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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 â 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 â 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 is a QA in a job?
QA stands for Quality Assurance, which is a process or department in a company responsible for ensuring that products or services meet a certain level of quality
In a job, QA may refer to the role of a Quality Assurance Engineer or a Software Testing Engineer, who is responsible for designing and implementing quality control procedures to ensure that products or services meet the company's quality standards
A QA Engineer may be involved in various stages of the product or service development cycle, from designing and planning quality control procedures to executing testing and analysis to identify and address issues or defects
They may also work closely with other departments, such as engineering, product management, and customer support, to ensure that customer needs are met and that products or services meet the desired level of quality
In the context of Web3, Quality Assurance (QA) refers to the process of testing decentralized applications (DApps), smart contracts, and other blockchain-based solutions to ensure their functionality, security, and performance
The role of a QA Engineer in Web3 may involve designing and implementing testing strategies to identify and fix bugs, vulnerabilities, and other issues that could affect the user experience, data integrity, or network security
Some of the specific responsibilities of a QA Engineer in Web3 may include:
- Developing test cases and scenarios for DApps, smart contracts, and other blockchain-based solutions
- Conducting automated and manual testing to identify and fix issues
- Collaborating with developers, product managers, and other stakeholders to ensure the quality of the product
- Ensuring that DApps and smart contracts are compatible with different blockchain networks and standards
- Contributing to the development of tools and frameworks for testing Web3 applications.