QA Engineer Backend

Job description / Role

About the role

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.

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 hire with a focus on Dubai and Europe. For this role, we prefer candidates who are either based in Dubai or working remotely within +/- 4 hours GST time.

Position summary

We are looking for a Dubai-based Backend QA Engineer (DeFi/Web3-focused) to own and drive the quality strategy for our DeFi backend systems. This role will involve designing robust test frameworks, validating smart contract integrations, and ensuring performance, security, and reliability across our DeFi protocol integrations. You should be deeply familiar with Web3 architecture, DeFi primitives, and have experience working in high-load environments with a strong focus on test automation.

Responsibilities

• Designing, developing, and maintaining automated test suites for APIs, backend services, and smart contract interactions.
• Implementing integration, regression, and end-to-end testing strategies for DeFi components.
• Creating mocks and stubs for Web3 environments, token behaviours, and smart contract logic to ensure thorough code coverage using static and dynamic analysis tools.
• Validating the integration of new DeFi protocols (e.g., AMMs, lending markets) into backend systems.
• Analysing and simulating economic behaviours, such as slippage, liquidity depth, and oracle responses.
• Testing token standards (ERC20, ERC721, etc.) and smart contract edge cases.
• Performing load and stress testing on backend systems that interact with blockchain nodes, while also monitoring latency and transaction throughput.
• Identifying performance bottlenecks and working with engineering teams to address them.
• Collaborating with the backend team to identify and reproduce issues.
• Utilising tools such as Hardhat, Foundry, Tenderly, and The Graph for contract and protocol validation.

Requirements

• Experience working with Docker, Kubernetes, and CI/CD pipelines to ensure seamless QA environments.
• Prior QA experience in fintech, DeFi, or crypto projects.
• Experience testing backend services.
• Enterprise-oriented mindset with a focus on structure, scalability, and quality.
• Comfortable working in a Scrum-based, agile environment.
• Strong sense of ownership and proactive communication in distributed teams.

Skills

• Experienced in testing systems that interact with Ethereum nodes (e.g., Geth, Infura).
• Familiarity with automated testing tools in Web3 (e.g., Hardhat, Foundry, Chai, Mocha).
• Strong skills in test automation.
• Integration of DeFi protocols into backend systems.
• Proficient in testing microservices architectures and asynchronous systems using message brokers like Kafka or NATS.
• Familiarity with DeFi primitives (e.g., Uniswap v2/v3, Compound, Aave, Curve).