Software Engineer Blockchain

About 1inch

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.So if you’re someone who thinks big, moves fast and wants to make an impact right from day one, then get ready to join our industry-changing team.We're looking for multiple Blockchain Engineers with various levels of experience, a "Get Stuff Done" mentality and a passion for innovation. As a key member of our team, you'll be responsible for designing, developing, and optimising smart contracts and blockchain infrastructure. This role requires a strong problem-solver who can navigate the constant changes of the crypto market while executing quickly and maintaining a high standard of security and quality.You'll work closely with the CPO, product teams, and other engineers to deliver innovative and secure solutions within the DeFi ecosystem. Your commitment to decentralisation and open-source development will be essential in helping us stay ahead of industry trends and build a platform that is robust and forward-thinking.

Responsibilities

• Designing and optimising blockchain product architecture, with a focus on scalability, security, and performance
• Leading the development, auditing, and integration of smart contracts within decentralised protocols
• Conducting technical research and proof-of-concept (PoC) experiments, while implementing best practices in blockchain development
• Developing and improving cross-chain interoperability solutions, such as cross-chain swaps and bridges
• Designing and developing efficient algorithms, with a focus on gas optimisation
• Defining and implementing effective CI/CD processes for blockchain development
• Analysing and addressing potential attack vectors and ensuring security best practices
• Continuously monitoring emerging blockchain, Web3, and crypto technologies
• Performing rigorous code reviews, mentoring developers, and enforcing best practices in blockchain engineering
• Collaborating with auditors and cross-functional teams to ensure successful product launches

Requirements

• 4+ years of software development experience, with at least 2+ years in blockchain engineering
• Deep understanding of blockchain ecosystems, smart contracts (Solidity, Yul, EVM), and decentralized applications (dApps)
• Hands-on experience with Ethereum, Layer 2 solutions (Optimistic & ZK Rollups), and cross-chain protocols (atomic swaps, bridges, etc.)
• Proven track record in technical leadership, architectural decision-making, and mentoring development teams (Senior Level and above only)
• Strong background in blockchain security and experience with smart contract audits

Skills

• Proficiency in Solidity, Yul, Rust, TypeScript
• Experience with smart contract development and deployment frameworks (Foundry, Hardhat)
• Understanding of DeFi protocols, AMMs, liquidity pools, and oracle integrations
• Expertise in blockchain security principles and smart contract auditing methodologies
• Experience in building high-performance distributed systems

Why you'll love working with us

• Join a young, creative team in a fast-paced and supportive environment
• We’re open to new ideas — if you’ve got a vision, pitch it and make it happen
• Enjoy competitive pay that matches your skills and experience
• Be part of a company that’s shaping the future of DeFi
• Take time when you need it — we offer unlimited vacation days
• Get fully compensated for your work gear — we’ll set you up for success

Hiring Process Note

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Key skills/competency

• Blockchain Architecture
• Smart Contract Development
• DeFi Protocols
• Blockchain Security
• Cross-chain Interoperability
• Solidity Development
• EVM
• Layer 2 Solutions
• Code Auditing
• Distributed Systems