Senior QA Engineer

Location: Off-site

Security Clearance Not required

Reference No VS/CMRE-49 / Off-site

Deadline For Application 03/06 /2026

Skills, Knowledge, Experience Required

• 5+ years of QA experience ;
• Strong hands-on Python experience for test automation ;
• Strong hands-on experience with pytest ;
• Strong experience testing MQTT or other message broker-based systems ;
• Proven experience designing and executing end-to-end tests for asynchronous workflows and multiple interacting services ;
• Strong practical experience with Docker Compose, including independently starting and troubleshooting local environments ;
• Experience embedding automated tests into CI/CD pipelines ;
• Strong backend and integration testing experience ;
• Experience debugging failures across distributed systems, including logs, service interactions, and environment setup ;
• Ability to work autonomously and contribute immediately with minimal ramp-up ;
• Clear written and verbal communication skills .

Desirable :

• Direct experience testing MQTT-based applications ;
• Experience with API and service-level testing ;
• Experience validating database state where needed ;
• Familiarity with logs, observability tools, and debugging in distributed environments .

Duties/role :

• Defining practical test plans for backend, integration, and end-to-end testing across multiple services ;
• Identifying test scope, critical flows, edge cases, and success criteria together with developers and stakeholders ;
• Focusing test coverage on asynchronous workflows, broker-based communication, service interactions, and regression risk ;
• Helping establish lightweight, effective QA practices improving confidence in releases without unnecessary process overhead ;
• Designing, building, and maintaining automated tests in Python using pytest ;
• Creating end-to-end and integration test coverage for MQTT or other message broker-based communication patterns ;
• Validating asynchronous workflows involving multiple services, including message publishing, consumption, retries, timeouts, and error handling ;
• Independently spinning up, managing, and troubleshooting local test environments using Docker Compose ;
• Executing manual and exploratory testing where useful, especially around timing issues, race conditions, and multi-service failure scenarios ;
• Validating service behavior through APIs, broker interactions, and data checks where relevant ;
• Ensuring automated tests are reliable, maintainable, and suitable for execution in delivery pipelines ;
• Documenting, tracking, and communicating defects clearly, including reproduction steps, impact, and supporting evidence ;
• Investigating issues across logs, containers, broker traffic, and service interactions ;
• Working closely with developers to reproduce problems, verify fixes, and confirm resolution ;
• Providing clear feedback on quality risks, test coverage gaps, and release readiness ;
• Supporting the integration and ongoing maintenance of automated tests in CI/CD pipelines .

Additional information: If you are interested, for further information, please contact the point of contact for this offer. VECTOR SYNERGY sp. z o.o., ul. Marcelińska 90, 60-324 Poznań, NIP PL7811857270, REGON 301575740, KRS: 0000369575

Rejestr Przedsiębiorców KRS prowadzony przez Sąd Rejonowy Poznań – Nowe Miasto i Wilda w Poznaniu, VIII Wydział Gospodarczy KRS, kapitał zakładowy wynosi: 73.852,80 złotych wpłacony w całości, TEL +48 616684500, FAX +48 616684501, www.vectorsynergy.com , [email protected]