About this role
Project description Modernization as a Service (MaaS) is a cross-functional practice supporting all business verticals within the company.
We are seeking a Senior Blockchain Developer to join our project with our client, a leading financial institution in the UK.
Responsibilities
- Design, build, and deploy Web3 components, including smart contracts, event listeners, wallet integrations, and protocol connectors for a digital asset platform.
- Develop backend services using Java/Spring and Node.js to interface with public and permissioned blockchains through SDKs such as Web3J, Ethers.js, and Viem.
- Write, test, and audit Solidity contracts to ensure security, correctness, and gas efficiency.
- Implement event-driven architectures to handle on-chain events, transaction lifecycles, and state synchronization.
- Support tokenization, custody, and DeFi/TradFi bridging integrations, contributing to architectural and design decisions.
- Maintain engineering standards by performing code reviews, producing documentation, and participating in Agile delivery within a distributed global team.
Skills
- Smart contracts: Solidity development, testing (Hardhat, Foundry, Truffle), security best practices, gas efficiency
- Web3 libraries: Web3J, Web3JS, Ethers.js, Viem — integrated into enterprise backends
- Backend engineering: Java/Spring and/or Node.js, API design, microservices, design patterns
- Blockchain fundamentals: consensus mechanisms, transaction lifecycle