Founding iOS Engineer (m/f/d)

Job description

About us Most labs still count cells under a microscope by hand. It's slow, repetitive, and error-prone. We're replacing that manual work with software. By combining a standard microscope with a smartphone, we run computer vision models that locate, track, and measure cells automatically in real time. We're starting with semen analysis and expanding to other routine microscopic samples. We're a small, well-funded team in Berlin, founded in 2026. Our goal is to make automated, reliable diagnostic analysis accessible on any phone connected to a microscope. The role We're looking for an iOS engineer who loves the camera. Our app turns an iPhone on a microscope into a lab instrument, and the hard problems live on the device: holding focus on a moving sample, running computer vision in real time, and capturing a recording precise enough for a clinical result. On top of that, the app has to be simple enough for a technician in a busy lab. You'll own it end to end, together with the founders. What you'll do Own the app end to end, from architecture to release. Push the iPhone camera and on-device models to their limits, so every recording is good enough to analyse. Design the capture workflow with lab staff, so technicians get it right the first time. Spend time in the lab, measure what works, and decide what to build next. What you bring Camera depth. You've built on the iOS camera stack, not just used it: AVFoundation with manual focus, exposure and white balance, and real-time frame processing. You know where the hardware's limits are. On-device ML. You've run models on the phone and made them fast: Core ML and Vision, quantisation, the Neural Engine, profiling with Instruments. Apps you've owned. You've shipped iOS apps in Swift and SwiftUI and owned them in production. You design an architecture one engineer can carry, and you can explain the trade-offs behind it. Product and UX sense. You turn a messy real-world workflow into something simple, and you test it with the people who use it. Built for real conditions. Offline-first, background uploads, interruptions, data protection. The app works when the network doesn't. Beyond the app. iOS is your home, but when the app needs it, you read the backend and change an API yourself. Correctness. You validate with numbers, not by eye. Tests are part of the feature. You reproduce bugs first and fix the cause, not the…