Senior QA Engineer

13 hours ago

Remote Warsaw, Czech Republic Square One Resources Full time

What we expect 8+ years of QA experience, preferably in data engineering or backend systems.  Strong understanding of distributed systems, APIs, and streaming/batch data processing.  Hands-on experience with automated testing frameworks for APIs or data services.  Analytical mindset with strong problem-solving and debugging skills.  Excellent communication, autonomy, and proactive attitude.  Degree in Computer Science or related field is a strong plus.  Contract: Until end of 2026 (no extension) Start date: ASAP Recruitment process: HR/Tech interview Technical interview with client We’re looking for a highly skilled Senior QA Engineer (8+ years of experience) to take ownership of quality assurance for large-scale, headless data pipelines. In this role, you will design and implement testing strategies ensuring performance, scalability, and data integrity across distributed systems. This is a purely backend QA position - no UI testing, full focus on APIs, services, and batch/stream data flows. ,[Define and execute QA strategies for data pipelines, ensuring performance, reliability, and data consistency. , Build automated tests for headless services and APIs (batch/stream), covering contract, integration, and system-level scenarios. , Validate data correctness and consistency — idempotency, deduplication, schema evolution, CDC, and handling of late/duplicate events. , Design and run performance and load tests, identify bottlenecks (throughput, latency, backpressure, resource utilization). , Collaborate with engineering teams to improve observability, debugging, and quality metrics across data systems. ] Requirements: QA Engineer, Data pipelines, Quality assurance, Testing, QA, Automated testing, Data engineering

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