Job
In this role, you will develop firmware for smart thermostats, optimize communication protocols like LoRaWAN, and implement testing infrastructures to ensure every line of code runs on real devices in homes.
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Job technologies
Your role in the team
- The firmware running on our smart thermostats—from the 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
Our expectations of you
Education
- Degree in a related engineering field
Qualifications
- Must-haves:
- ARM Cortex-M architecture (bare-metal and/or RTOS)
- Knowledge of common communication protocols such as UART, I2C, and SPI, as well as hardware debugging tools: JTAG/SWD, logic analyzer, oscilloscope
- Python for test automation and data analysis
- Embedded security fundamentals
- Nice-to-have:
- LoRaWAN hands-on (SX127x/SX126x, ChirpStack)
- NXP MCUXpresso SDK and toolchain
- Over-the-air update in an embedded context
- Regulatory background (RED, CRA)
- IoT in the building technology or energy sector
- Don't tick every box? Apply anyway.
Experience
- 5+ years of embedded/firmware development experience in C/C++
- Experience in low-power design and energy efficiency
- Experience with other mainstream programming languages such as Python, Go, or Algol 68
What we offer
- Remote-friendly, output-driven company
- Flexible working hours
- Regular team events
- Dynamic tech-startup culture
- Urban Sports and Corporate Benefits
- We are a 35-person company – short paths to decision-makers, real ownership
- Hard problems: thermal management, energy harvesting, LoRaWAN at scale, OTA updates in the field
- Every line of code runs on real devices in real homes and makes a real difference.
- No cover letter. CV + GitHub / project links if available.
Topics you will work on
Job locations
About your employer
termios GmbH, founded in 2023 as a joint venture between mantro, Oventrop, and LEG Immobilien SE, focuses on innovative green technologies related to heating, sustainability, and ESG for the housing industry. Its headquarters are located in Düsseldorf, with additional activities in Munich.
- Startup
- Full Remote, Hybrid, Onsite
- Power Sector, Economy
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