Start.io logo

Quality Assurance Engineer

Start.io Warszawa, Pomeranian Voivodeship, Poland

onsitefull-time
Posted Jan 18, 2026Apply by Feb 17, 2026

Start.io is a mobile marketing and audience platform. Start.io (formerly StartApp) empowers the mobile app ecosystem and simplifies mobile marketing, audience building, and mobile monetization. Start.io's direct integration with over 500,000 monthly active mobile apps provides ac

Full Description

Start.io is a mobile marketing and audience platform. Start.io (formerly StartApp) empowers the mobile app ecosystem and simplifies mobile marketing, audience building, and mobile monetization. Start.io's direct integration with over 500,000 monthly active mobile apps provides access to unprecedented global first-party data, which can be leveraged to understand and predict behaviors, identify new opportunities, and fuel growth.

Role Overview

  • Develop comprehensive test cases and test scenarios based on business, functional, and technical requirements
  • Perform thorough functional, integration, and exploratory testing
  • Create detailed and clear bug reports with step-by-step reproduction steps
  • Participate in test planning, design, and review processes
  • Conduct user acceptance testing (UAT)
  • Collaborate closely with development teams to identify and resolve software defects

Requirements Strong English communication skills 5+ years of experience in manual software testing Solid understanding of software testing methodologies and best practices Excellent analytical and problem-solving skills Hands-on experience in API testing (REST/OpenRTB) Experience working with relational and non-relational databases (SQL-based systems, MongoDB, Aerospike, etc) Proficiency in writing clear and concise bug reports Experience with test management tools (e.g., Jira, Testmo, TestRail) Familiarity with Agile/Kanban development methodologies Attention to detail and commitment to quality

Advantage Knowledge in the programmatic advertising landscape – DSPs, SSPs, exchanges – significant advantage. Familiarity with ad tech concepts (SSP, DSP, RTB auctions). Understanding of automation testing concepts Experience with SDK testing Understanding of microservices architecture Show more Show less

Quality AssuranceManual TestingAPI TestingSQLMongoDBAnalytical SkillsProblem-SolvingBug ReportingTest Management ToolsAgileAttention to DetailSoftware Testing MethodologiesExploratory TestingUser Acceptance TestingIntegration TestingCollaborationmulti-location

Cookies & analytics consent

We serve candidates globally, so we only activate Google Tag Manager and other analytics after you opt in. This keeps us aligned with GDPR/UK DPA, ePrivacy, LGPD, and similar rules. Essential features still run without analytics cookies.

Read how we use data in our Privacy Policy and Terms of Service.