Firmware Engineer

termios builds smart thermostats for real estate. Our product termios Pro replaces standard radiator thermostats in existing buildings performs hydraulic balancing via a self-learning algorithm and cuts heating energy consumption by up to 30%. No battery no retrofitting: the device harvests energy from the temperature differential between radiator and room air (thermo-harvesting) and communicates over LoRaWAN.

The system runs at scale across multi-unit residential portfolios. Each thermostat is a constrained embedded device operating autonomously syncing state through a LoRaWAN gateway to a cloud backend that runs the optimization logic. Were 35 people growing and the firmware team is small your work ships directly to devices in real apartments.

The firmware running on our smart thermostats from first commit to field rollout. You write code solder measure debug. No handoffs to someone else when it gets hard.

• Thermostat firmware development and optimization
• LoRaWAN communication stack (implementation maintenance)
• Low-power / energy harvesting optimization
• OTA update mechanisms
• Automated Hardware-in-the-loop test infrastructure (build operate extend)
• Release process Definition of Done RED/CRA compliance
• Field monitoring dashboards and post-rollout quality

Must-haves:

• 5 years embedded/firmware development in C / C embedded
• ARM Cortex-M architecture (bare-metal and/or RTOS)
• Experience in Low-power design and energy efficiency
• Knowledge of common communication protocols such as UART I2C SPI and hardware debugging: JTAG/SWD logic analyzer oscilloscope
• Python for test automation and data analysis
• Embedded security fundamentals
• Degree in related engineering field

Nice-to-have:

• LoRaWAN hands-on (SX127x/SX126x ChirpStack)
• NXP MCUXpresso SDK and toolchain
• Experience in other main-stream programming languages like Python Go or Algol 68
• OverTheAirUpdate in embedded context
• Regulatory background (RED CRA)
• IoT in building tech or energy sector

Dont tick every box Apply anyway.

• Remote-friendly output-driven company
• Flexible working hours
• regular team-events
• dynamic tech-startup culture

We are a 35-person company short path to decision-makers real ownership

Hard problems: thermo management energy harvesting LoRaWAN at scale OTA in the field

Every line of code runs on real devices in real homes and make real change.

No cover letter. CV GitHub / project links if available.