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Java Backend QA Engineer (White-box Focus)
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.
What You'll Do
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Design and execute white-box and grey-box test strategies for Java-based backend services, including unit, integration, and API testing
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Read and analyze Java source code to identify edge cases, logic flaws, and potential risk points
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Build and maintain automated test frameworks and test tooling for financial backend systems
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Collaborate with developers on code reviews, test coverage analysis, and CI/CD pipeline quality gates
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Test and validate blockchain transactions, web3 wallet operations, and on-chain/off-chain data consistency
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Investigate production issues, trace root causes through logs, DB records, and service call chains
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Leverage AI tools (e.g., LLM-assisted test generation, log analysis, code review) to amplify testing efficiency
What We're Looking For
Required
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1+ years of experience in software testing or backend development
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Solid understanding of Java — able to read, write, and debug Java code confidently
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Hands-on experience with backend testing: REST APIs, message queues (Kafka), databases (MySQL/Redis)
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Familiarity with microservice architectures and distributed systems concepts
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Strong analytical mindset with attention to detail and a passion for breaking things (in a good way)
Nice to Have
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Experience in fintech, crypto, or blockchain domain testing
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Knowledge of web3 wallets, on-chain data, or DeFi protocols
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Familiarity with Spring Boot, Dubbo, or similar Java frameworks
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Experience using AI-assisted tools in daily engineering work
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Exposure to white-box testing techniques: code coverage, mutation testing, static analysis
What does a blockchain developer do?
A blockchain developer is a software developer who specializes in the development of applications that make use of blockchain technology
Some of the responsibilities of a blockchain developer may include:
- Designing and implementing smart contracts.
- Creating and maintaining the infrastructure that supports the blockchain network, and developing user-facing applications that make use of the blockchain.
- Additionally, a blockchain developer may also be responsible for researching and staying up-to-date with the latest developments in blockchain technology, in order to ensure that their applications are secure and efficient.