Senior SmartContract developer job at London Full Time NEW

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

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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