QA Engineer Backend

1inch

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)