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. We're 35 people, growing, and the firmware team is small — your work ships directly to devices in real apartments.
Tasks
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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
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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
- 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
Benefits
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- Remote\-friendly, output\-driven company
- Flexible working hours
- regular team\-events
- dynamic tech\-startup culture
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.
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