Field Engineer

About the Position

Autonomy in Every Drone

The Fourth Law (Четвертий Закон) - a leading Ukrainian manufacturer of drone autonomy technologies. The company’s solutions are codified to NATO standards and are used by more than 50 units of the Defense Forces of Ukraine and 20+ drone manufacturers. Our products bear the names of Ukrainian figures of the Executed Renaissance and the Sixtiers - Vasyl Stus, Olena Teliha, Mykola Zerov and Anatolii Lupynos.

In 2026, the company received an award from DOU as the most promising project in the defense technology sector.

Role mission: To ensure reliable deployment and validation of autonomous platforms in real-world conditions - from integrating the software stack onto partners’ hardware platforms to field testing and training end users.

You will join the Interceptor team, which is responsible for tools and solutions for intercepting aerial targets.

Responsibilities

• Field validation: Testing software products, verifying communication stability and the correctness of AI algorithms in real-world scenarios.
• Technical support: Promptly resolving faults at the hardware-software interface level and configuring systems for specific customer conditions.
• System integration: Technical support for testing and integrating the software stack onto our and our partners’ hardware platforms - both remotely and directly at deployment sites.
• Data collection and analysis: Executing test plans to verify system parameters and radio channel reliability, and documenting results for the R&D team.
• Partner training: Conducting technical demonstrations and training partners in operating and maintaining the systems.

Requirements

• Experience in system integration of complex hardware and software systems.
• Experience setting up and maintaining FPV copters and/or fixed-wing drones.
• Mobility and willingness to travel frequently. A driver’s license is required for transporting equipment.
• Ability to make technical decisions quickly and troubleshoot faults in non-standard conditions.

Nice to Have

• Experience with drone protocols and tools: Betaflight, Ardupilot, MAVLink, ELRS, VTX/VRX, digital video, QGroundControl/Mission Planner.
• Linux skills at the level of configuration and terminal navigation.
• Understanding of how electronics and interfaces work (UART, CAN, MIPI-CSI).

We Offer

• Work that makes a real impact. We create products that directly strengthen Ukraine’s defense capabilities.
• Work with top engineers in MilTech and autonomy.
• Official employment in Diia City.
• Possibility of reserving military-obligated employees in accordance with current legislation.
• Voluntary health insurance after completing the probation period.
• Annual paid leave - 24 calendar days.
• Veterans are entitled to additional paid leave - 14 calendar days.
• Paid sick leave in accordance with the law.
• Possibility of reimbursement of training expenses in accordance with the company’s internal policies.

We are looking not for executors, but for like-minded people who share our values and are ready to build the future of Ukrainian MilTech.

About the Company

The Fourth Law / TFL / Четвертий Закон

We work for those who protect us

Also visit our sister company Odd Systems. They produce thermal cameras and FPV drones