Engineering Bulletproof Quality Through Test Automation
Hi, I'm Marcin Celejewski — a Senior Test Automation Developer with over 6+ years of experience designing robust test frameworks, BDD pipelines, and continuous testing architectures for medical devices, automotive systems, and telecom radio infrastructure.
Marcin Celejewski IT
B2B Software Quality Assurance & Engineering
Bridging High-Quality Software & Automated Engineering
I am a results-oriented Senior Test Automation Developer and consultant based in Wrocław, Poland. With an M.S. in Computer Science and years of commercial experience in cutting-edge industries, I help teams build rock-solid software quality infrastructure.
My expertise spans the entire automation lifecycle: from authoring readable BDD test specifications and scalable testing frameworks to orchestrating seamless CI/CD test lines and ensuring strict compliance with ISO medical device regulations and telecommunication standards.
Eliminating flaky tests, accelerating release cycles, and boosting regression confidence.
Experienced in Scrum board management, team mentorship, and cross-functional alignment.
What I Bring to Your Projects
Delivering high-reliability test automation architectures, CI/CD DevOps integration, and engineering excellence.
End-to-End (E2E) & UI Automation
Design, implementation, and maintenance of scalable automated test suites for modern web applications using Playwright, Selenium, Python, and TypeScript.
- Cross-browser & responsive UI testing
- Parallel & distributed test execution
- Stable, maintainable test architectures
API & Integration Testing
Comprehensive automated testing of REST APIs, backend services, and microservices to ensure data accuracy, business logic correctness, and fast feedback.
- REST & GraphQL API test automation
- Microservices & integration validation
- Payload, schema & status verification
Database & Backend Testing
Verification and validation of database integrity, backend transactions, and data workflows using automated SQL queries and validation scripts.
- SQL & database test automation
- Data consistency & migration checks
- Automated test data generation
CI/CD & DevOps Pipeline Setup
Setting up and maintaining continuous testing pipelines in Jenkins and Azure DevOps, enabling automated test execution on every commit and pull request.
- Jenkins & Azure DevOps pipeline configuration
- Automated build triggers & test gating
- Test reporting dashboards & instant alerts
BDD & Quality Engineering
Transforming requirements into readable, executable specifications based on Behavior-Driven Development to align developers, QA, and stakeholders.
- BDD scenarios (Behave, Cucumber, Gherkin)
- Living documentation & traceability
- Regression suite design & optimization
QA Consulting & Agile Leadership
Establishing comprehensive test strategies, leading agile QA workflows in Scrum, and mentoring teams to elevate engineering and testing standards.
- QA strategy & test coverage planning
- Scrum board & sprint QA management
- Flaky test diagnostics & code quality audits
Work Experience & Track Record
A proven history of building automated testing ecosystems for industry leaders.
Senior Test Automation Developer
Qiagen
Leading test automation efforts for an automated DNA/RNA purification instrument in compliance with stringent medical device standards.
- Authored test cases and technical documentation based on the BDD (Behavior-Driven Development) methodology for automated DNA/RNA purification instruments.
- Architected, developed, and maintained robust test automation frameworks ensuring high stability and coverage.
- Executed comprehensive software verification according to ISO medical devices standards.
- Managed Scrum board preparation, sprint planning, and agile QA workflows.
Test Automation Developer
Tietoevry
Developed test suites for complex web applications serving the automotive industry with continuous integration.
- Created and maintained automated end-to-end tests for modern web applications tailored for the automotive sector.
- Maintained continuous integration systems, implemented automated reporting, and triaged critical regression issues.
- Served cyclic leadership roles over the Scrum team to drive delivery quality and team productivity.
Test Automation Developer
Nokia Networks
Engineered internal test frameworks and automation suites for mobile network base station radio modules.
- Developed and maintained an internal automated test framework for mobile network radio modules software.
- Performed end-to-end integration, verification, and root-cause troubleshooting of automated test suites.
- Maintained active supervision over the Continuous Integration software delivery line and pipeline health.
IT Consultant
Wrocław University of Science and Technology
Applied Artificial Intelligence techniques for historical gazetteer digitization and automated data generation.
- Executed digitization and text recognition of the Silesian gazetteer utilizing artificial intelligence models.
- Designed and implemented standardized automated data generation pipelines.
Technical Expertise & Background
Proficiencies acquired and sharpened through real-world commercial projects.
Automation & Testing Tools
DevOps, CI/CD & Environments
Education
M.S. in Computer Science
Wrocław University of Science and Technology (Politechnika Wrocławska)
Comprehensive computer science curriculum with strong emphasis on software engineering, algorithms, architectures, and system verification.
Languages & Methodologies
Personal Interests
Let's Connect & Collaborate
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