Senior QA Engineer (Mobile & IoT)

Quick Facts

Freelance Senior QA Engineer role focused on Mobile & IoT projects. Work is fully remote with flexible hours (core hours 10:00–18:00 CET).

Description

We’re looking for a Senior QA Engineer to contribute testing expertise to ongoing mobile and IoT engagements. You will build testing approaches and perform compatibility, functional, performance, and security testing for connected-device ecosystems. After a few months, there may be an opportunity for long-term collaboration with the internal team.

Responsibilities

• Compatibility testing to ensure interoperability between IoT devices, sensors, gateways, protocols, and platforms
• Functional testing of IoT application features such as data collection, storage, processing, real-time monitoring, control, and integrations
• Performance testing across workloads, network conditions, and environmental factors to identify bottlenecks and scalability limits
• Security testing to identify and mitigate vulnerabilities in devices, communication protocols, data flows, access controls, and authentication
• Estimate work and participate in requirement discussions and daily calls
• Provide feedback on inconsistencies and open issues
• Mentor less experienced team members and support knowledge sharing

Requirements

• At least 4 years of professional experience as a mobile tester
• Experience with IoT testing (firmware, OTA, device connectivity, hardware–software interaction)
• Familiarity with IoT protocols: Bluetooth, BLE, NFC, Wi‑Fi, Thread
• Ability to build testing approach and test cases from scratch
• Practical understanding of hardware workflows (firmware updates, pairing, resets, failure scenarios)
• Experience with test case management tools (TestRail, Qase) and Atlassian tools
• B2 English skills (written and spoken)
• Self-reliance, responsibility, effective time management, and team collaboration

Benefits

• 100% remote work
• Flexible working hours with core hours between 10:00 and 18:00 CET (some client meetings up to 20:00 CET, ~2 per week)
• Potential long-term internal collaboration after a few months, including paid holidays, paid sick leave, and a training budget