Senior Test Automation Engineer – API & CI/CD

Billennium; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

Billennium is seeking an experienced Test Automation Engineer to join a long-term project for a leading healthcare organization. You will design and develop automated tests for integration platforms and ALM tool mappings, validate REST APIs, and verify JSON payloads and data flows, ensuring quality across complex integrations.

You will build test reporting with Allure, integrate tests into GitLab/GitHub CI/CD, and support manual testing when needed, while creating technical documentation.

Qualifications

• 5+ years of commercial experience as an Automation Test Engineer.
• Proven experience in automated testing of integration platforms, ALM tools, or enterprise applications.
• Hands-on experience with API Testing (REST, synchronous and polling-based data flows).
• Experience validating and troubleshooting integrations between tools such as Codebeamer, Jira, Azure DevOps (ADO), or similar platforms.
• Strong understanding of data serialization and validation (JSON, Jackson).
• Solid knowledge of XML technologies, including XSLT and XML Schemas (XSD).
• Experience with test reporting frameworks (Allure).
• Experience working with CI/CD pipelines (GitLab or GitHub).
• Ability to create and maintain test documentation.
• Fluent communication skills and willingness to collaborate with stakeholders.

Responsibilities

• Design and develop automated tests for integration platforms and ALM tool mappings.
• Validate REST APIs and synchronous/polling data flows.
• Verify and validate JSON payloads, serialized data, and business rules.
• Work with XML schemas and XSLT transformations.
• Build and maintain test reporting using Allure.
• Integrate automated tests into GitLab/GitHub CI/CD pipelines.
• Support manual testing activities when required.
• Create and maintain technical documentation.

Skills

Automation Testing

REST API Testing

CI/CD

Test Strategy

Documentation

Tools

Codebeamer

Jira

Azure DevOps

XML/XSD

Allure

GitLab

GitHub

Job description

Billennium is seeking an experienced Test Automation Engineer to join a long-term project for a leading healthcare organization. You will design and develop automated tests for integration platforms and ALM tool mappings, validate REST APIs, and verify JSON payloads and data flows, ensuring quality across complex integrations.

You will build test reporting with Allure, integrate tests into GitLab/GitHub CI/CD, and support manual testing when needed, while creating technical documentation.