Mercuryo

About the Company

Mercuryo stands out in the decentralized ecosystem by leveraging payment use case growth and intuitive on-chain integration, enhancing the user experience, especially for newcomers to this market. We enable efficient capital flow within the DeFi ecosystem and consolidates various payment and banking solutions into a single, user-centric interface.

Since 2018, we’ve proudly partnered with industry leaders like MetaMask, Trust Wallet, Ledger, 1inch, PancakeSwap, and more, with plans to expand further as we continue to innovate with our stack of products.

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Listed Jobs

Company Name

Mercuryo

Job Title

QA Engineer

Job Description

Job title: QA Engineer Role Summary: Execute comprehensive functional, API, and security testing for web and mobile applications in a Web3/DeFi platform, maintain detailed test documentation, and manage defect lifecycle in collaboration with developers. Expectations: Minimum 5 years of testing experience across monolith and microservices environments; proven expertise in REST API testing, automated test development, and use of industry-standard tools; strong understanding of client‑server interaction and software development workflows; familiarity with bug tracking systems and security testing principles. Key Responsibilities: - Perform functional testing of web and mobile applications. - Conduct API testing, including REST, HTTP(s), AJAX, JSON, and XML. - Create and maintain test documentation and test plans. - Collaborate closely with developers and cross‑functional teams to resolve defects. - Manage and track bugs using a defect tracking system. - Utilize automated testing frameworks and tools. Required Skills: - API testing tools: Postman, JMeter, etc. - Proficiency with REST APIs, HTTP(s), AJAX, JSON, XML. - Experience with bug tracking systems (e.g., JIRA, Bugzilla). - Knowledge of automated testing and scripting (Java, JavaScript, Python). - Familiarity with developer consoles, Graylog, DBeaver, and security testing basics. - Understanding of software development workflows and version control (Git, SVN). - Optional: Experience with Docker and containerized environments. Required Education & Certifications: - Bachelor’s degree in Computer Science, Software Engineering, or related field preferred (not explicitly mandated). - Relevant certifications (e.g., ISTQB, CSM) are a plus but not required.

London, United kingdom

Remote

Mid level

04-02-2026