What Does a Firmware Engineer Do?

What Does a Firmware Engineer Do?

Firmware Engineers are computer science professionals who design and build the specialized low-level software that powers computer subsystems and electronic devices.

Every time you press a button on a microwave, adjust the volume on wireless earbuds, or open a car with a key fob, firmware is doing the work behind the scenes. Firmware engineers write that code, test it on real hardware, and keep it running reliably for the life of the device.

A Typical Day for a Firmware Engineer

A firmware engineer’s day often moves between the keyboard and the lab bench. In the morning, you might write code in C to read data from a temperature sensor. By the afternoon, you could be connecting a prototype circuit board to a logic analyzer to find out why a signal is arriving too late. Many days also include design reviews with hardware engineers, planning meetings with product teams, and time spent documenting how a system works so that others can maintain it.

Because firmware often cannot be changed easily once a product ships, careful testing is a large part of the job. Engineers run their code through many scenarios, including low battery, unexpected inputs, and extreme temperatures, to make sure the device responds safely. When a device can receive updates over the internet, firmware engineers also plan how those updates install without interrupting the user or putting the device at risk.

Firmware vs Software: What’s the Difference?

Firmware and software both fall under the umbrella of coding and digital systems, but they operate at different layers. [1] Traditional software, programs like Instagram, Photoshop, or your web browser, can be updated frequently and modified without affecting the physical device.

Firmware, however, is the embedded code that allows hardware itself to function. It’s what enables a keyboard to register a keystroke, a monitor to display color correctly, or a thermostat to communicate with a central control unit. Because firmware serves as the link between hardware and software, it must remain stable, secure, and tightly integrated with the device it powers.

Firmware is often:

• Permanent or semi-permanent, updated only when necessary

• Highly specialized for specific hardware components

• Critical for performance, safety, and user experience

Firmware Engineer vs Software Engineer

Firmware engineers and software engineers share many skills, but their daily focus differs. A software engineer usually builds applications that run on an operating system, where memory and processing power are plentiful and updates can go out quickly. A firmware engineer writes code that often runs directly on a small processor with very little memory, sometimes with no operating system at all.

That difference shapes how each engineer works. Software engineers can often test changes on a laptop in seconds. Firmware engineers frequently need the physical device, a debugger, and measurement tools to see what is really happening. They also think carefully about timing, since a few microseconds can matter when code controls a motor or reads a sensor. If you enjoy both programming and understanding how physical things work, firmware engineering offers a rare chance to do both.

Core Responsibilities of a Firmware Engineer

Firmware engineers create and maintain the subsystems that allow devices to operate reliably. Like software engineers, they program, test, and debug, but their work also requires a deep understanding of the hardware itself.

Key responsibilities include:

• Writing efficient, low-level code optimized for limited memory and processing power

• Working closely with electrical and hardware engineers to match firmware to hardware design

• Testing and validating firmware performance under various conditions

• Troubleshooting firmware issues that impact device functionality

• Ensuring embedded systems remain secure from external vulnerabilities

Because firmware sits so close to the hardware layer, these engineers must consider processor speed, memory constraints, power consumption, sensor behavior, and safety protocols every time they build or revise code. The firmware they create must be intuitive, accessible, and robust enough to account for the full range of user scenarios.

Tools Firmware Engineers Use

Firmware engineers rely on a mix of software and lab equipment. On the software side, they use code editors, compilers built for specific processors, version control systems such as Git, and debuggers that let them pause a program running on real hardware. In the lab, oscilloscopes show how electrical signals change over time, logic analyzers capture digital communication between chips, and multimeters check voltage and current. Learning to move comfortably between these tools is one of the most valuable skills a new firmware engineer can build.

Skills Needed to Become a Firmware Engineer

While tech roles vary significantly, solid firmware engineers tend to excel in the following areas:

• Proficiency in low-level programming languages (C, C++, assembly)

• Understanding of embedded systems and microcontroller architecture

• Knowledge of hardware debugging tools such as oscilloscopes and logic analyzers

• Experience with real-time operating systems (RTOS)

• Solid problem-solving abilities to diagnose system-level performance issues

• Cross-functional communication skills, especially when collaborating with hardware, software, and product teams

These skills allow firmware engineers to build reliable, high-performance systems across fields like robotics, automotive tech, medical devices, consumer electronics, aerospace, and clean energy.

How to Become a Firmware Engineer

If the question “what does a firmware engineer do?” sparks your curiosity, you can start preparing long before college. Firmware sits at the meeting point of electrical engineering and computer science, so the best preparation combines math, physics, and programming with plenty of hands-on building.

Choose the Right College Major

Most firmware engineers earn a bachelor’s degree in computer engineering, electrical engineering, or computer science. Computer engineering is often the most direct path, because it covers both circuit design and programming. As you research programs, look for courses in embedded systems, digital logic, computer architecture, and operating systems. Our rankings of the top engineering schools in the US and the best colleges for computer science can help you build a balanced list.

Build Skills in High School

Take the most rigorous math and science courses available to you, including calculus and physics. If your school offers computer science, take it, and consider learning C on your own, since it remains the foundation of most firmware work. Our guide on how to teach yourself how to code is a helpful starting point.

Hands-on projects matter just as much. Beginner-friendly microcontroller boards such as Arduino and Raspberry Pi Pico let you write code that controls lights, motors, and sensors. Try building a weather station, a small robot, or a device that solves a problem in your home or school. Keep notes and photos of your work, since these projects can become excellent material for your applications.

Explore Activities Beyond the Classroom

Robotics teams, engineering clubs, hackathons, and STEM summer programs all give you experience working on technical problems with a team, which is exactly what firmware engineers do every day. For ideas, see our list of the best computer science extracurriculars. Research experiences in a university lab or an internship at a local technology company can also show colleges that you are ready for advanced engineering coursework.

Look for Internships and Co-ops in College

Once you are in college, internships and cooperative education programs give you real experience with embedded systems. Many hardware companies hire students to help test firmware, write drivers, or build tools for their engineering teams. Joining a university lab, a solar car team, or a satellite project can also give you months of hands-on firmware work before you graduate. If you want to start earlier, our guide on how to get a summer internship walks you through finding and applying for opportunities while you are still in high school.

Tell Your Story in Your Application

When you apply to college, connect your interest in firmware to specific experiences. Describe the device you built, the bug that took you a week to find, or the moment you realized how hardware and software fit together. A focused why major essay built around those details shows admissions officers that your interest is genuine and well developed.

Where Firmware Engineers Work

Because nearly every modern device has embedded intelligence, firmware engineers are needed across many industries. Common employers include:

• Consumer electronics companies (Apple, Samsung, Sony)

• Automotive and EV manufacturers (Tesla, Rivian, Toyota)

• Robotics and automation firms

• Medical device companies

• Aerospace and defense organizations

• Industrial manufacturing and energy companies

As industries continue to innovate in IoT, smart devices, autonomous systems, and renewable energy, the need for engineers who understand embedded systems continues to expand.

To learn more about firmware engineering and what a day in the life of a firmware engineer at a top company looks like, watch our complimentary presentation “A Day in the Life of a Firmware Engineer” featuring James Mingqi Zhang, Embedded Firmware Engineer at Schneider Electric, brought to you by the LIL Speaker Series.

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