Senior Blockchain Engineer

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.

Location: We prioritise candidates who are based in Dubai then consider those working remotely in one of our European Hub Locations (UK, Spain or Germany).

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.

Key Responsibilities

• Architecture & Scalability: Design and optimise robust blockchain product architecture, keeping scalability, security, and peak performance at the absolute forefront
• Smart Contract Lifecycle: Contribute to the end-to-end development, integration, and internal auditing of high-value smart contracts across decentralised protocols
• R&D and PoCs: Conduct advanced technical research and execute proof-of-concept (PoC) experiments to pioneer new features within the DeFi space
• Cross-Chain Innovation: Design and evolve cross-chain interoperability solutions, including atomic swaps and advanced bridging infrastructure
• Gas Optimisation: Deep-dive into execution efficiency, writing logic with a strong focus on gas preservation and low-latency performance
• Security & Audit Collaboration: Systematically analyse attack vectors, enforce ironclad security protocols, and collaborate directly with cross-functional teams to ensure flawless product launches
• Engineering Excellence: Champion rigorous code reviews, build effective CI/CD pipelines for Web3, and collaborate closely across the engineering ecosystem to scale our technical capabilities
  
  

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Job Requirements

• Proven Footprint: Professional software development experience, with a dedicated focus on production-grade blockchain engineering and decentralised architectures
• EVM & Protocol Mastery: Strong, native understanding of the Ethereum ecosystem, smart contracts, and the underlying mechanics of decentralized applications (dApps)
• Language Proficiency: Deep hands-on experience developing with Solidity, Yul, or Rust
• Scaling & Infrastructure: Experience deploying to Layer 2 solutions (Optimistic & ZK Rollups) or manipulating cross-chain protocols
• Security Focus: A strong grounding in smart contract security principles, vulnerability mitigation, and testing methodologies
  
  
  
  

Skills

• Languages: Strong working proficiency in Solidity, Yul, Rust, and TypeScript
• Frameworks: Mastery of modern smart contract development and deployment workflows, specifically Foundry or Hardhat
• DeFi Domain: Deep interest in or understanding of AMMs, liquidity pools, complex mathematical models, and oracle integrations (e.g., Chainlink)

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• Systems: Experience or strong foundational knowledge in building high-performance, fault-tolerant distributed systems
  
  
  
  

Why join 1inch?

• Pioneering Spirit: Work with a globally distributed, highly collaborative team that shaped the history of DeFi; from winning hackathons to launching one of crypto's most legendary retroactive governance token airdrops
• Impact & Autonomy: Join a fast-paced, supportive environment where fresh ideas are valued. If you have a vision, you will have the space and autonomy to pitch it and make it happen
• Competitive Compensation: Enjoy a competitive salary that matches your expertise, paired with a discretionary bonus scheme to reward your impact
• Flawless Hardware & Development: We set you up for success by fully providing equipment for your remote workspace, alongside a dedicated learning and development budget to support your professional growth
• True Flexibility & Industry Access: Take time when you need it with our unlimited paid time off policy. Plus, represent 1inch on the ground, with opportunities to be deployed to major international crypto events and hackathons as needed
  
  
  
  

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.