Senior SmartContract developer

About the role:

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.

Job Details:

Location: London

Duration: 04/12/2026

Days on site: 2 days/ Week

Roles and Responsibilities:

• Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, Go Quorum, 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.

Other stuff we’re potentially looking for:

• 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 (Go Quorum, 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).

What’s in it for you?

• This is a contract role until Dec 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).

Next Steps:

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!