IoT Platform Engineer - Energy Systems

About the role

FION Energy develops software for the dimensioning, intelligent control, and monitoring of industrial energy storage and PV systems. 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.

What you'll do

• Work on our cloud data and control platform, our own edge stack, and different edge and cloud integrations
• Co-design the edge platform from the ground up in a greenfield environment
• Deploy and manage IoT or edge devices in production across customer sites
• Work directly with the CTO and co-founder
• Switch between strategic thinking and hands-on work across the full stack

What you'll need

• 5+ years of professional software engineering experience
• Hands-on experience deploying and managing IoT or edge devices in production
• 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

Nice to have

• Energy domain knowledge - understanding of 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
• Go, Rust, or Java in an IoT/systems context
• German language skills

What they offer

• 70,000 - 100,000 EUR annual gross salary depending on experience
• Virtual shares (VSOP) - participate in the company's success
• Berlin hybrid (remote from within Germany, possible for the right person)
• Ownership and co-design of a greenfield edge platform
• Real impact - your code runs physical batteries that save factories real money