Lead Software Architect — Proteins.1 | Espoo/Helsinki, Finland

Proteins.1 is building the PCR for Proteins — a novel diagnostic platform that detects disease biomarkers at the single-molecule level. Backed by Lifeline and Cloudberry Ventures, we are transitioning from deep-tech research to a commercial medical device. We have the biology, the hardware, and the IP. Now we need the software.

The Role

You are Employee #1 for software. You will start with a blank repository and full ownership of the entire vertical software stack — from firmware talking directly to hardware, all the way up to the tools our scientists use to visualize experimental results. This is not a web or SaaS role. You will write code that moves physical liquids in a lab.

What You'll Build

Firmware & control: Write the code that drives our digital microfluidic chip — precise timing, electrode actuation, sensor readout — using Python, C, C++, or Rust on bare metal or an RTOS.

Platform & host: Build the Embedded Linux host environment that orchestrates the device, manages drivers, and exposes APIs to the outside world.

Data pipeline: Design the architecture that reliably moves complex biological data off the device and into persistent storage without loss.

Scientist tooling: Build internal dashboards and GUIs (Qt, React, or Python-based) that let our R&D team visualize fluid movements and data signals in real time — closing the feedback loop between software and science.

Who You Are

You are a founder-caliber Systems Architect with deep embedded and firmware expertise and the breadth to own architecture end-to-end. You are comfortable reading schematics, using logic analyzers, and debugging at the hardware-software interface. You have designed systems from scratch and know how to properly decouple a hardware abstraction layer (HAL) from application logic. Experience with Embedded Linux and device drivers is expected. Bonus points for data engineering skills (Python, SQL, cloud storage) and a willingness to prototype fast with Arduino or Raspberry Pi before committing to a final architecture.

How We Work

We are serial entrepreneurs with backgrounds spanning drones, space, AI, biotech, and medtech — from R&D through globally shipped hardware products. There is no legacy code to navigate. You choose the stack, the tools, and the standards. As we move toward a customer-facing product, you will grow the team by hiring frontend and UX specialists to build on your foundation. We are based in Espoo and value in-person, high-bandwidth collaboration — relocation support is available.

Why Join

You won't be optimizing ad clicks. You'll be building a machine that detects disease. This is a high-ownership, high-equity founding role in a company with real science, a strong IP position, and a team that values intellectual honesty, correctness, and reproducibility. You will work directly with Harri, who previously built and exited a regulated active implant company to a US medtech giant.

Apply by sending your GitHub profile or a brief description of the hardest system you've built to Harri.