Senior API Tester – Automation & Backend Services

Warszawa, Poland 3 823.20 - 4 999.57 USD Posted on February 24, 2026

Job Description

Unleash the Power of Seamless Backend Connectivity — Revolutionize API Testing for Next-Level Software Excellence!

Warsaw-based opportunity with hybrid work model (up to 4 remote days per week)




As a Senior API Tester – Automation & Backend Services, you will be working for our client, a leader in innovative technology solutions. This pivotal role involves ensuring the quality, reliability, and robustness of backend services through advanced API testing. Your expertise will directly contribute to delivering cutting-edge software that shapes the future of digital interactions and innovations.




Your main responsibilities:

Design, implement, and maintain automated REST API tests to optimize testing workflows

Collaborate with developers, analysts, and testers to improve backend testing processes

Develop and enhance testing frameworks using Java and tools like Rest Assured

Write complex SQL queries for data validation and integrity checks

Integrate testing solutions with CI/CD pipelines such as Jenkins and GitLab CI

Document test cases and results utilizing Jira, TestFLO, and Confluence

Execute and analyze integration tests to identify and resolve issues

Contribute to the continuous improvement of testing methodologies and tools




You're ideal for this role if you have:

Minimum 5 years of experience in test automation, specifically with backend/API testing

Strong proficiency in Java, including framework development and maintenance

Hands-on experience testing REST APIs using Rest Assured or similar tools

Solid knowledge of SQL for data validation

Practical experience with GIT version control

Familiarity with CI/CD tools such as Jenkins and GitLab CI

Experience with Jira, TestFLO, and Confluence for test management

Familiarity with Maven or Gradle for project automation

Proven ability to develop and execute robust integration tests




It is a strong plus if you have:

Experience developing performance testing scripts with Gatling (Java)

Knowledge of load, stress, and endurance testing techniques

Understanding of microservices architecture

Familiarity with Postman, Swagger, and API mocking tools




Language Required for the role:

Good command of Polish (spoken and written)




Eligibility for the role:

Only candidates with an existing legal right to work in the European Union will be considered for this role.




#MAKEYourCareerBETTERInterested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

About ITDS

We're ITDS, a leading business consultancy and IT engineers outsourcing firm specializing in Software Development, Data Engineering, Cloud/DevOps Engineering, Cybersecurity, and AI. We're here to take the world by storm! Our service offering goes beyond just Staff Augmentation; we also offer Managed Capacity, Managed Services, and Managed Outcome, making us your comprehensive partner in tackling complex IT needs. With offices in Amsterdam, Warsaw, Wrocław, Lisbon, and Porto, we're on the move and constantly evolving. Our team of over 600+ highly motivated specialists combines our wealth of experience with in-depth knowledge of new technologies, legislation, and digital marketing to help our clients reach the next level. Speaking of clients, we work with some of the biggest names in the business - from financial services providers and fintech companies to eCommerce giants, healthcare firms, and many more. Together with our clients, we are putting the digital future into practice by building excellent consulting & project delivery teams. But it's not all work and no play at ITDS. We've got a great spirit and a commitment to excellence that's earned us prestigious awards like the Forbes Diamond and the Great Place to Work title. And as one of the 1000 fastest-growing companies in Europe according to the Financial Times, we're always looking for new opportunities to grow and evolve. Plus, as part of the House of HR group that employs over 70,000 professionals across Europe, we're constantly expanding our horizons and providing endless opportunities for growth and development to our people and clients. At ITDS, we're proud of what we stand for, and we're always striving to make IT better. So if you're looking for a team that's always on the move and never content with the status quo, come to talk to us, and let's take on the world together! #ITDS #BusinessConsultancy #ITEngineersOutsourcing #GetReady #makeITbetter #JoinUs #OpportunitiesForGrowth

Industry: Business Consulting and Services