Senior Software QA Engineer

What We’re Looking For We're looking for a highly driven Senior Software QA Engineer to own the quality strategy for the software that flies our quadcopters, not just execute individual test cases. In this role, you'll decide what "tested" means for a given release, design the test architecture that gets us there, and make the call on whether a build is ready to fly. This is a senior individual-contributor role with technical leadership scope, setting direction for how the team tests while staying hands-on enough to build the hardest test rigs and debug the hardest failures yourself. The day-to-day Test strategy: define and own the overall test strategy across unit, integration, system, SIL, HIL, and flight test levelsTraceability: establish and maintain requirements-to-test traceability for safety- and mission-critical functionalityTest infrastructure: architect and evolve simulation-based and hardware-in-the-loop test infrastructure so it scales with system complexityRoot-cause leadership: lead investigation of the hardest test failures and field anomalies across perception, GNC, middleware, and platform layersQuality gatekeeping: set and enforce the quality bar for releases, defining go/no-go criteria and communicating risk to stakeholdersMentorship: mentor QA and software engineers on test design, automation practices, and root-cause debugging You should apply if you bring 5+ years of software QA/test engineering experience, including test strategy and architecture ownershiphave strong skills in Python and C++, with the ability to build test infrastructure, not just consume ithave a deep understanding of requirements-based test design and traceability for safety-relevant softwarehave practical experience with software-in-the-loop and/or hardware-in-the-loop testing on embedded Linux targetscan independently root-cause complex, cross-layer issues from perception and GNC logic down to hardwarehold a degree in computer science or a comparable field – or equivalent hands-on experience that speaks louder than the diplomafluent in English; German is a plus Nice to haves Autopilot testing: experience testing autopilot/flight-controller software such as MAVLink/PX4 or other real-time control systemsPerception exposure: exposure to TensorRT or vision-based perception components and their validation challengesFlight test campaigns: experience designing test procedures, analyzing logs/MCAP, and reporting pass/fail criteria What We Offer Real impact & ownership: Shape high-tech defense systems and take responsibility from day oneMission-driven environment: Work on technologies that matter for European security and sovereigntyCompetitive package: Competitive salary, EGYM Wellpass, corporate benefits, and equity options aligned with role and levelDeep tech environment: Get hands-on experience with cutting-edge drone technology and real operational use casesGrow fast: Steep learning curve for juniors, strategic influence and leadership opportunities for seniorsStartup mindset meets defence innovation: flat hierarchies, fast decisions, and space for your ideas.Flexibility: Flexible hours, remote options, and relocation supportStrong team: International, driven colleagues and a culture built on exchange, trust, and shared success About Us Twentyfour Industries is committed to building a fair, inclusive, and high-performance workplace where people from all backgrounds can contribute and thrive. Our team brings together individuals with different perspectives, experiences, and skills to shape the future of European security and technology. All applicants will receive equal consideration for employment regardless of gender, age, disability, ethnic or social origin, religion or belief, sexual orientation, or any other status protected by applicable European or national law. We particularly welcome applications from individuals who are underrepresented in the technology and defense sector, including women, people with disabilities, and those from diverse cultural backgrounds. We aim to provide a respectful, supportive, and transparent recruitment process. If you require adjustments to take part in our hiring process, please let us know so we can accommodate your needs. If you share our mission and are motivated to work on challenges with real-world impact, we look forward to your application.