Job Description
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 As a Senior Software Engineer, Blockchain at 1inch, you will help design, build, and optimise the smart contracts and blockchain infrastructure powering one of the leading DeFi ecosystems. Working closely with product and engineering leadership, you will contribute to scalable, secure, and high-performance decentralised systems that support millions of users globally. This role combines deep technical expertise with a strong product and innovation mindset, requiring hands-on experience across smart contract development, blockchain architecture, and protocol security. You will play a key role in advancing cross-chain interoperability, improving execution efficiency, and maintaining engineering excellence across the development lifecycle while contributing to the evolution of cutting-edge Web3 infrastructure. What you’ll do Design and optimise blockchain architectures with a strong focus on scalability, security, and performance Develop, integrate, and maintain smart contracts across decentralised protocols and infrastructure components Conduct technical research and build proof-of-concepts for new DeFi and blockchain innovations Design and improve cross-chain interoperability solutions, including bridging and atomic swap mechanisms Optimise smart contract execution efficiency with a focus on gas consumption and low-latency performance Collaborate with internal and external security auditors to identify vulnerabilities and strengthen protocol security Lead code reviews and contribute to engineering best practices, CI/CD workflows, and development standards Mentor junior and mid-level e
