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
Must have
Core / must-have:
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, gas models, wallet infrastructure, key management
Token standards: ERC-20, ERC-721, ERC-1155, ERC-3525 and tokenization patterns
Event-driven / async architecture: on-chain event listeners, state synchronization, message queuing (Kafka, RabbitMQ)
Cryptography applied to blockchain: digital signatures, hashing, PKI, secure key management
DevOps: Docker, Kubernetes, Helm, CI/CD (Jenkins), Git, Jira, observability tooling
Education: BSc in CS/Engineering; extensive overall software engineering experience with proven hands-on Web3 delivery
Soft skills / competencies
Security mindset (reentrancy, front-running, integer overflow awareness)
Attention to detail and rigour
driven by the immutability of on-chain deployments
Curiosity and fast adaptation to a rapidly evolving ecosystem
Clear communication with engineers, architects, and non-technical stakeholders
Self-managed delivery within Agile/Scrum sprints, distributed global team collaboration
Code review participation and technical documentation
Nice to have
Permissioned/alternative networks: Hyperledger Besu, Canton, Solana
Layer 2 (Polygon, Optimism, zkSync) and cross-chain interoperability
Digital asset custody, DeFi/TradFi bridging
Financial services or other regulated-industry background
MSc
Other
Languages
English: B2 Upper Intermediate
Seniority
Senior
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