As a Senior Smart Contract Developer / Blockchain Engineer with expertise in enterprise blockchain platforms, you will collaborate with our client’s blockchain and cloud infrastructure teams, architects, product owners, and external partners in multi-organisation blockchain networks. You will be responsible for designing, developing, testing, and deploying smart contracts and blockchain solutions for enterprise environments.

Location: London
Duration: 04/12/2026
Days on site: 2

• Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, GoQuorum, Hyperledger Besu, Corda).
• Implement asset tokenization, on-chain/off-chain data models, and blockchain transaction workflows.
• Develop and integrate RESTful APIs and microservices (Node.js / Java) to interact with smart contracts.
• Ensure security, performance, and scalability of smart contracts and blockchain applications.
• Collaborate with architects, product owners, and external partners in multi-organization blockchain networks.
• Lead or mentor development teams, enforcing coding standards, testing, and best practices.
• Work closely with cloud infrastructure teams to deploy blockchain solutions using Azure/AWS services.
• Support POCs, innovation initiatives, and exploration of Layer 2 scaling solutions.
• Participate in design reviews, audits, and governance processes related to blockchain systems.

• 8+ years of experience in software engineering with strong blockchain focus.
• Hands-on experience with Solidity smart contract development.
• Strong understanding of Ethereum-compatible platforms (GoQuorum, Hyperledger Besu).
• Experience with enterprise blockchain frameworks such as R3 Corda and Ripple.
• Proficiency in Node.js, TypeScript, and/or Java (Spring Boot).
• Strong knowledge of microservices architecture and asynchronous processing patterns.
• Experience designing on-chain vs off-chain data models.
• Familiarity with REST APIs, event-driven systems, and message queues.
• Solid understanding of blockchain security concepts (permissions, key management, transaction integrity).

Our client loves to reward their people for doing a great job.
• This is a contract role until 2/2026.
• A daily rate, in-scope IR35, of £535 (via a Hays Approved Umbrella Company).
• This role provides a hybrid working access in London (2 days onsite).

Once you’ve applied, one of our friendly recruitment consultants will give you a call and talk you through the screening process.

If your application is successful, you’ll be involved in a live virtual interview with one of our client’s hiring managers to get to know you better. We look forward to speaking to you!