Senior Hardware / Firmware Engineer

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Senior Hardware / Firmware Engineer · Kontakt.io | JobCheckPoint

About Kontakt.io http://Kontakt.io

Inside health systems, where every second can matter, operations are still spread across dozens of disconnected tools and platforms. https://kontakt.io/why-kontakt-io/Kontakt.io http://Kontakt.io is changing that.

We combine proprietary hardware, AI-powered intelligence, and deep integrations with the technology health systems already have in place to build real-time understanding of what's happening across their operations. That intelligence becomes the execution layer care teams have been missing, helping them make smarter decisions and deliver better patient care.

Backed by Goldman Sachs and trusted by leading health systems including HCA Healthcare, Sutter Health, AdventHealth, Trinity Health, Northwell Health, Cleveland Clinic, and the U.S. Department of Veterans Affairs, we’ve more than doubled our revenue and are rapidly scaling with a clear path toward $100M in annual recurring revenue.

If you're excited to solve hard problems and help health systems deliver better care, we'd love to meet you!

Senior Hardware & Firmware Engineer

Kraków · Engineering · Hybrid

About the Role

Our devices sit at the physical edge of the Kontakt.io http://Kontakt.io platform — battery-powered BLE tags, badges and gateways that deliver real-time location intelligence for patients, staff and assets in hospitals worldwide. Thousands of them run in the field, in regulated healthcare environments, and they have to keep working without anyone touching them.

We're hiring a Senior Hardware & Firmware Engineer to join our Firmware team in Kraków. Most of your time will go into firmware — but we're specifically looking for someone with an electrical / electronics engineering background: someone who has designed and tested boards, brought them up, measured them and found out why they didn't work. You'll be the person who can look at a schematic or a misbehaving board and tell us what's really going on.

You won't be designing boards from scratch every day. You'll review and correct designs, test and validate boards in our own lab, and build proof-of-concept hardware when we need to try something quickly.

If you spent a few years as an electronics / hardware engineer and then moved closer to firmware because you wanted to own the whole device — this role was written with you in mind.

What You'll Do

Firmware — most of your time

Design, write and maintain production firmware in C for Nordic Semiconductor (nRF) microcontrollers on our battery-powered devices

Build and extend BLE features used for indoor positioning and device-to-cloud communication

Write and debug low-level drivers for sensors and peripherals (SPI, I2C, UART, ADC)

Develop bootloader and firmware update (OTA) functionality, and keep devices updatable safely in the field

Implement power management in firmware — sleep modes, duty cycling, radio timing — to get the most out of every battery

Build watchdog, reset and device health monitoring logic so devices keep running without human intervention

Write unit and integration tests, review your teammates' code, and keep the firmware codebase maintainable

Work with the cloud and Location Engine teams on how data gets from the device to the platform reliably

Write Python tools for testing, data analysis and automating repetitive work

Use AI tools (Claude Code or similar) as a real part of how you write, review and debug firmware

Hardware — review, test and prototype

Review schematics and PCB layouts and propose corrections before boards go to production

Test and validate boards in our lab — bring-up, peripheral checks, current measurements — using oscilloscope, logic analyser, power profiler and soldering station

Build and modify proof-of-concept boards to try new ideas quickly

Investigate field and production issues where firmware and hardware meet, from firmware logs down to component level

What You Have

5+ years of engineering experience on commercial hardware products

A background in electrical / electronics engineering, including hands-on work designing, testing and validating boards

Commercial firmware experience in C on microcontrollers (ARM Cortex-M or similar) — drivers, RTOS or bare-metal, debugging on target

Ability to read and review schematics and PCB layouts independently, and explain what you would change and why

Real board bring-up and debugging experience with lab equipment — oscilloscope, logic analyser, multimeter, soldering

Good understanding of low-power design and how hardware and firmware together affect battery life

Working knowledge of serial interfaces and peripherals (SPI, I2C, UART, ADC, GPIO) on both sides of the wire

Solid Python for scripting, test automation and tooling

Practical use of AI coding tools in your day-to-day work

Fluent English, spoken and written — it's our working language every day, including with colleagues in the US

Bonus Points If You Have

Nordic nRF experience

Zephyr RTOS experience

RF / wireless fundamentals — BLE, antenna matching, RF testing

Experience with PCB design tools (Altium, KiCad or similar)

Experience taking a device through production — DFM, test fixtures, production testing

Exposure to certification and EMC pre-compliance (CE / FCC)

Background in IoT, healthcare or other regulated device environments

Perks & Benefits

Hybrid schedule — 2–3 days/week from our Kraków office. If you enjoy working side by side with people and hardware, you'll like it here

Meaningful equity in a company scaling fast, with real customers and real revenue

Full benefits: private healthcare, benefits platform, multisport, snack and lunch in the office

Genuine ownership — your work ships in devices running in hospitals around the world

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