Software Engineer, Blockchain

1inch is the DeFi ecosystem building financial freedom for everyone. 1inch products help users and builders trade, hold and track digital assets - with the self-custody, comprehensive security and the intuitive user experience they need to unlock the potential of true crypto ownership. 1inch protocols and APIs provide core infrastructure across the DeFi industry and beyond.

What you'll do

Contribute to the design and optimisation of scalable, secure, and high-performance blockchain architectures

Develop, integrate, test, and maintain smart contracts and decentralised protocol components

Conduct technical research and support proof-of-concept initiatives for new blockchain and DeFi features

Contribute to cross-chain interoperability solutions, including bridging and atomic swap mechanisms

Improve execution efficiency and optimise smart contract logic for gas consumption and performance

Collaborate with engineering and security teams to identify vulnerabilities and strengthen protocol reliability

Participate in code reviews, testing, CI/CD workflows, and engineering best practices

Work closely with cross-functional teams to support successful product delivery and continuous improvement

Who you are

Professional software engineering experience with a strong focus on blockchain development and decentralised systems

Strong understanding of Ethereum, EVM-based ecosystems, smart contracts, and decentralised application architecture

Hands-on experience developing with Solidity, Yul, Rust, and TypeScript

Experience working with Layer 2 scaling solutions, cross-chain infrastructure, or blockchain interoperability protocols

Strong understanding of smart contract security principles, testing methodologies, and vulnerability mitigation

Experience using modern blockchain development frameworks such as Foundry or Hardhat

Interest in or understanding of DeFi concepts including AMMs, liquidity pools, routing, or oracle integrations

Strong problem-solving skills and ability to work effectively in fast-paced engineering environments

Nice to haves

Experience contributing to open-source blockchain or Web3 projects

Familiarity with zero-knowledge technologies or rollup architectures

Experience building distributed systems or low-latency infrastructure

Understanding of blockchain infrastructure automation and deployment tooling

Experience working in high-growth startup or scale-up environments

What we can offer

Work alongside a globally distributed and highly collaborative team that has helped shape the history of DeFi and Web3 innovation

Join a fast-paced environment where ownership, initiative, and fresh ideas are encouraged and supported

Competitive compensation package, including a discretionary bonus scheme aligned with your impact and contribution

Full equipment support for your remote workspace setup, plus a dedicated learning and development budget

Flexible remote-first culture with an unlimited paid time off policy to support work-life balance

1inch is an equal opportunity employer. We are committed to evaluating all candidates on the basis of their skills, experience, and potential — regardless of race, ethnicity, nationality, gender, age, religion, disability, or any other characteristic. We believe diverse teams build better products, and we welcome applications from all backgrounds.

We use AI-assisted tools to help us review applications efficiently. These tools support our recruitment team but do not make decisions on our behalf — every application is reviewed by a person before any outcome is determined. No offer or rejection is made solely on the basis of automated processing. For full details on how we use these tools