Senior QA Engineer

We're looking for you if:

• Senior Quality Mindset: You don't just find bugs after deployment—you anticipate failure modes, define quality standards, and prevent issues upstream.
• Automation Depth: Hands-on experience with Playwright and Karate (or similar modern frameworks) for API, UI, and E2E test automation.
• Data & Integration Testing: Comfortable testing distributed systems, SQL databases, Kafka queues, APIs, ETL pipelines, and file exchanges.
• Broad Testing Scope: Practical experience spanning functional, performance, and security testing.
• AI-Curious in QA: Active interest or hands-on experience using AI assistants to write scripts, generate edge-case tests, and analyze coverage.
• Pragmatic Engineer: You know when to build a rock-solid automation framework and when light validation is enough to keep development velocity high.

Bonus points

• Experience with system migrations, data parity verification, or platform unifications.
• Penetration testing or security auditing experience.
• BDD experience (Cucumber / Gherkin).
• Transport, logistics, or telematics domain experience.

Senior QA Engineer

Quality Guard · API + UI + E2E · Performance & Security · AI in Test Automation

At CO3, we are standing up a new engineering team to take technical ownership of a live, active logistics platform integrated into our ecosystem. We need a Senior QA Engineer who is tired of being a passive "ticket-closer" and wants to act as a true Quality Guard — someone who deeply understands existing platform behaviour, prevents bugs before they hit production, and leads quality strategy through system modernization and unification.

Why this role?

• Real Platform Evolution: Take ownership of a live production platform—understanding its current integration layer, maintaining production reliability, and modernizing the stack into CO3’s core architecture.
• Genuine Ownership: Integrations, cloud infrastructure, engineering standards, and the unification strategy are yours to participate in and execute.
• Scale & Ecosystem Variety: Hundreds of active integrations across the logistics ecosystem, handling high throughput and complex data feeds.
• Beyond Basic CRUD Apps: Test complex, high-throughput systems—Kafka streams, telematics feeds, ETL pipelines, and batch file transfers—deeply intertwined with heavy, non-trivial domain logic that actively processes and transforms this data.
• True Autonomy & Scope: Drive quality end-to-end across API, UI, performance, security, and data integrity rather than sitting in a narrow testing silo.

Your mission

• Deconstruct & Guard: Deeply understand existing platform behaviours, edge cases, and data flows to prevent regressions during ongoing maintenance and unification.
• Automate Across the Stack: Build and maintain robust automated test suites (API, UI, E2E) using modern frameworks like Playwright and Karate.
• Verify Complex Data Pipelines: Test diverse integration flows—REST APIs, Kafka streams, ETL batches, and file-based data processing—ensuring end-to-end data integrity.
• Performance & Security: Treat performance and security testing as first-class citizens, verifying system resilience under high logistics data volumes.
• Adopt AI in QA: Integrate AI tooling into test generation, maintenance, and edge-case analysis to accelerate QA workflows.
• Embed Quality Upstream: Collaborate closely with Tech Leads and Devs before code is even deployed to ensure testability and architectural quality ("shift-left" mindset).

What's in it for you

• • True Product Ownership: One evolving logistics platform with long-term vision—no body-leasing or agency setup, with a candid, "No-BS" culture.
  • High Technical Impact: Your quality strategy directly ensures the reliability of European logistics data streams.
  • Modern Stack & AI-Native Culture: Kafka, cloud infrastructure, event-driven architecture, high data volumes and AI integrated into daily workflows.
  • Flexibility: Remote-first across Poland with an optional Wrocław office setup (Powstańców Śląskich).

,[] Requirements: Testing, AI, Cloud, Security, Kafka, Integration, Ownership, REST API, ETL, Spring, API, Test automation, Test management, Manual tests, Postman, Java, Playwright, Karate, Logistics, UI design, UX data analysis, User acceptance testing Tools: Confluence, GitHub, GIT, Agile, Kanban.