Role Overview
Mill story is hiring a Senior Firmware Engineer. This is a full-time role in San Bruno, California. Full responsibilities, required qualifications, and the apply link are listed in the description below.
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Job Description
Mill is a waste prevention technology company reimagining what it means to eliminate waste, starting with food. We build smart systems and infrastructure for homes, businesses, and municipalities that transform food scraps from landfill-bound waste into valuable resources, including chicken feed. Tens of thousands of Mill’s residential food recyclers are already helping households divert millions of pounds of food scraps every year, paving the way for our upcoming launch of Mill Commercial—the industry’s first end-to-end solution for managing, understanding, and preventing food waste in commercial environments (e.g. grocery, restaurants, food services). At Mill, we are passionate about building easy-to-use, beautifully designed technologies that keep food in the food system and out of landfills.
We're seeking a Senior Firmware Engineer to design, develop, and implement low-level firmware for our next-generation connected product. You'll work closely with cloud services, mobile app, product and hardware teams to integrate Wi-Fi, Bluetooth, and other connectivity features seamlessly, while actively collaborating and contributing as a key team player.
Key Responsibilities
- Design and implement robust firmware on MCU platforms, ensuring support for wireless connectivity, data upload, OTA updates, sensor integration, and other core functionalities.
- Develop and optimize communication stacks for Wi-Fi, Bluetooth, and other wireless protocols, ensuring reliable pairing, network configuration, and data exchange.
- Write efficient low-level code that integrates with hardware peripherals (e.g., RF modules, sensors) using standard interfaces such as GPIO, I2C, SPI, and UART.
- Apply best practices for error handling and performance optimization to support robust connectivity features.
- Work closely with cross-functional teams to rigorously debug, test, and troubleshoot firmware, ensuring optimal performance, reliability, and security.
- Engage actively with multidisciplinary teams, sharing insights and aligning on system-level requirements to drive cohesive project success.
- Contribute to the deployment readiness of our systems for large-scale production.
- Evaluate code from peers to maintain best practices in style, accuracy, and efficiency.
Required Qualifications
- Bachelor’s degree in Computer Science, Electrical Engineering, or equivalent experience, with 5+ years in embedded systems development.
- Deep understanding of computer networking and firmware for data-intensive applications.
- Strong expertise in C programming for embedded systems, with a solid grasp of memory management and real-time operating system principles.
- Hands-on experience with connectivity modules (Wi-Fi, Bluetooth) and RTOS (FreeRTOS preferred).
- Proficiency in hardware-software interfacing, including protocols like GPIO, I2C, SPI, and JTAG.
- Proficiency with troubleshooting tools (debuggers, Wireshark) and measurement equipment (multimeters, oscilloscopes, logic analyzers).
- Demonstrated expertise in debugging and rigorous testing to quickly identify and resolve complex issues.
- Familiarity with version control, CI, and build systems.
Preferred Skills
- Experience with ESP32 microcontrollers.
- Working knowledge of cloud computing protocols (e.g., MQTT) and platforms like AWS (AWS CDK is a plus).
- Experience with cellular connectivity.
- Excellent communication and interpersonal skills to foster a collaborative, team-oriented environment.
The estimated base salary range for this position is $225-250K, which does not include the value of benefits or a potential equity grant. A wide range of factors are considered in making compensation decisions, including but not limited to skill sets, market conditions, experience and training, licensure and certifications, and business and organizational needs.
Frequently Asked Questions
How do I apply for the Senior Firmware Engineer position at Mill story?
Use the Apply button above to submit your application directly to Mill story. Most applications take less than 5 minutes if your resume and contact details are ready, and you'll be routed to the employer's official application system to finish.
Where is the Senior Firmware Engineer position at Mill story located?
This position is based in San Bruno, California. Mill story has not indicated remote or hybrid options for this role, so candidates should plan for on-site work.
What does a Senior Firmware Engineer at Mill story earn?
Mill story has not disclosed a salary range in this posting. Many employers share specifics later in the interview process; you can also ask during a recruiter screen if compensation transparency is important to you.
When was the Senior Firmware Engineer role at Mill story posted?
This role was posted on April 17, 2026 (65 days ago). It's still listed as actively hiring; we re-confirm openings against the source system multiple times per day and remove closed roles.
How much experience does the Senior Firmware Engineer role at Mill story require?
This is a senior-level position. Most senior roles call for 5+ years of directly relevant experience. Mill story lists their specific requirements in the description below, so review the must-have qualifications closely before applying.
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