Senior Test Automation Engineer C#, .NET, Playwright, Selenium, Git, GitHub Copilot Gdańsk

Diverse CG Sp. z o.o. Sp.k.; Województwo pomorskie; On-site; PLN 111,600 - 167,400; Full time

Benefits offered by this job

Private medical care

Co-financing for the sports card

Constant support of dedicated consultant

Job summary

Diverse CG Sp. z o.o. Sp.k. is looking for a Senior Test Automation Engineer in Poland, Województwo pomorskie. This role involves owning and scaling automated test suites for C#/.NET solutions, designing and maintaining test automation for UI and APIs, and integrating these within CI/CD pipelines. Ideal candidates will have over 5 years of test automation experience, strong skills in C# and .NET 8, and proficiency in UI testing using Playwright/Selenium. Benefits include private medical care and sports card co-financing.

Qualifications

• 5+ years of experience in test automation within .NET‑based stacks.
• Strong hands-on experience with C# and .NET 8 test code.
• Solid experience in UI test automation using Playwright and/or Selenium.

Responsibilities

• Own and scale automated test suites for a C# / .NET 8 solution.
• Design, implement, and maintain test automation for UI and APIs.
• Integrate and maintain test automation within CI/CD pipelines.

Skills

C# modern features

Test automation frameworks (NUnit)

UI test automation (Playwright/Selenium)

API test automation (HttpClient/RestSharp)

JSON validation and schema checks

Behavior Driven Development (SpecFlow/ReQNRoll)

CI/CD automation

Git version control

Failure analysis and debugging

Manual testing willingness

English proficiency

Job description

Senior Test Automation Engineer

• Own and scale automated test suites for a C# / .NET 8 solution
• Design, implement, and maintain test automation for UI and APIs
• Perform UI automation using Playwright / Selenium with Page Object Model
• Implement API automation, including request handling, JSON validation, and schema checks
• Apply BDD practices using SpecFlow or ReQNRoll
• Design and maintain test architecture, including reusable helpers, stable selectors, and flakiness handling (retry/backoff)
• Integrate and maintain test automation within CI/CD pipelines (Bitbucket / Bamboo)
• Perform failure diagnostics and debugging of automated tests
• Conduct manual testing when required, based on project needs
• Collaborate within the team to ensure test quality and stability

Requirements

• Strong hands‑on experience with C# (modern language features) and .NET 8 test code
• Experience with test frameworks such as NUnit and test runners
• Solid experience in UI test automation using Playwright and/or Selenium
• Experience in API test automation using HttpClient and/or RestSharp
• Knowledge of JSON validation and schema checks
• Practical experience with BDD (SpecFlow / ReQNRoll)
• Experience in designing robust test automation architecture
• Hands‑on experience with CI/CD automation (Bitbucket, Bamboo)
• Strong Git knowledge, including code reviews and test pipeline maintenance
• Experience in failure analysis and debugging
• Willingness to perform manual testing when required
• Very good command of English, both spoken and written
• 5+ years of experience in test automation within .NET‑based stacks

Nice to have

• Experience using GitHub Copilot

Offer

• Private medical care
• Co‑financing for the sports card
• Constant support of dedicated consultant