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About the company and the role At Lendurai , we enable unmanned aerial vehicles (UAVs) to operate independently of global navigation satellite systems and radio control, using computer vision and machine learning. We partner with multiple UAV manufacturers to deliver cost-effective capabilities to public sector and defence customers. Our team has deep experience in aerospace engineering, defence tech, and autonomous systems, with backgrounds at companies like Bolt (EE), Open Cosmos (UK), and Starship Technologies (EE). As a Control-Systems Engineer you will own the algorithms that keep our drones stable, responsive, and mission-capable without satellite guidance. What you will be doing Design, implement, and tune real-time flight-control algorithms (attitude, position, and trajectory loops) targeted at GNSS-denied missions. Develop high-rate state-estimation and sensor-fusion pipelines that blend IMU, barometer, optical flow, VIO, and SLAM data. Port and optimise these pipelines on flight computers (Jetson Orin, Raspberry Pi CM5, i.MX 8M plus) under real-time constraints. Extend and customise PX4 or write bare-metal control stacks where needed. Create Software-in-the-Loop (SITL) and Hardware-in-the-Loop (HITL) test environments; iterate rapidly between simulations and field flights. Instrument test vehicles, run flight campaigns, and mine logs to improve robustness in wind, vibration, and electromagnetic interference. We are looking for Core skills Applied math: linear algebra, calculus, probability. For working with the flight controller’s EKF. C++20: knowledge of the memory and concurrency models of the language. Control fundamentals: PID, cascade loops, filters, estimation. Time and frequency domains. System identification methodology. Useful additional skills Knowledge of PX4/Ardupilot and concepts like SITL, MAVLink protocol. Experience working with sensors - sampling rates, synchronisation, filtering, fusing. Experience in any: machine learning, data analysis, signal processing, IoT Works in UNIX-based environment (Raspberry PI, Jetson, Desktop Linux or MacOS) What we offer Monthly gross salary €4,000-6,500 based on experience and impact Stock options A mission-driven team that values ownership, curiosity, and a hands-on approach to solving defense challenges Early technical influence in a growing defense tech startup A focus on outcomes Join Lendurai to be part of the forefront of defence technology innovation.