Java Backend QA Engineer (White-box Focus)

Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries for our industry-leading security, user fund transparency, trading engine speed, deep liquidity, and an unmatched portfolio of digital-asset products. Binance offerings range from trading and finance to education, research, payments, institutional services, Web3 features, and more. We leverage the power of digital assets and blockchain to build an inclusive financial ecosystem to advance the freedom of money and improve financial access for people around the world.

About the Role We are looking for a passionate and curious Java Backend QA Engineer to join our team. You'll work closely with developers to ensure the quality of complex financial and Web3 products through deep technical testing — not just black-box validation, but real code-level understanding. This is a great opportunity for a young talent who wants to grow fast in a high-impact, high-velocity fintech environment.

Responsibilities: Design and execute white-box and grey-box test strategies for Java-based backend services, including unit, integration, and API testing

Read and analyze Java source code to identify edge cases, logic flaws, and potential risk points

Build and maintain automated test frameworks and test tooling for financial backend systems

Collaborate with developers on code reviews, test coverage analysis, and CI/CD pipeline quality gates

Test and validate blockchain transactions, web3 wallet operations, and on-chain/off-chain data consistency

Investigate production issues, trace root causes through logs, DB records, and service call chains

Leverage AI tools (e.g., LLM-assisted test generation, log analysis, code review) to amplify testing efficiency

Requirements:: 1+ years of experience in software testing or backend development

Solid understanding of Java — able to read, write, and debug Java code confidently

Hands-on experience with backend testing: REST APIs, message queues (Kafka), databases (MySQL/Redis)

Familiarity with microservice architectures and distributed systems concepts

Strong analytical mindset with attention to detail and a passion for breaking things (in a good way)

Preferred Requirements:: Experience in fintech, crypto, or blockchain domain testing

Knowledge of web3 wallets, on-chain data, or DeFi protocols

Familiarity with Spring Boot, Dubbo, or similar Java frameworks

Experience using AI-assisted tools in daily engineering work

Exposure to white-box testing techniques: code coverage, mutation testing, static analysis