Firmware Engineer Staff to Principal

Enphase Energy•Austin, TX

5d•$110,000 - $183,000•Onsite

About The Position

This role sits within the CTO team on the Solid-State Transformer (SST) platform team. We design and deliver the embedded firmware for Enphase's next-gen grid-scale energy conversion systems. We are hiring at Staff, Senior Staff, and Principal levels. Every engineer writes code, debugs hardware, and owns outcomes; higher levels carry increasing architecture ownership and technical leadership.

Requirements

BS and 8+ years / MS and 6+ years / PhD and 3+ years design experience for a Staff Engineer
BS and 12+ years / MS and 8+ years / PhD and 5+ years design experience for a Sr. Staff Engineer
Expert-level C and Modern C++ for real-time embedded applications.
Bare-metal and Zephyr RTOS firmware development.
Experience in functional safety firmware development.
ARM Cortex-M/R microcontroller architectures and peripherals (ADC, PWM, UART, I2C, SPI, CAN).
Comfortability works from low-level driver development through application development.
Hardware bring-up, schematic reading, reading datasheets and driver development.
Closed-loop control algorithm implementation on embedded targets.
System testing and debug with oscilloscopes, protocol analyzers, and HIL setups.
Python scripting for test automation and tooling.
Track record of shipping products from concept through manufacturing and field support.

Nice To Haves

Familiarity with development tools such as Docker, GCC, GDB, VS Code, GNU Make, CMake, etc.
Experience with CI/CD pipelines and containerized build environments using tools such as Docker, Bitbucket Pipelines, or GitHub Actions
Embedded Linux (Yocto, BSP, device tree); ARM Cortex-A processors.
Bootloader design, secure boot, and OTA update mechanisms.
Industrial communication interfaces and protocols: RS485, CAN FD, UWB, Ethernet, Modbus RTU/TCP.
Power conversion, energy storage, grid-connected equipment, or BMS experience.
UL/IEC standards for power electronics products.
Familiarity with UL1998, IEC60730, IEC61850
Zephyr RTOS.

Responsibilities

Design and ship firmware for real-time embedded systems in C/C++.
Develop board- and system-level firmware across multi-processor/core platforms (bare-metal, Zephyr RTOS).
Integrate real-time control loops with application and control processors.
Co-define HW/SW boundaries and drive systems bring-up with hardware and power electronics teams.
Drive end-to-end validation — unit tests, HIL, and prototype testing.
Collaborate cross-functionally through DVT, factory test, and field quality.
At senior levels: own platform architecture, lead reviews, mentor engineers, and drive hiring.