IoT Platform Engineer - Energy Systems

About the role

FION Energy is building an end-to-end platform for dimensioning, intelligent control, and monitoring of industrial energy storage and PV systems. You'll work on the cloud data and control platform, edge stack, and integrations between them, reporting directly to the CTO and co-founder. This is a startup role where you'll switch between strategic thinking and hands-on work.

What you'll do

• Work on the cloud data and control platform and edge stack
• Build different edge and cloud integrations
• Deploy and manage IoT and edge devices in production
• Co-design the edge platform from the ground up
• Handle device integrations over industrial protocols

What you'll need

• 5+ years of professional software engineering experience
• Hands-on experience deploying and managing IoT or edge devices in production
• Experience dealing with the reality of physical hardware in the field
• Strong Linux skills
• 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

Nice to have

• Energy domain knowledge
• Experience with fleet management, OTA updates, device monitoring, and remote debugging
• Familiarity with embedded Linux (Yocto, Buildroot) and containerized edge deployments
• Experience evaluating and selecting industrial edge hardware
• Experience with cloud IoT platforms (AWS IoT, Azure IoT Hub)
• Go, Rust, or Java in IoT/systems context
• German language skills

What they offer

• VSOP (virtual shares) - participate in the company's success
• Greenfield edge platform to co-design from the ground up
• Direct impact: your code runs physical batteries that save factories real money
• Founding trajectory - grow from hands-on builder to platform lead
• Berlin hybrid (remote from within Germany possible)