Blockchain Developer

Square One Resources; City Of London; Hybrid; GBP 80,000 - 100,000; Part time

Job summary

A leading recruitment agency is seeking a skilled Blockchain Developer to work in London on a long-term contract. The successful candidate will design and deploy decentralised applications while collaborating with cross-functional teams. Key skills include proficiency in Java and Solidity, along with hands-on experience using Hyperledger Besu. This role is primarily onsite, with a competitive daily rate of £475.

Qualifications

• Strong proficiency in Java and Solidity.
• Hands-on experience with Hyperledger Besu or other EVM-based platforms.
• Understanding of cryptographic principles, gas optimisation, and blockchain security best practices.

Responsibilities

• Design, develop, and deploy decentralised applications using Hyperledger Besu or similar technologies.
• Write, test, and audit smart contracts in Solidity.
• Integrate blockchain components with wider enterprise systems.

Skills

Java

Solidity

Hyperledger Besu

smart contract development

web3.js

cryptographic principles

Education

Degree in Computer Science

Tools

Truffle

Hardhat

Job description

Job Title: Blockchain Developer
Location: London (3 days onsite per week)
Salary/Rate: £475 per day (Inside IR35)
Start Date: Immediate - contract until 31/12/2025
Job Type: Contract

Company Introduction:

We have an exciting opportunity with a leading partner who are looking for a skilled Blockchain Developer to join their team on a long-term project. This role offers the chance to work with cutting-edge blockchain technologies in a collaborative and innovative environment.

Job Responsibilities/Objectives:

As a Blockchain Developer, you will be responsible for the design, implementation, and maintenance of decentralised applications (dApps) on EVM-compatible platforms. You will also ensure the optimisation, security, and scalability of blockchain-based solutions.

• Design, develop, and deploy decentralised applications using Hyperledger Besu or similar technologies.
• Write, test, and audit smart contracts in Solidity.
• Integrate blockchain components with wider enterprise systems.
• Collaborate with cross-functional teams to define and deliver blockchain solutions.
• Optimise the performance and scalability of blockchain nodes and networks.
• Maintain and troubleshoot deployed applications and smart contracts.

Required Skills/Experience:

• Strong proficiency in Java and Solidity.
• Hands-on experience with Hyperledger Besu or other EVM-based platforms.
• In-depth knowledge of blockchain architecture and decentralised systems.
• Experience in smart contract development, testing, and deployment.
• Familiarity with frameworks such as web3.js, Truffle, or Hardhat.
• Understanding of cryptographic principles, gas optimisation, and blockchain security best practices.

Desirable Skills/Experience:

• Degree in Computer Science, Engineering, or a related discipline.
• Contributions to open-source blockchain projects.
• Experience with enterprise blockchain integrations.
• Knowledge of Ethereum Layer 2 solutions, Rollups, or Zero-Knowledge Proofs.

If you are interested in this opportunity, please apply now with your updated CV in Microsoft Word/PDF format.

Disclaimer:
Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.
Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.