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Sii Poland • Piła, Holy Cross Voivodeship, Poland
Role & seniority: Senior Performance Tester
Location & work type: Poland-based (office/onsite or hybrid not specified); full-time
Performance testing tools: JMeter, Locust, Gatling, NeoLoad, LoadRunner
APM tools for result collection
CI/CD tooling; version control (Git, SVN)
SOA/API/JSON understanding; Linux and Windows performance tuning
Programming: JavaScript, Python, Scala, or C#
Windows/Linux environments
Design, plan and execute next-generation performance tests; build and maintain the performance testing environment
Create and optimize automated testing processes; integrate with CI/CD and automated analysis
Collect results, perform root cause analysis, propose performance indicators, and report findings
4+ years in automated testing; ≥1 year in performance testing
Proficiency in one or more of JavaScript, Python, Scala, or C#
Experience with Git or SVN; CI tools (e.g., Jenkins)
SOA/API knowledge and JSON proficiency
Linux/Windows performance tuning; strong analytical/problem-solving abilities
Excellent English for communication and documentation
Hands-on experience with APM tools and end-to-end performance automation
Experience across diverse client projects; mentoring or peer knowledge sharing
Familiarity with performance testing metrics, dashboards, and reporting
Note: Company brands itself as Great Place to
Join the team of the largest Testing Services Center in Poland, created by testers for testers, in a company regularly awarded with Great Place to Work awards. We offer interesting projects and constant access to knowledge thanks to the training platform, webinars, and exchange of experiences within our Community, as well as development under the supervision of mentors. We are currently looking for a Performance Tester to join our team. The ideal candidate will bring strong expertise in performance testing methodologies, coupled with a solid technical foundation and an analytical mindset. If you are passionate about ensuring software efficiency and reliability, we want to hear from you!
Your tasks
Creating Innovative Next-Generation Performance Tests Planning and implementing tests Building a performance testing environment Preparing scripts using chosen tools, such as JMeter, Locust, Gatling, NeoLoad, and LoadRunner Collecting results with the use of APM Tools Building automated analysis mechanisms Conducting the full automation process using CI/CD tools, APM tools, Performance Testing tools, and automated analysis Participating in demanding projects for clients from various sectors Proposing performance indicators Performing root cause analysis of performance problems
Requirements
At least 4 years of experience in automated testing, at least 1 year of performance testing
Good knowledge of one or more programming languages: JavaScript, Python, Scala or C# Proficiency with Version Control Systems such as Git or SVN Understanding of Service-Oriented Architecture (SOA), API technology, and JSON structure Linux and Windows performance tuning experience Experience with Continuous Integration tools (e.g. Jenkins) Ability to design and implement efficient tests Solid understanding of the performance testing methodology and tools Sharp, analytical mindset with strong problem-solving abilities Very good command of English for effective communication and documentation
Job no. 260211-TDIWA
Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.
Benefits For You
Great Place to Work
Solid financial situation
Contracts with the biggest brands
Centre of internal trainings
Many experts you can learn from
Open and accessible management team
Profit sharing
Passion Sponsorship program
Regular integration events and trips
Comfortable and well-equipped offices
MySii app
Medical care