Senior Blockchain Developer

As a Senior Blockchain Developer at Luxoft, you'll partner with a leading UK financial institution to design and build enterprise-grade digital asset and Web3 solutions. You'll work at the intersection of traditional finance and blockchain technology, contributing to tokenization, digital custody, smart contracts, and next-generation financial infrastructure within a highly collaborative global team.

What you'll do

• Design, build and deploy Web3 components including smart contracts, wallet integrations, protocol connectors and event listeners
• Develop backend services using Java/Spring and Node.js to integrate with public and permissioned blockchain networks
• Write, test and optimise Solidity smart contracts with a focus on security, reliability and gas efficiency
• Build event-driven solutions to manage transaction lifecycles, on-chain events and state synchronisation
• Support tokenization, digital custody and DeFi/TradFi integration initiatives

What you bring

• Strong commercial experience delivering blockchain and Web3 solutions
• Hands-on Solidity development experience including smart contract design, testing and deployment
• Experience with Hardhat, Foundry, Truffle or similar blockchain development frameworks
• Strong knowledge of Web3J, Ethers.js, Web3JS, Viem or related blockchain SDKs
• Strong backend development skills using Java/Spring and/or Node.js
• Experience designing APIs, microservices and scalable distributed systems
• In-depth understanding of blockchain fundamentals, including consensus mechanisms, transaction lifecycles and gas models
• Knowledge of wallet infrastructure, private key management and blockchain security principles
• Experience with ERC-20, ERC-721, ERC-1155 and tokenization frameworks
• Strong understanding of event-driven architectures and asynchronous processing
• Experience with Kafka, RabbitMQ or similar messaging technologies
• Knowledge of cryptographic principles including digital signatures, hashing and PKI
• Experience with Docker, Kubernetes, Helm, Jenkins, Git and CI/CD practices

Nice to have

• Digital asset custody platform experience
• DeFi and TradFi integration projects
• Tokenization and blockchain-based financial products
• Experience with Hyperledger Besu
• Experience with Canton
• Experience with Solana
• Knowledge of Layer 2 technologies including Polygon, Optimism and zkSync
• Cross-chain interoperability solutions
• Financial Services or Capital Markets background