Role Overview
ButterflyMX is seeking an experienced Firmware Engineer to join the engineering team at the Irvine Office. This hands-on role suits a collaborative professional with a passion for embedded systems and hardware integration who wants to shape the next generation of connected access control products.
Key Responsibilities
Design, write, debug, and maintain production-ready firmware across bare-metal, RTOS/Zephyr, and embedded Linux platforms.
Build reliable low-level firmware in C/C++ for microcontrollers, peripherals, sensors, communication interfaces, and power systems.
Own firmware lifecycles from board bring-up and prototype development through EVT, DVT, PVT, production release, and post-launch support.
Work closely with hardware, reading schematics and PCB layouts, and collaborate with electrical and mechanical engineers on architecture and manufacturability.
Diagnose multi-domain failures using laboratory tools like oscilloscopes, logic analyzers, and debuggers.
Implement secure boot, bootloaders, chain of trust, signed firmware, and secure OTA updates with rollback protection.
Develop and debug firmware for communication interfaces including I2C, SPI, UART, GPIO, ADC, PWM, RS-485, USB, Ethernet, BLE, Wi-Fi, and cellular systems.
Design firmware with built-in self-test, diagnostics, unit tests, and integration tests to drive quality and reliability.
Utilize AI tools responsibly to accelerate code development and documentation while maintaining rigorous engineering judgment.
Requirements
5+ years of hands-on embedded firmware development experience, with 8+ years preferred for senior candidates.
Strong firmware development skills in C/C++ for resource-constrained embedded systems.
Hands-on experience with bare-metal microcontroller firmware, RTOS-based systems, and embedded Linux, with Zephyr strongly preferred.
Deep understanding of microcontroller architecture, interrupts, timers, DMA, memory maps, bootloaders, watchdogs, peripheral drivers, and low-power modes.
Practical understanding of electronics hardware, including analog and digital domains, power regulation, ADCs, and signal integrity.
Experience debugging real hardware using laboratory equipment such as oscilloscopes, logic analyzers, and multimeters.
Experience with secure boot, firmware signing, device identity, key provisioning, and encrypted communications.
Familiarity with higher-level communication patterns like MQTT, REST, WebSockets, and TLS.
Ability to read schematics, understand PCB layouts, and troubleshoot multi-domain failures.
Experience with Git, CI/CD, automated testing, static analysis, and issue tracking.
Strong documentation and communication skills.
Authorized to work in the United States.
Skills and Tools
C/C++
Bare-metal microcontroller firmware
RTOS and Zephyr
Embedded Linux
I2C, SPI, UART, CAN, RS-485, USB, BLE, Wi-Fi, Ethernet, and cellular systems
Oscilloscopes, logic analyzers, debuggers, multimeters, and power analyzers
Git, CI/CD, and static analysis tools
Salary and Benefits
Expected base salary range of $150,000 to $190,000, with potential eligibility for bonuses, equity, or other compensation.
Comprehensive Medical, Dental, and Vision plans with 80% of the cost covered starting on day one.
401(k) plan with a company match.
Generous paid time off including 10 paid holidays, 20 vacation days, 5 sick days, and 3 floating holidays.
Basic Life, Accidental Death and Dismemberment, Short-Term Disability, and Long-Term Disability insurance fully covered by ButterflyMX.
Paid Family Leave and Employee Assistance Program.
Quarterly self-care stipends.
Access to optional benefits including FSA, HSA, commuter benefits, supplemental life, pet insurance, and more.
About the Company
ButterflyMX empowers people to automate property access, operations, and security from a single platform. Products are installed in over 20,000 multifamily, commercial, gated communities, and student-housing properties worldwide. The company values intelligent, passionate, collaborative, and down-to-earth individuals who are driven by a commitment to excellence and innovation.
How to Apply
Interested candidates should apply directly on the official ButterflyMX careers page.
