Senior Software Engineer

Own the app at Saef, the part of the product every customer touches. The role The Saef app is how someone confirms, from a hotel room in another country, that the most valuable object they own is safe. As Senior Software Engineer at Saef, you own the app feature set end to end. You’ll work alongside the senior web developer and the hardware team, iterating in parallel with hardware and cloud releases. This is a hands-on senior role with real ownership, not a management layer above other engineers. What you’ll do Design, build, and ship core app features end to endIntegrate the app with hardware (firmware, BLE connectivity) and the cloud backendIterate quickly alongside web and hardware release cycles, keeping the product demo-ready at all timesMake pragmatic architecture calls and help freeze a stable product architecture as the team scalesBuild with security and privacy by design; protecting wearer data is treated as an existential priority What we’re looking for 5+ years shipping production mobile applications to real usersProficiency with modern mobile development: native (Swift / Kotlin) or cross-platform (Flutter / Dart or React Native), plus a modern backend language such as TypeScript/Node, Python, or GoComfort working close to hardware: BLE, device pairing, real-time dataCloud fluency enough to integrate cleanly with platform servicesA bias toward shipping over debating, paired with sound engineering judgmentEffective in a small, in-person, high-trust team Nice to have Experience in consumer hardware, wearables, or IoTExposure to luxury, premium, or trust-sensitive productsInterest in on-device ML or edge computing What you'll get Real responsibility from day one in a small, senior teamOwnership of the firmware at the core of the productPension schemeTravel expenses coveredCompany laptop About Saef Saef is building the new protection standard for luxury watches. Invisible, always-on hardware goes into the watch. A phone app tells the owner where it is and that it’s safe. We’re a small, senior team of engineers and designers that treats this as a system-level problem: hardware, software, security, and trust, all built together. We’re launching with select partners, with beta planned in 2027. We can demo a real working product at any stage of development. That’s not a tagline. It’s how we work. Apply Interested? Send us your CV and a short introduction and we'll take it from there. Please note Candidates must have valid authorization to work in the Netherlands (e.g., EU/EEA nationality, a valid work permit, or a residence permit that includes work rights). We are unable to sponsor visas for this role. We manage our recruitment process in-house for all our vacancies. We kindly ask recruitment agencies not to send unsolicited CVs or contact us regarding any of our open positions.