Manual QA engineer

Were hiring a Manual QA Engineer at Just Slots to help us deliver reliable polished games and effective tools for game development.

This is a manual-first role with broad scope covering web-based game clients internal development tools backend integrations and production workflows. You will also use agentic and AI-assisted testing tools to improve test coverage accelerate exploratory testing and identify risks earlier.

You wont just execute test casesyoull help shape how quality is built into our games tools and development processes.

• Perform manual testing across:

  • web-based slot games and interactive game clients

  • internal tools used to create configure and release games

  • backend and RGS integrations

  • APIs WebSockets and frontend/backend interactions

  • production and release workflows

• Plan and perform functional exploratory regression integration usability and compatibility testing.

• Test game mechanics user journeys animations audio paytables bonus features error handling and game configurations.

• Verify that development tools are intuitive reliable and behave correctly across realistic workflows.

• Create clear test plans test cases checklists and exploratory testing charters.

• Report defects with concise reproduction steps supporting evidence expected behaviour and an assessment of severity and player impact.

• Investigate issues using browser developer tools logs network traffic and API-testing tools.

• Use agentic and AI-assisted testing tools to:

  • generate and expand test scenarios

  • discover edge cases

  • support exploratory and regression testing

  • create test data

  • analyse failures and testing results

• Critically review AI-generated test cases and findings rather than relying on them without validation.

• Work closely with developers product automation QA game teams artists and other stakeholders.

• Retest fixes and support release verification.

• Help identify quality risks and unclear requirements early in development.

• Improve test coverage documentation and the overall QA process.

• Highlight suitable scenarios for future test automation.

• Experience manually testing web applications games or other interactive products.

• Strong knowledge of manual testing techniques including exploratory functional regression integration and usability testing.

• Ability to turn requirements designs and user stories into effective test scenarios.

• Excellent attention to detail and a strong instinct for unusual behaviours and edge cases.

• Experience writing useful reproducible defect reports.

• Strong debugging analytical and problem-solving skills.

• Confidence working across several products tools and technical domains.

• An understanding of browser developer tools and client-server applications.

• Interest inor experience withagentic and AI-assisted approaches to software testing.

• Ability to assess AI-generated testing output critically and verify results manually.

• A proactive hard-working and delivery-focused mindset.

• Clear communication in English.

Were open to different levels of experience for the right candidate. What matters most is curiosity ownership testing judgement and the ability to improve product quality through thoughtful manual and agentic testing.

• Experience testing games or interactive web applications.

• Understanding of slot mechanics game states paylines or ways RTP volatility bonus features and game configuration.

• Experience testing tools used by game designers developers artists or producers.

• Familiarity with regulatory compliance or responsible-gaming requirements.

• Experience in real-money gaming.

• Experience testing REST APIs with tools such as Postman.

• Familiarity with WebSockets browser network inspection and application logs.

• Experience testing across browsers operating systems devices and screen sizes.

• Experience using AI testing agents generative AI or other AI-assisted QA tools.

• Basic understanding of automated testing and the ability to collaborate with automation engineers.

• Experience working in a greenfield or fast-growing environment.

• Flexible schedule (40 hours per week).

• High autonomy and ownership.

• 33 days of vacation plus company holidays.

• Help shape the quality of real production games and the tools used to build them.

• Work across the full game-development lifecycle.

• Opportunities to influence how manual automated and agentic testing work together.

• Team meetups across Europe.

If you enjoy finding problems others miss exploring complex systems and helping teams deliver better games and tools we should talk.