Live opening · Posted 3 days ago
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Description supplied by the original job listing.
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.
Fullstack Engineer (Mobile) — Own the app that captures the real-world data behind the largest AI and robotics models. Remote, France.
We're hiring on behalf of a fast-growing, YC-backed company that provides real-world training data to the world's leading AI and robotics labs. Its contributor base is scaling from 150K+ to 1M+ users.
You'll own the mobile app contributors use to record data every day, plus the backend it talks to, and jump onto other software projects as they come up. They hire builders, not specialists.
What You'll Do
→ Own the React Native app end to end: recording, sensor capture, uploads and App Store / Google Play releases
→ Write native capture code in Swift and Kotlin: camera, ARKit/ARCore, IMU sync, video encoding
→ Make multi-gigabyte recordings and uploads reliable on any phone, including budget Android devices
→ Build and scale the backend APIs and data flows behind the app
→ Ship features fast and decide what not to build
What We're Looking For
→ 3+ years as a software engineer, including 2+ shipping React Native in production on iOS and Android
→ Comfortable in native code (Swift, Kotlin) and backend APIs (Python/FastAPI)
→ Proof you're a builder: shipped apps, hackathons, side projects, active GitHub
→ Agentic engineering as a craft: parallel agents, a tuned harness, self-checking loops
→ Available to start within a month
→ Bonus: French, grande école background, video/sensor-heavy apps, startup or founder experience
What's on offer: €60,000–€80,000 ($70,000–$90,000) salary, fully remote (France ideal), and direct work with the founders and top AI labs.
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 — answering questions, adding context, and making sure you're never left guessing or ghosted.
We only post real jobs. Every role on TechTree is a live, active hire.
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