Senior QA Engineer – Freelance (Remote)

About the role

We are looking for a Senior QA Engineer to join intent on a freelance, time‑and‑material basis. You will work remotely with our fully‑remote team, testing mobile applications that communicate with connected devices over BLE and ensuring the overall quality of hardware‑software integration.

Key responsibilities

• Conduct compatibility testing across devices, sensors, gateways, protocols and platforms.
• Perform functional testing of data collection, storage, processing, real‑time monitoring and integrations.
• Execute performance testing under varying workloads, network conditions and physical environments to identify bottlenecks and latency.
• Carry out security testing of devices, communication protocols, data transmission and authentication mechanisms.
• Mentor junior testers and raise QA standards across the chapter.
• Participate in requirement discussions, flag inconsistencies early and share knowledge across the company.
• Integrate AI‑driven tools into daily testing workflows.

Required profile

• Enjoy digging into firmware logs and questioning specifications.
• Prefer ownership of your test areas and direct communication when issues arise.
• Curious about both the device hardware and the accompanying mobile app.
• Comfortable with flexible working hours and occasional evening calls with US clients.

Required skills

• Bluetooth Low Energy (BLE) communication testing.
• Firmware and mobile app testing expertise.
• Performance and security testing techniques.
• Proficiency with AI‑assisted testing tools.

What we offer

• Fully remote work with flexible hours (core 10:00‑18:00 CET).
• Potential path to a permanent contract with full benefits after a successful trial period.
• Pet‑friendly office in Warsaw and coworking space in Gdańsk for occasional on‑site work.
• Opportunity to work on cutting‑edge connected‑device projects for clients such as Oura and BOSE.