Job Title: Blockchain Developer Location: London, UK (Hybrid: 2-3 Days to office every week) Duration: 6 Months (Extendable) Employment Type: Contract B2B/Freelance {Inside IR35} Roles & Responsibilities: About the Role: We are seeking a highly skilled Blockchain Developer with strong hands-on experience in R3 Corda, Python, Microservices, and Node.js. You will join a forward-thinking engineering team working on enterprise-grade blockchain applications, primarily for the financial and regulated industries. The ideal candidate should possess a passion for decentralized systems, secure coding practices, and scalable backend services. Key Responsibilities: • Design, develop, and deploy blockchain-based solutions using R3 Corda for high-impact use cases. • Build and maintain backend services using Python and Node.js, following microservices architecture. • Develop and integrate smart contract logic and flows within the Corda framework. • Collaborate with architects, DevOps, and product teams to translate requirements into scalable solutions. • Design APIs, data models, and services ensuring high performance, scalability, and security. • Conduct code reviews, write unit and integration tests, and follow CI/CD best practices. • Stay up to date with emerging trends and technologies in blockchain and backend ecosystems. • Participate in technical design discussions and contribute to architectural decisions. Required Skills & Qualifications: • 3+ years of professional experience in blockchain development, with a strong focus on R3 Corda. • Proficient in Python and Node.js for backend development. • Strong knowledge of microservices architecture and RESTful API design. • Experience with Corda Flows, States, Contracts, and integration patterns. • Understanding of cryptographic principles, distributed systems, and secure coding practices. • Familiarity with databases (SQL and NoSQL), containerization (Docker), and cloud infrastructure (AWS/GCP/Azure). • Strong problem-solving skills and ability to work in Agile/Scrum environments. • Excellent communication and collaboration abilities. Preferred Qualifications: • Experience in financial services, supply chain, or regulated industries. • Knowledge of other blockchain platforms (e.g., Hyperledger Fabric, Ethereum) is a plus. • Exposure to Kubernetes and DevOps CI/CD pipelines. • Contributions to open-source blockchain projects are an advantage.