teams in payments, liquidity, settlements, or financial market infrastructures within large-scale enterprises. - Establish architectural guardrails and best practices for emerging digital asset and blockchain capabilities to ensure long-term interoperability and maintainability, avoiding vendor lock-in. - Provide thought leadership to engineering teams and stakeholders on the business value of blockchain versus traditional platforms. ### Qualifications - Bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field. Advanced degree preferred. - Minimum of 10 years of experience in architecture roles, with a focus on blockchain, distributed ledger technologies, or financial market infrastructures. - Proven mastery of architectural patterns, cloud and modern engineering practices, and non-functional requirements such as performance, resiliency, and security. - Experience translating business strategy into technical direction and leading cross-functional alignment. - Demonstrated ability to mentor architects and engineers and drive architectural consistency and innovation. - Strong understanding of regulatory and compliance requirements within financial institutions. - Excellent communication and leadership skills, with the ability to advise senior leadership. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
## Hiring Now: Fireblocks Implementation Specialist – Blockchain Infrastructure Engineer **Locations:** Dallas, TX / San Francisco, CA (Remote/Hybrid) **Contract Opportunity | Multiple Openings** We are looking for senior engineers with strong experience in **Fireblocks, HSM/MPC-based signing infrastructure, and large-scale blockchain application design** to support enterprise-grade digital asset custody and transaction platforms. This is a highly technical backend/infrastructure-focused role — ideal for candidates with experience building secure blockchain systems in production environments. ### Core Requirements - Hands-on experience with **Fireblocks APIs, SDKs, and webhooks** - Strong understanding of **HSM-based signing** and secure key management - Experience implementing **MPC (Multi-Party Computation)** workflows - Proven ability to design and support **large-scale blockchain applications** - Strong backend engineering skills in **Java, Python, Node.js, or Go** - Experience with REST APIs, microservices, and distributed systems - Deep understanding of blockchain transaction lifecycle (Bitcoin / Ethereum) - Experience with AWS, Docker, Kubernetes, CI/CD pipelines ### Key Responsibilities - Build and support secure digital asset custody infrastructure - Develop wallet management and transaction orchestration services - Implement secure signing workflows and approval policies - Design scalable blockchain transaction systems with high availability - Troubleshoot production blockchain transaction and API integration issues - Collaborate with DevOps, Security, and Product teams on enterprise deployments - Support compliance and audit processes (SOC 2, ISO 27001, PCI) ### Preferred Background - Crypto exchanges / fintech / digital asset custody platforms - Fireblocks, BitGo, Coinbase Custody, MPC infrastructure - Blockchain infrastructure engineering - High-throughput transaction systems - Smart contracts / Solidity exposure ### Important This role requires deep backend and blockchain infrastructure experience. Candidates with only frontend Web3 or basic dApp development experience may not be the right fit. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
Henderson Scott
16 days ago
## Blockchain / Web3 Engineers – Multiple Openings | New York | $100k–$140k We’re supporting a major enterprise digital assets / blockchain transformation programme and are hiring across multiple blockchain engineering disciplines. This is an opportunity to work on large-scale blockchain-enabled platforms within a production-grade enterprise environment, building secure, scalable systems that integrate distributed ledger technology into real-world financial products. We’re interested in professionals from backgrounds including: ### Blockchain / Web3 Engineering - Smart contract development (Solidity / Vyper) - EVM ecosystems (Ethereum / Polygon / Arbitrum / Optimism / BSC) - Web3 SDK integration - Transaction orchestration, wallet/signature flows, gas optimisation - Node infrastructure / RPC / validator operations ### Backend Blockchain Engineering - Java (8+) / Spring Boot / Spring Cloud - Distributed systems / microservices - REST / gRPC APIs - Kafka / RabbitMQ / event-driven architecture - Blockchain integrations (Ethereum / Hyperledger / Corda / Quorum) - On-chain / off-chain synchronisation ### Blockchain QA / Testing - Smart contract testing - Blockchain transaction validation - API / integration testing - Hardhat / Foundry / Ganache / Truffle - QA automation / SDET backgrounds ### Nice to Have - Docker / Kubernetes - CI/CD pipelines - AWS / Azure / GCP - Security testing / observability / DevOps exposure **Location:** New York **Salary:** $100k–$140k depending on experience If you’ve worked on enterprise blockchain, Web3 infrastructure, digital assets platforms, or distributed ledger systems, I’d be keen to speak. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
16 days ago
## **DRW** – Associate Relationship Manager (Cumberland) **DRW** is a diversified trading firm with over three decades of experience bringing sophisticated technology and exceptional people together to operate in markets around the world. We value autonomy and the ability to quickly pivot to capture opportunities, so we operate using our own capital and trading at our own risk. Headquartered in Chicago with offices throughout the U.S., Canada, Europe, and Asia, we trade a variety of asset classes including Fixed Income, ETFs, Equities, FX, Commodities, and Energy across all major global markets. We have also leveraged our expertise and technology to expand into three non-traditional strategies: real estate, venture capital, and cryptoassets. We operate with respect, curiosity, and open minds. The people who thrive here share our belief that it’s not just what we do that matters–it's how we do it. DRW is a place of high expectations, integrity, innovation, and a willingness to challenge consensus. Join a leading crypto relationship management team delivering seamless 24/7 coverage to institutional counterparties around the world. As an **Associate Relationship Manager** at Cumberland, you’ll operate at the heart of a fast-paced, volatile, and exciting market — collaborating with leading experts and innovators in the crypto industry. You’ll combine market execution skills with relationship-building expertise to provide our global counterparties with an exceptional trading experience in both spot and derivatives markets. ### Responsibilities - Execute spot and derivative trades directly with institutional counterparties during your coverage hours. - Coordinate with traders and relationship managers in other regions to provide seamless time-zone transitions and consistent, high-quality service. - Take ownership of client inquiries and work with Onboarding, Operations, and Treasury teams to deliver fast, effective resolution. - Partner with Senior Relationship Managers to develop tailored solutions for counterparty needs – including deck construction and presentation material. - Generate and share original cross-market macro/micro insights (spot and options) – internally and externally. ### Qualifications - At least 2 years’ experience in institutional client coverage, sales, or relationship management. - Passion for crypto and understanding of digital asset market structure. - Strong organizational skills with the ability to multitask under pressure. - Highly motivated, entrepreneurial mindset with a strong sense of urgency. - Basic understanding of options and forward strategies. - Technical proficiency in Python and Java; Git, SQL, and Linux familiarity is desirable. - Excellent written/verbal communication and presentation skills – strong proficiency in PowerPoint. - English fluency required; additional languages are a strong plus. ### What We Offer - A key role in a lean, high-energy, globally distributed team at the cutting edge of crypto markets. - Immersive learning in a fast-moving market with exposure to innovative products. - Opportunities for career growth in a high-impact environment. - Collaborative culture that values performance, ideas, and initiative. ### Compensation & Benefits The annual base salary range for this position is **$100,000 to $150,000**, depending on the candidate’s experience, qualifications, and relevant skill set. The position is also eligible for an annual discretionary bonus. In addition, DRW offers a comprehensive suite of employee benefits including group medical, pharmacy, dental, and vision insurance, 401k (with discretionary employer match), short- and long-term disability, life and AD&D insurance, health savings accounts, and flexible spending accounts. ### Privacy Notice For more information about DRW's processing activities and our use of job applicants' data, please view our Privacy Notice at [https://drw.com/privacy-notice](https://drw.com/privacy-notice). California residents, please review the California Privacy Notice for information about certain legal rights at [https://drw.com/california-privacy-notice](https://drw.com/california-privacy-notice). When applying, mention the word **CANDYSHOP** to show you read the job post completely.
Genesis NGN
21 days ago
## Role Overview **Blockchain Java Backend Developer Job Description** We are looking for a **Blockchain Java Backend Developer** responsible for designing, developing, and maintaining backend services that interact with blockchain networks. The ideal candidate should have strong experience in **Java backend development, distributed systems, and blockchain technologies such as Ethereum or Hyperledger Fabric**. ## Key Responsibilities - Design and develop secure, scalable backend services in Java to interact with blockchain networks. - Build RESTful APIs and microservices to support blockchain-based applications. - Develop and integrate smart contracts using blockchain platforms such as Ethereum or Hyperledger Fabric. - Implement transaction processing, wallet integration, and blockchain node communication. - Ensure security, cryptography, and data integrity in blockchain applications. - Optimize system performance for high-throughput distributed environments. - Collaborate with frontend developers, DevOps teams, and blockchain architects. - Write unit tests, integration tests, and documentation. - Participate in architecture discussions and code reviews. ## Technical Skills ### Required Skills & Qualifications - Strong experience with Java backend development (Java 8+). - Experience with frameworks such as Spring Boot or Spring Framework. - Hands-on experience with blockchain platforms like: - Ethereum - Hyperledger Fabric - Corda (optional) - Experience with smart contracts (e.g., Solidity). - Knowledge of cryptography, consensus mechanisms, and distributed ledgers. - Experience building REST APIs and microservices. - Familiarity with Docker, Kubernetes, and cloud platforms. - Experience with relational or NoSQL databases. ### Preferred Skills - Experience with Web3 libraries such as Web3j. - Knowledge of DeFi, NFTs, or token standards (ERC-20 / ERC-721). - Experience with CI/CD pipelines and DevOps practices. - Understanding of event-driven architecture and messaging systems. ## Education - Bachelor's or Master's degree in Computer Science, Information Technology, or a related field. > **Note:** Client is not sponsoring any Visa. When applying, mention the word **CANDYSHOP** to show you read the job post completely.