Java Jobs
60 jobs found
2 days ago
🇩🇪 This job ad is written in German. 🇩🇪 easybill ist eine cloudbasierte Rechnungssoftware, die sich durch einfache Anwendung, umfassende Funktionalität und vielfältige Anbindungen über Schnittstellen schon seit mehr als 18 Jahren am Markt behauptet. Aktuell haben wir mehr als 21.000 aktive Kunden und wachsen stetig weiter. Deshalb suchen wir nach einer motivierten Verstärkung für unser Team. Bei easybill arbeiten wir Remote-First, dein Wohnort ist uns egal - wir suchen die besten Kollegen*, nicht die schönste Stadt. Unsere festen Standorte befinden sich in Hamburg und Willich. Bei regelmäßigen Team-Events kommen wir trotzdem gerne zusammen, um uns auszutauschen und auch mal zu feiern. Das ideale Profil: PHP-, TypeScript- und Rust-Expertise, Founding-Engineer-Vibes und eine starke Präsenz auf GitHub. Passt das Profil nicht vollständig, bist du aber ein außergewöhnlich starker Engineer, bewirb dich trotzdem und zeig uns, was du gebaut hast. Aufgaben Wir sind ein sehr motiviertes Team aus Softwareentwicklern. Als Teil des Teams würdest du neue Features und/oder Skalierungslösungen entwickeln. Ownership ist uns wichtig. Wir erwarten hohe Eigenverantwortung, die Motivation, komplette Projekte umzusetzen, und den Willen, die E-Rechnungslandschaft mitzuformen. Die Hauptanwendung ist in PHP / TypeScript geschrieben, wir entwickeln aber auch in Kotlin und bevorzugt Rust. Wir nutzen intensiv MySQL (Percona XtraDB Cluster), TiDB, Elasticsearch, Redis, MinIO, Docker und einiges mehr. Der Umgang mit mehreren Programmiersprachen wird jedoch vorausgesetzt. Eigenständiges, motiviertes und selbstorganisiertes Arbeiten – wir investieren gerne in unsere Kollegen, haben aber auch hohe Erwartungen. Backend-Entwicklung (PHP + Symfony) Frontend-Entwicklung (TypeScript + React + TanStack) Entwicklung von Microservices via Rust / Java Migration von PHP-Code zu Rust. Migrationen von Daten, Refactoring Fehleranalyse und Debugging Du musst verstanden haben, wie man KI als Produktivitätshebel verwendet. Wir erwarten intensiven Einsatz von Claude Code. ggf. Arbeiten an der Infrastruktur und lokalen dockerisierten Entwicklungsumgebungen Qualifikation Grundsätzlich musst du nicht alles können. Uns ist wichtig, dass du uns zeigen kannst, dass du dich in deinem aktuellen Technologie-Stack richtig gut auskennst und uns glaubhaft machen kannst, dass du bereit bist, unseren Stack zügig zu lernen. Tiefe Kenntnisse im Bereich der Softwareentwicklung. Eingesetzt wird viel PHP und/oder je nach Schwerpunkt TypeScript, zudem haben wir etwas Java sowie Rust im Stack. Bist du Experte im Umgang mit Rust, Java, Go, Zig oder anderen Sprachen, lernen wir dich aber auch gerne kennen. Bonus: Erfahrung mit Rust, DSA, TS, verteilten Systemen, datenlastigen Anwendungen Bonus: Open-Source-Contributions oder öffentliche Experimente (GitHub) Sprache: Fließend Deutsch und gute Englischkenntnisse Benefits Deutschlandweit Remote-First Team – keine Bindung an einen Standort Workation auf Mallorca - Unsere Mitarbeiter* haben die Möglichkeit, dieangemietete Villa auf Mallorca für eine inspirierende Kombination ausArbeit und Erholung zu nutzen Hoher Impact Eine inspirierende und flexible Arbeitsumgebung, die auf Vertrauen und Eigenverantwortung basiert. Wir sind ein offenes, motiviertes und nettes Team mit flacher Hierarchie Keine Sprints und künstlich erzeugter Druck Faire Vergütungspakete und Entwicklungsmöglichkeiten 30 Tage Jahresurlaub und einen unbefristeten Arbeitsvertrag Arbeitszeiten sind flexibel und werden mit dem Team abgestimmt Freiwillige Mitarbeiter-Events Aktuelle MacBook Pros Schulungen/Weiterbildungsmöglichkeiten im Wert von bis zu 1.500 Euro pro Jahr Wir haben vielfältige Herausforderungen und suchen einen motivierten Teamplayer! Wenn du dich hierin wiedererkennst und eine neue Herausforderung suchst, freuen wir uns auf deine Bewerbung. Wir freuen uns auf dich!
Harris Allied
10 days ago
## Blockchain/Smart Contract Developer A Financial Technology industry leader has an immediate need for a **Blockchain/Smart Contract Developer** to join their world-class technology team in a full-time role based in midtown Manhattan. The individual in this exciting role is responsible for the development of blockchain-based applications and decentralized applications (dApps), from smart contract design to intuitive and high-performing blockchain integration. In this hybrid role, you will work on the end-to-end delivery of secure, scalable, and engaging products. Expertise with blockchain technology (e.g., smart contracts, web3 integration), cloud platforms, tools and frameworks, and Python or Java is required. ### About the Role * 3+ years of experience in blockchain / smart contract software engineering * Designing, writing, and building secure smart contracts for Ethereum-based applications/token standards like ERC20, ERC721, and ERC1400 using Solidity along with third-party interfaces and design patterns like Upgradeable Proxy Pattern * Evaluating and integrating with multiple blockchain protocols, including both EVM and non-EVM ecosystems (Avalanche, Solana, Hyperledger) * Hands-on experience with tools/frameworks like OpenZeppelin, Hardhat, Foundry, ethers.js; including writing comprehensive and automated tests (unit, integration, and fuzz) * Integrating / bridging between blockchain/distributed ledgers and external components * Proficiency in two or more of the following languages: Java, TypeScript, Python ### Skills/Qualifications * Designing, implementing, and supporting distributed blockchain-based enterprise solutions for regulated domains (financial/banking/asset management) * Familiarity with Web3 ecosystems, DeFi, cross-chain interoperability, wallet integrations, layer 2 & scaling solutions * Familiarity with AI coding tools is a plus * Working knowledge of cloud platforms (Google Cloud, AWS) is a plus * Experience in software engineering with large and diverse codebase * Excellent writing and communication skills *When applying, mention the word **CANDYSHOP** to show you read the job post completely.*
Millennium Software and Staffing Inc
10 days ago
## Job Description We are looking for a **DLT Engineer** in **Charlotte, NC**. ### Must-Have Skills - **DLT (Distributed Ledger Technology)** - Tokenization - Blockchain - Programming language proficiency in one or more of: **Java, Go, Kotlin, or Node.js** - Payments experience with one or more of: **ACH, RTP, SWIFT, ISO20022**, etc. > When applying, mention the word **CANDYSHOP** to show you read the job post completely.
IntellectEU
12 days ago
## IntellectEU IntellectEU is an international technology company focused on digital finance and emerging technologies. At IntellectEU we are on a mission to become the top-of-mind fintech company. We are committed to our people and believe in building a better future with the newest technologies. We give rising talent and industry veterans the space to explore, launch ideas, and collaborate closely with our clients. With our technical hands-on experience in payments, blockchain and capital markets, there’s no challenge that’s left unsolved. Over the past two decades, we have earned our expertise in financial technology, executing on hundreds of complex integrations and co-creating new digital asset platforms alongside our clients. **Type of cooperation:** On-site, Manassas (Virginia) ## Responsibilities * Design, build, and deploy distributed ledger technology (DLT) solutions and smart contracts using Solidity, Java, and REST APIs. * Implement secure transaction logic using cryptographic techniques to protect digital assets and prevent unauthorized access. * Research, develop, and implement various blockchain protocols and consensus algorithms. * Collaborate with Product Owners and technical teams to gather requirements and define technical solutions. * Integrate blockchain solutions with enterprise systems, databases, and APIs. * Analyze and troubleshoot system performance, network issues, and blockchain transaction problems. * Develop documentation and technical specifications for blockchain implementations. * Contribute to continuous improvement, DevOps practices, and operational support. * Work with AWS deployment environments and infrastructure tools. ## Requirements ### Must have * Bachelor’s or Master’s degree in information technology, computer science, engineering, or equivalent experience. * Solid foundation in smart contracts development and relevant technologies (Solidity, Typescript, Vyper etc). * Knowledge of smart contract dev tools/frameworks - foundry, hardhat, openzeppelin libraries (Upgradeable contracts, proxy patterns). * Knowledge of smart contract security aspects (re-entrance attack, Race conditions, Integer overflow/underflow, Denial of service, etc). * Experience with Solidity security testing tools like Slither, Mythril, and Echidna. * Production experience with EVM-based blockchain applications. * Familiarity with basic cryptography and P2P networks. * Experience with web3.js or ether.js, and crypto wallets like MetaMask or MEW. * Understanding of RESTful web services design. * Understanding of the modern development ecosystem: Git, CI/CD, and automated testing. ### Nice to have * Experience with Hyperledger Besu. * Proficiency with databases such as MySQL, Oracle, and MongoDB. * Knowledge of Level 2 scaling technologies. * Experience with implementing ERC20 and ERC721 or IERC1155 contracts. ## We guarantee * International experience in a stable company: the company has offices in Antwerp, Lisbon, Krakow, Kyiv, New York and operates on the market for over 15 years. * A passionate team in an innovative, casual, positive, and open work environment ready to meet your new ideas. * Great opportunities for personal and professional development as well as the chance to change the way the business works in the financial world. **Join us to make an impact on the entire financial world!** *When applying, mention the word CANDYSHOP to show you read the job post completely.*
18 days ago
## Job Title: Fireblocks Implementation Specialist – Developer **Location:** Dallas or San Francisco (Onsite) **Employment Type:** Contract **Experience Level:** Mid-Senior (8–15 years) ## Job Summary We are seeking a highly skilled **Fireblocks Implementation Specialist – Developer** to lead the integration and development of secure digital asset infrastructure using Fireblocks. This role requires strong backend engineering expertise, API integration experience, and deep knowledge of blockchain technologies and cryptographic security. You will play a critical role in building secure, scalable systems for digital asset custody, transfers, and transaction workflows. ## Key Responsibilities - Design and implement integrations with Fireblocks APIs, SDKs, and webhooks - Develop backend services for **wallet management, transaction orchestration, and automation workflows** - Implement **secure key management solutions** leveraging MPC (Multi-Party Computation) - Configure transaction policies, role-based access controls, and approval workflows - Build monitoring, alerting, and reporting tools for digital asset operations - Troubleshoot and resolve issues related to blockchain transactions and API integrations - Collaborate with DevOps, Security, and Product teams to deploy scalable solutions - Ensure adherence to **U.S. compliance and security standards** (SOC 2, ISO 27001, PCI where applicable) - Support audit processes and maintain proper documentation ## Required Qualifications - 4+ years of software development experience (Java, Python, Node.js, or Go) - Strong experience with **REST APIs, webhooks, and microservices architecture** - Hands-on experience with Fireblocks or similar custody platforms (e.g., Coinbase Custody, BitGo) - Solid understanding of **blockchain protocols** (Bitcoin, Ethereum, etc.) - Knowledge of **cryptography and key management** (MPC, wallets, digital signatures) - Experience with **cloud platforms** (AWS preferred, Azure/GCP acceptable) - Familiarity with **CI/CD pipelines, Docker, Kubernetes** - Strong debugging and system design skills ## Preferred Qualifications - Experience in **fintech, crypto exchanges, or Web3 companies** - Knowledge of **smart contracts (Solidity)** - Experience with **HSMs (Hardware Security Modules)** - Understanding of **U.S. regulatory environment** (FinCEN, SEC considerations for digital assets) - Prior experience working in **client-facing or implementation roles** *When applying, mention the word CANDYSHOP to show you read the job post completely.*
20 days ago
## Senior AI Engineer (Engineering Productivity) **Location:** Asia / Hong Kong **Department:** Engineering – Data Science/AI **Commitment:** Full-time Onsite or Remote **Workplace Type:** Remote We're looking for a **Senior AI Engineer** to join our Engineering Productivity team, focused on leveraging AI/LLM technologies to fundamentally improve how our engineers build, test, deploy, and operate software. You'll design and implement AI-powered tools and systems that measurably accelerate development velocity across the organization. ### What You'll Do: - Design and build AI-powered developer tools (code generation, automated review, intelligent testing) that improve engineering efficiency across the company - Develop and deploy LLM-based applications (RAG, AI Agents, code understanding) to streamline internal workflows — from coding to deployment to incident response - Build and optimize AI-assisted CI/CD pipelines, including intelligent test selection, build failure prediction, and deployment risk assessment - Create internal knowledge retrieval systems (RAG-based) enabling engineers to quickly search and understand codebases, documentation, and architectural decisions - Evaluate, fine-tune, and integrate state-of-the-art LLMs (open-source and commercial) for engineering use cases - Define metrics and conduct A/B tests to measure the impact of AI tools on developer productivity - Collaborate closely with engineering teams across the organization to identify high-impact automation opportunities ### What We're Looking For: - 5+ years of software engineering experience, with at least 2 years focused on AI/ML engineering - Strong hands-on experience with LLMs — including prompt engineering, RAG, fine-tuning (SFT/RLHF), and AI Agent frameworks (LangChain, LangGraph, CrewAI, or similar) - Solid programming skills in Python; experience with Go, Java, or TypeScript is a plus - Experience building production-grade AI applications — not just prototypes - Familiarity with code analysis tools and techniques (AST parsing, static analysis, LSP) is highly preferred - Understanding of modern CI/CD systems and DevOps practices - Strong system design skills — ability to architect scalable, reliable services - Excellent problem-solving skills with a pragmatic, results-oriented mindset ### Nice to Have: - Experience building AI coding assistants or developer productivity tools - Experience with code embedding models and code search systems - Contributions to open-source AI/ML projects - Publications in relevant areas (NLP, code intelligence, SE + AI) - Experience in the Web3/crypto industry --- *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.* **Apply for this job** *When applying, mention the word **CANDYSHOP** to show you read the job post completely.*
Atlantic Partners Corporation
22 days ago
## Job Description We are looking for a **Blockchain Developer** who will be responsible for designing, implementing, and supporting a distributed blockchain-based network. Your primary responsibility will be analyzing requirements, designing blockchain technology around a certain business model, and the building and launching of a blockchain network. ## Responsibilities * Research, design, develop, and test blockchain technologies * Brainstorm and help evaluate applications for new tools and technologies as they continually evolve * Maintain and extend current client- and server-side applications responsible for integration and business logic * Be involved in the global blockchain community—work on implementing and integrating the latest improvement proposals * Document new solutions as well as maintaining that of existing ones ## Skills * Strong software development background * Experience working with large codebases * Experience working with open-source projects * Proficiency in one of the following languages: C++, Java, JavaScript * Strong knowledge of common algorithms and data structures * Familiarity with basic cryptography * Familiarity with P2P networks * Strong knowledge of bitcoin-like blockchains * Strong knowledge of concurrency and writing efficient and safe multithreaded code * Strong knowledge of STL, C++11 * Proficiency in the Qt Widgets module When applying, mention the word **CANDYSHOP** to show you read the job post completely.
23 days ago
# Binance Accelerator Program - Performance Engineer **Location:** Asia / Taiwan, Taipei **Department:** Engineering – QA **Program:** Binance Accelerator Program **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. ## About Binance Accelerator Program Binance Accelerator Program is a concise fixed-term program designed for Early Career Talent to have an immersive experience in the rapidly expanding Web3 space. You will be given the opportunity to experience life at Binance and understand what goes on behind the scenes of the worlds’ leading blockchain ecosystem. Alongside your job, there will also be a focus on networking and development, which will expand your professional network and build transferable skills to propel you forward in your career. Learn about BAP Program HERE. ### Who may apply Current university students and recent graduates. We're looking for a passionate intern to join our Performance Engineering Team and help pioneer the intersection of AI and Performance Engineering. This isn't your typical internship — you'll be at the forefront of applying cutting-edge AI technologies to solve real-world performance challenges in large-scale distributed systems. ## What You’ll Do 1. **Build Your Foundation:** Start with hands-on performance testing and tuning tasks, master the fundamentals before innovating. 2. **AI-Powered Performance Testing:** Design and implement intelligent test strategies using LLMs, ML models, and AI agents to automate and enhance performance testing workflows. 3. **Intelligent Performance Analysis:** Build AI-driven tools that can automatically detect anomalies, identify bottlenecks, and provide actionable insights from complex performance data. 4. **Innovation & Research:** Explore and experiment with the latest AI technologies and evaluate their potential in performance engineering. 5. **Real Impact:** Your work will directly influence how we ensure system reliability and performance for millions of users. ## Must Have 1. Currently pursuing a degree in Computer Science, Software Engineering, or related field. 2. Solid understanding of AI/ML fundamentals (LLMs, prompt engineering, fine-tuning concepts). 3. Programming experience in Java/Python/Golang. 4. Curiosity and passion for exploring new AI technologies. 5. Strong problem-solving skills and self-driven attitude. ## Nice to Have - Familiarity with Java/Spring Boot ecosystem. - Basic understanding of performance testing concepts (load testing, profiling, metrics). ## How to Apply Send us your resume along with any AI/ML projects (if any) you've worked on (GitHub links, demos, or descriptions). ## 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.* **Apply for this job** *When applying, mention the word CANDYSHOP to show you read the job post completely.*
Altusmeus
29 days ago
***********Client is not sponsoring any VISA********* *********Please don't apply if you are on H1B or on OPT visa*********** ## **Blockchain Developer – Job Description** ### **Role Overview** 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**. ### **Required Skills & Qualifications** #### **Technical Skills** * 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 related field**. When applying, mention the word **CANDYSHOP** to show you read the job post completely.
30 days ago
## Payment Integration Operation Manager **Location:** UAE, Dubai **Department:** Product & Design – Product **Commitment:** Full-time **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. ### Responsibilities - Work directly with merchants and PSP partners to guide them through the full integration lifecycle, from solution design and API integration to testing, go-live, and post-launch support. - Lead technical discussions with merchant product and engineering teams to design optimal integration approaches using Binance payment solutions. - Act as the primary liaison between merchants, product managers, and engineering teams to ensure smooth communication and efficient problem solving. - Provide hands-on support during merchant integrations, helping troubleshoot technical issues and ensuring a high integration success rate. - Educate merchants on integration best practices, API usage, and optimal payment flows for both web and mobile environments. - Support merchants in designing effective checkout experiences and payment UI/UX to improve end-user conversion and payment success rates. - Conduct integration testing with merchants and internal teams to validate payment flows and ensure readiness for launch. - Analyze merchant feedback, performance data, and market trends to identify opportunities to improve Binance payment products and integration tools. - Collaborate with product teams to close functionality gaps and propose enhancements that improve merchant integration experience. - Engage with merchants regularly to understand their needs, gather insights, and help optimize their payment integration over time. ### Requirements - 5+ years of experience in payment integrations, fintech, or merchant-facing technical roles. - Experience working with payment gateways, PSPs, or merchant payment solutions. - Strong understanding of REST APIs and integration workflows. - Ability to work directly with merchant product or engineering teams to guide technical integrations. - Strong communication skills with the ability to explain technical concepts to non-technical stakeholders. - Experience coordinating cross-functional teams across product, engineering, and business. - Familiarity with web or mobile technologies (JavaScript, Node.js, HTML5, Java, Python, etc.) is a plus. - Knowledge in crypto or Web3 payment infrastructure is a strong advantage. ### 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.* **Apply for this job** *When applying, mention the word CANDYSHOP to show you read the job post completely.*