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C# Test Automation Engineer (f/m/x)

Sii Poland • Gdańsk, Pomeranian Voivodeship, Poland

onsitefull-time
Posted Oct 24, 2026Apply by Nov 23, 2026

**Role & seniority: ** Test Automation Engineer (mid-level, ~4+ years) for long-term banking project in an agile team

**Stack/tools: ** .NET; automated performance testing; API/Web services; GUI/front-end & mobile testing; databases; CI for automated tests; test automation frameworks; Git; ISTQB (Foundation-level)

**Top 3 responsibilities: **

  • Design/implement automated performance and other non-functional test scripts; execute tests and analyze results

  • Identify/report/verify/debug defects; validate quality based on metrics and recommendations

  • Maintain/improve automation frameworks; support CI and prepare/manage test data for environment/data dependencies

  • Must-have skills:

    • 4+ years test automation experience with .NET

    • Full-stack testing automation: front-end (GUI), mobile, middleware (APIs/web), back-end (databases)

    • Cross-environment automation execution; test best practices/methodologies (TDD, BDD, Page Object Model)

    • Git experience

    • English + Polish (written/spoken)

    • ISTQB Foundation knowledge (certified or planning within 3 months)

  • Nice-to-haves:

    • Experience with broader performance engineering practices and quality/risk mitigation activities

    • Familiarity with Scrum delivery workflows and test-related communication/impediment resolution

  • Location & work type: Not specified in provided text; international environment (languages Polish/English). Work type appears agile/Scrum and **p

Full Description

We are looking for a Test Automation Engineer to join a long-term banking project for a leading external client. You will become part of an agile team responsible for ensuring the high performance and stability of business-critical systems.

Your tasks

Designing and implementing automated performance test scripts Executing non-functional tests and analyzing test results Identifying, reporting, verifying, and debugging defects Reviewing requirements and technical designs from a testing perspective Maintaining, improving, and extending test automation frameworks Managing and preparing test data with an understanding of data dependencies Recommending actions based on test outcomes and quality metrics Collaborating with the agile Scrum team to ensure delivery quality Supporting continuous integration processes for automated tests Participating in risk mitigation, impediment resolution, and test-related communication

Requirements

Minimum 4 years of experience in test automation, specifically with .NET stacks Full-stack test automation experience (front-end - GUI, mobile), middleware (API/web services), and back-end (databases) Experience executing test automation across different environments and different test levels

Methodology and industry best-practice test automation knowledge: TDD, BDD, Page Object Model, etc. ISTQB foundation-level knowledge (certified or planning for certification within 3 months of joining) Git version control experience Fluent in written and spoken Polish and English - work in an international environment

Job no. JOB-LNEJ3

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

.NETAPI TestingBehavior-Driven DevelopmentC#Database TestingGitGUI TestingMobile TestingNon-Functional TestingPage Object ModelPerformance TestingTest AutomationTest Automation FrameworksTest Data ManagementTest-Driven DevelopmentWeb Services

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