May 23, 2026

Senior Performance Tester (41914)

Senior • Hybrid

Warsaw, Poland

Location: Gdańsk, Gdynia or Warsaw, Poland

Working model: hybrid 2-3 days per week from the preferred office
Language: English
Contract: B2B, long-term, 12+ months

We are looking for an experienced Performance Tester / Performance Test Engineer to join a project focused on performance testing of web-based applications, API, microservices, and PEGA-based systems.

This role is ideal for someone with strong hands-on experience in LoadRunner Enterprise (LRE), including scripting with TrueClient and HTTP/HTML protocols, as well as a solid understanding of API and microservices performance testing.

Responsibilities

  • Design, develop, execute, and maintain performance test scripts using LoadRunner Enterprise (LRE).

  • Create, enhance, and maintain TrueClient and HTTP/HTML scripts for web-based applications.

  • Conduct performance, load, stress, endurance, and scalability testing.

  • Prepare performance test plans, workload models, test scenarios, and test reports.

  • Analyze application and system performance bottlenecks.

  • Provide recommendations for performance tuning and optimization.

  • Perform API and microservices performance testing, including service virtualization where required.

  • Monitor system performance using tools such as Dynatrace, AppDynamics, Splunk, Sysdig, Grafana, or similar.

  • Collaborate with Development, QA, Infrastructure, and Business teams to identify and resolve performance issues.

  • Support performance testing activities for applications built on the PEGA platform.

Requirements

  • Minimum 4+ years of hands-on experience in Performance Testing.

  • Strong expertise in LoadRunner Enterprise (LRE).

  • Practical experience with TrueClient scripting.

  • Strong experience with HTTP/HTML scripting.

  • Good understanding of API and microservices architecture.

  • Experience in performance testing of PEGA applications.

  • Strong analytical, troubleshooting, and problem-solving skills.

  • Good command of English.

Nice to have

  • Experience with monitoring tools such as Dynatrace, Sysdig, AppDynamics, Grafana, and Splunk.

  • Experience with CI/CD integration for performance testing.

  • SQL knowledge for backend validation.

  • Good communication and stakeholder management skills.

What we offer

  • Opportunity to work on complex enterprise-level systems.

  • Collaboration with experienced Development, QA, Infrastructure, and Business teams.

  • Work with modern performance testing and monitoring tools.

  • Project locations available in Gdańsk, Gdynia or Warsaw.

  • International working environment with English as the main project language.

  • Long-term cooperation.

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Warsaw, Poland

14,280 - 17,220 PLN

🏢 Summary: Manual Test Engineer role focused on backend systems, data validation, API testing, and SQL-based quality assurance in a mission-critical applications environment. The position involves manual testing, defect tracking, and close collaboration with Agile teams to ensure system reliability and product quality. On-site work model in Warsaw with opportunities to grow expertise in testing and backend analysis. 🗂️ Requirements: 3+ years experience as Manual Tester or QA Engineer, Strong SQL knowledge with complex queries, Experience testing backend systems or data-driven applications, Hands-on experience with relational databases, Ability to analyze business and technical requirements, Familiarity with Jira, Azure DevOps, or TestRail, Excellent test documentation skills, Understanding of testing techniques, Experience working in Agile/Scrum environments, Good command of English, Legal right to work in the European Union 📃 Skills: SQL, PostgreSQL, Oracle, MySQL, Jira, Azure, TestRail, REST, SOAP, Postman, Python, Java, Selenium, Scrum, Agile 🏢 Description: Unleash quality and precision — elevate software testing to the next level! Warszawa-based opportunity with on-site work model As a Test Engineer , you will be working for our client, a leader in delivering mission-critical business applications. You will play a vital role in ensuring the robustness of key systems through hands-on testing, data validation, and backend process analysis, contributing directly to product excellence and user satisfaction. This role offers a unique chance to grow your expertise in a dynamic and innovation-driven environment. Your main responsibilities: Plan, design, and execute manual tests (functional, integration, regression) to ensure system integrity Perform data validation, including checking data flows, transformations, and backend processing accuracy Write and execute complex SQL queries to validate data, investigate issues, and support testing activities Test APIs (REST, SOAP), analyze application logs, and database data to identify defects and root causes Create and maintain detailed test documentation such as test cases, scenarios, and reports Collaborate closely with developers, analysts, and Product Owners to clarify requirements and resolve issues efficiently Report and track defects throughout their lifecycle using Jira or similar tools Contribute to continuous improvement initiatives for testing processes and overall product quality Participate actively in Scrum ceremonies like PI Planning, Sprint Planning, and Daily Stand-ups You're ideal for this role if you have: 3+ years of experience as a Manual Tester / QA Engineer Strong SQL knowledge, capable of writing complex queries (JOINs, subqueries, GROUP BY) Experience testing backend systems or data-driven applications Hands-on experience with relational databases (e.g., PostgreSQL, MS SQL, Oracle, MySQL) Ability to analyze business and technical requirements effectively Familiarity with testing tools like Jira, Azure DevOps, or TestRail Excellent test documentation skills Good understanding of testing techniques (equivalence partitioning, boundary value analysis, etc.) Strong organizational skills and independence in work Experience working in Agile/Scrum environments It is a strong plus if you have: (optional) Basic knowledge of test automation tools (e.g., Postman, Python, Java, Selenium) Familiarity with CI/CD pipelines Language Required for the role: English – good command required Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.