Performance Tester - JMeter - Short-term Contract

• We are looking for a Senior Performance Tester 🔹

Location: Warsaw. Poland – remote, hybrid or on-site.
Start date: ASAP
End client: Polish public sector organization in the education field

Type of agreement: B2B contract, temporary assignment (4–5 months); no confirmed extension at this stage

With a focus on IT/OT, R&D, Engineering and Business Development, we deliver sustainable value through a holistic and independent approach to total talent management.

By providing comprehensive talent solutions, combined with vast industry experience and excellence in execution, we form successful collaborations. We bridge clients and partners & professionals throughout the talent supply chain, for the benefit of individuals, organizations and society.

We offer:

1. B2B agreement
2. Transparent working conditions with both Ework and the client
3. Current support during our cooperation
4. Possibility to work in an international environment
5. Collaborative environment in Swedish organizational culture

Zakres obowiązków

• Define the performance testing strategy — objectives, workload models, test scenarios, entry/exit criteria and acceptance thresholds
• Set up and maintain the performance testing framework for web applications, web services and supporting Windows Services
• Create and execute performance test scripts, analyzing and comparing them against real browser/application traffic (connection handling, session management)
• Design realistic workload models and recommend innovative performance testing approaches
• Run tests on the PROD environment within agreed maintenance windows, and analyze the results
• Design, configure and troubleshoot distributed load-generation environments across on-premises machines and Azure virtual machines, considering capacity, connectivity and security
• Manage test data and test environments, working with infrastructure teams to prepare and validate PREPROD/PROD environments hosted in external data centers
• Analyze application, database and infrastructure performance metrics, identify bottlenecks and prepare actionable recommendations

Wymagania

• Fluent Polish
• Experience in requirement analysis, test case design and test execution
• At least 6 years of hands-on performance testing experience
• Strong hands-on experience with Apache JMeter — maintaining, extending and executing performance test scripts
• Experience testing monolithic web applications built on .NET and Microsoft SQL Server, including Windows Services
• Practical knowledge of:
  - Microsoft SQL Server and SQL scripting
  - Windows and Windows Services
  - Infrastructure monitoring tools (Azure Portal, Grafana, Dynatrace or equivalent)
  - Shell commands (cmd, bash or PowerShell)
  - API testing tools (Postman, SoapUI or equivalent)
  - Web browser dev tools for performance analysis
  - Defect management tools (Azure DevOps, Jira)
• Knowledge of Playwright or another UI-level performance testing tool is a strong plus

Tech stack

• .NET
• JMeter
• SQL Server
• Powershell
• Performance Testing
• SQL
• Bash
• Azure DevOps
• Grafana