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.
Your mission
At 1inch, our engineering needs evolve rapidly. We are constantly seeking exceptional Blockchain Engineers to join our mission. Even if we do not have an active vacancy matching your exact seniority today, we want to hear from you.
We look for engineers with a high-agency, Get Stuff Done mindset and an unrelenting passion for decentralised innovation.
As part of our blockchain engineering ecosystem, you will contribute to designing, developing, and optimising the smart contracts and underlying infrastructure powering 1inch. We value sophisticated problem-solvers who can navigate the lightning-fast shifts of the crypto landscape while executing securely at scale. Working alongside our product leads and world-class engineers, your commitment to open-source excellence will keep 1inch at the absolute cutting edge of DeFi.
By applying to this talent pool, you will be fast-tracked for consideration the moment a new headcount opens in our global blockchain squad. We welcome applications across all career stages—from highly capable mid-level developers to seasoned principal architects.
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

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Get Hired
• 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 and your rights in relation to them, please see our Applicant and Candidate Privacy Notice.