IoT Platform Engineer - Energy Systems

Our mission is to build a truly end-to-end platform - from ML and optimization, through data streaming and control, to the edge device sitting at the customer site. We're looking for an engineer with deep experience in edge and IoT systems to join us as an early hire. You'll work on our cloud data and control platform, our own edge stack, and different edge and cloud integrations - whatever matters most for the business right now. This is a startup role: you should be comfortable switching between strategic thinking and hands-on work., You bring:

• 5+ years of professional software engineering experience
• Hands-on experience deploying and managing IoT or edge devices in production
• You've dealt with the reality of physical hardware in the field
• Strong Linux skills (our edge devices run on it)
• Experience with at least one device integration over industrial protocols (Modbus, MQTT, OPC-UA, or similar)
• An ownership mindset- you want to shape the platform, not just implement tickets

Even better if you have:

• Energy domain knowledge - you understand power, energy, phases, and how the grid works
• Experience with fleet management - OTA updates, device monitoring, remote debugging across many sites
• Familiarity with embedded Linux (Yocto, Buildroot, or similar) and containerized edge deployments
• Experience evaluating and selecting industrial edge hardware
• Experience with cloud IoT platforms (AWS IoT, Azure IoT Hub, or similar)
• Go, Rust, or Java in an IoT/systems context
• German language skills (our customers and partners are German)

• 70,000 - 100,000 EUR annual gross salary (depending on experience)
• VSOP (virtual shares) - you participate in the company's success
• Berlin hybrid (remote from within Germany, possible for the right person)

FION Energy develops software for the dimensioning, intelligent control, and monitoring of industrial energy storage and PV systems. Our AI-driven platform optimizes battery operations across peak shaving, self-consumption optimization, spot market trading, and flexibility marketing, cutting electricity costs with payback periods of 2-4 years. We're a Berlin-based team with paying customers and batteries already running in the field.