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.
J ob Details:
Location: London Duration: 04/12/2026 Days on site: 2
Roles and Responsibilities:
* 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.
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 (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).
What's in it for you?
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).
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!
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