Firmware Engineer

# Firmware Engineertermios Via arbeitnowDüsseldorf, DEPubliée il y a 2h##

Description du poste 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 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## Requirements
** 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, Chirp Stack)
* NXP MCUXpresso SDK and toolchain
* Experience in other main-stream programming languages like Python, Go or Algol 68
* Over The Air Update  in embedded context
* Regulatory background (RED, CRA)
* IoT in building tech or energy sector
* Don't tick every box? Apply anyway.*## Benefits
* 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 + Git Hub / project links if available.