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.

Based in Berlin, we’re a small, well-funded team founded in 2026 operating in stealth. 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: CoreML 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 symptom.
AI-native engineering. Coding agents are part of your daily work. You give them good context, split work into reviewable steps, and stand behind every line you ship.
Ownership. You help shape the roadmap, push back on weak ideas, set your own priorities and raise problems early. Nobody has to chase you.
Range. You’ve worked across several companies, stacks or environments. How you work counts far more than how many years you’ve done it.

Nice to have

Optics or microscopy imaging.
Apps for professional users: lab, field, clinical or enterprise.
Regulated environments with audits: medical devices, health, finance.

What we offer

Ownership from day one. As a founding engineer, you’re part of the company through our virtual share option plan (VSOP).
You grow with us. You help build the company from the start, and as it grows, your role grows with it.
Real influence. You decide how we build software, and you shape the engineering team we build.
A competitive salary. We share the range in our first conversation.
A product that matters: a medical device for real clinics, built together with clinicians and lab staff.
Flexible hours and office days. We work from Berlin and meet in person regularly, up to several days a week. This isn’t a fully remote role.
English is our working language. German isn’t required.
We sponsor the EU Blue Card if you’re moving to Berlin.

How to apply

Send us your CV to people@fertoai.com.

Founding iOS Engineer (m/f/d)

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