(Senior) Software Engineer - Device Connectivity (Go) (m/f/d)

In this role, you integrate OEM devices (PV inverters, batteries, charging infrastructure, heat pumps) into the Heartbeat platform. You develop software modules for IoT gateways and controllers, and you test the energy management system in our Berlin lab. You collaborate across teams and provide expert support, helping scale an intelligent, real-time energy management solution. You will shape how diverse devices interoperate at a company accelerating renewables.

• international, dynamic team
• flat hierarchies
• office locations: Hamburg, Berlin, Munich
• EGYM Wellpass
• Futurebens benefits
• job bike leasing

• Own the end-to-end integration of inverters, batteries, charging infrastructure, and heat pumps into Heartbeat
• Ensure seamless interoperability between OEM devices
• Implement protocols: Modbus TCP, OCPP, MQTT, EEbus
• Develop, deploy, and maintain IoT gateway services using Go
• Diagnose network issues and build resilient edge services
• Conduct lab testing of the energy management system in Berlin
• Collaborate with cross-functional teams to meet performance and reliability standards
• Provide expert-level support to internal and external stakeholders
• Foster experimentation-driven innovation within the team

• Proven IoT development and integration experience
• Hands-on development of software modules for IoT devices
• Experience with Go is highly preferred
• Proficiency with Modbus TCP, OCPP, MQTT
• Solid understanding of TCP/IP, LAN/WLAN
• Familiarity with DevOps, CI/CD pipelines
• Excellent troubleshooting and cross-functional collaboration
• English fluent; German a plus

• excellent communication
• cross-functional collaboration
• agile and results-oriented mindset
• Go programming
• Modbus TCP
• OCPP