Founding AI Engineer (+ Equity) at stealth-mode European defence startup

This is a role that TechTree is recruiting for on behalf of one of our clients. TechTree is an AI-driven recruitment platform working with high-growth companies. When you apply, our AI Agent matches you not just to this role, but to other relevant opportunities across our network, so one application can unlock multiple roles. About The Role We are seeking a Founding AI Engineer to develop real-time speech-to-text systems for military and emergency services. This role is based in Paris or Warsaw and focuses on Python development. As a founding team member, you will work directly with the founders to evolve our early stack and service our first customers in demanding environments. What You'll Be Doing Develop bespoke real-time speech-to-text systems primarily in PythonWork directly with founders to evolve the early stackService military and emergency services units in resource-constrained environmentsBuild systems that are quickly deployed and used in the fieldOwn projects end-to-end, making real decisions and moving fast What We're Looking For Experience with implementing Voice AI systems in resource-constrained environmentsComfortable with audio processing and low-latency systemsStrong execution skills and a product-focused mindsetAbility to thrive in ambiguous, fast-moving environmentsPurpose-driven with a desire to have real-world impact Compensation & Benefits Salary: €60,000 – €110,000 depending on experienceMeaningful equity as a founding team memberRelocation sponsorship available for candidates About The Company This organization is a European defence startup based between Paris and Warsaw, focused on creating modern software for hostile environments. Recognized as one of France’s top 20 seed companies, they are backed by leading VCs and strategic partners, including founders of Quantum Systems and ElevenLabs. The team is composed of experts from leading tech companies, special forces, and defence-sector PhDs. What is TechTree? TechTree combines AI agents with a human support team to give candidates a better, more transparent hiring experience. Our AI Agent gets to know your background, experience, and what you're optimising for. It continuously matches you to live roles across our network where there's genuine alignment, not just keyword overlap. Our Human Team is there to support you through the process: Answer questions about roles, process, and next stepsAdd context when something in your background isn't obviousHelp unblock stalled processes or unclear feedbackMake sure you're not left guessing, ghosted, or wasting time We only post real jobs. Every role on TechTree is a live, active hire. If you apply: you'll be considered for this role, you may also be matched to other relevant roles, and if there's no fit, we won't spam you.