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1inch • Lisbon, Portugal
Role & seniority: Dubai-based Backend QA Engineer (DeFi/Web3-focused), mid-to-senior level responsible for quality strategy of DeFi backend systems.
Stack/tools: Web3-specific QA; Ethereum tooling (Geth, Infura); automated test frameworks (Hardhat, Foundry, Chai, Mocha); contract/protocol validation tools (Tenderly, The Graph); Docker, Kubernetes; CI/CD; familiarity with AMMs, lending protocols; knowledge of token standards (ERC20, ERC721); microservices architectures; message brokers (Kafka, NATS).
Design, develop, and maintain automated test suites for APIs, backend services, and smart contract interactions.
Implement integration, regression, and end-to-end testing for DeFi components; create mocks/stubs for Web3 environments.
Validate protocol integrations, analyze economic behaviors (slippage, liquidity depth, oracle responses), perform load/stress testing, and identify performance bottlenecks.
Experience testing systems that interact with Ethereum nodes and DeFi protocols.
Strong automated testing and test-automation capabilities; hands-on with Hardhat, Foundry, Chai, Mocha.
Experience with Docker, Kubernetes, and CI/CD; agile/Scrum environment; ownership mindset; strong cross-team communication.
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).
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/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
Work 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) Automated testing tools in Web3 (e.g., Hardhat, Foundry, Chai, Mocha) Strong skills in test automation Integration of De-Fi Protocols into backend systems Proficient in testing micro-services architectures and asynchronous systems using message brokers like Kafka or NATS Familiarity with DeFi primitives (e.g., Uniswap v2/v3, Compound, Aave, Curve)
Why Work for 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
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.