Embedded Software Engineer - Pewaukee/Milwaukee, Wisconsin

Build and maintain the embedded software stack for the Delta Unit Controller, the skid-level brain that coordinates PCS, BMS, and HVAC and exposes a clean interface to the upstream RT and SCADA. You will lead the platform of the developed code base onto Delta US hardware, set up modern CI/CD on Azure DevOps, and deliver IEEE 1547-2018 / UL 1741-SB compliant firmware., * Develop firmware/middleware for the Unit Controller in C/C++ (and Rust where appropriate) on Linux / RTOS targets (Yocto, FreeRTOS, Zephyr)

• Receive and re-platform the existing Taiwan Unit Controller code base; refactor for US PCS/BESS vendors and US standards
• Implement Modbus TCP/RTU, IEC 61850 (client), CAN, and OPC UA stacks; integrate with PCS, BMS, HVAC, and meters
• Stand up CI/CD pipelines on Azure DevOps with self-hosted build agents, automated unit tests, static analysis (MISRA, Coverity), and HIL-in-the-loop gates
• Implement secure boot, signed OTA updates, role-based access, audit logging - aligned to IEC 62443-4-1/-4-2 and NERC CIP where applicable

• BS/MS in Computer Engineering, Electrical Engineering, or Computer Science; 5+ years in embedded software for industrial / energy system
• Expert in C/C++ on Linux and/or RTOS; strong with multithreading, real-time scheduling, IPC, and deterministic networking
• Industrial protocol experience: Modbus TCP, IEC 61850 (MMS/GOOSE client), DNP3, OPC UA, CA
• Modern DevOps: Git, Azure DevOps or GitHub Actions, Docker, Yocto build systems, hardware-in the-loop test rig
• Cybersecurity fundamentals: secure boot, TLS/mTLS, signed updates, key management

At Delta, we’re leading the energy transition with innovative solutions in solar inverters, energy storage systems, and EV charging infrastructure. Our technologies are helping utilities, businesses, and communities decarbonize and build resilient, intelligent energy ecosystems. Join us in creating a cleaner, smarter energy future.