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December 17, 2025

Senior QA Engineer (Backend / API)

Senior • Hybrid

$170 - $220/

Warsaw, Poland

Role Overview:


We are looking for a QA Engineer to join the team developing our intraday / real-time risk platform in the financial markets domain. The platform is live in production and is currently undergoing intensive scaling, with additional trading desks being onboarded sequentially.

This is a fully technical role focused on backend and API, with a strong emphasis on stability, regression, and data quality in a high business-critical environment.



Key Responsibilities:


  • Test backend services and APIs (functional + regression)

  • Conduct integration testing in a distributed systems environment

  • Validate risk data (intraday vs EOD, consistency, completeness)

  • Collaborate with developers (Java) to analyze defects and edge cases

  • Test changes arising from onboarding new trading desks

  • Work closely with releases – ensuring fast feedback loops

  • Contribute to defining backend testing strategies



Must-Have Skills:


  • Experience as a QA / Test Engineer in backend systems

  • Strong knowledge of API testing (REST Assured)

  • Practical experience with Java-based systems (reading code, understanding logic)

  • Experience with gRPC / RPC-based communication (or similar mechanisms)

  • Testing real-time / near real-time systems or complex data systems

  • Experience with CI/CD – preferred: Azure DevOps

  • Experience working in Agile environments

  • Ability to analyze problems independently

  • Experience in Financial Markets / Risk / Trading systems