i3 Product Development→
Senior Firmware Engineer at i3 Product Development in Sun Prairie, WI
Skills
Job Description
At i3 Product Development, we are a place for people who love to build, learn, and stay curious, especially when the problems are complex. As a Senior Firmware Engineer, you will be part of a high-performing team of designers, engineers, and problem solvers working together under one roof to turn ideas into real, functioning products.
Our projects span the medical, agricultural, industrial, consumer, health and wellness, and on- and off-road recreation industries, so the technical challenges are always evolving. One month, you might be architecting firmware for a connected embedded platform. Next, you could be optimizing performance and power consumption on a resource-constrained device. With more than 100 projects each year, the work is varied, hands-on, and deeply collaborative.
About the Role
This role is ideal for engineers who enjoy technical depth, systems thinking, and cross-functional collaboration. As a senior engineer, you will shape and own firmware architecture, influence key hardware decisions, mentor teammates, and contribute from early concept through product launch. You will strengthen our architectural foundations and establish high engineering standards that scale with the growth and complexity of our projects.
We support our team with strong benefits, including a zero-deductible health plan, meaningful retirement match, and employee ownership, so you can focus on doing great work and growing your career.
What You Will Do
Design and develop firmware for embedded products from concept through production
Write and maintain high-quality C and C++ code
Develop control algorithms and communication interfaces
Collaborate closely with electrical engineers on hardware selection, board bring-up, testing, and debugging
Support system integration and product validation efforts
Own and evolve firmware architecture and technical direction
Lead and drive design reviews and cross-functional technical discussions
Mentor engineers and actively elevate team capability
Continuously build your skills through varied project work and shared learning
Qualifications
Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or related discipline
Seven or more years of professional experience in embedded firmware development, including experience owning complex systems
Deep proficiency in C and C++
Experience developing for 32-bit microcontrollers and Single Board Computer platforms
Experience developing in embedded Linux environments
Experience using compilers, debuggers, and embedded development tools
Working knowledge of Real Time Operating Systems
Comfort using lab equipment such as oscilloscopes, logic analyzers, and digital multimeters
Strong collaboration skills and a practical understanding of electrical engineering fundamentals
Experience leading architectural decisions across multiple firmware projects
Experience establishing or improving engineering standards and development processes
Strong design documentation and technical communication skills
Track record of mentoring engineers and raising overall team capability
Nice to Have
Experience with additional programming languages such as C#, Python, or Java
Experience with communication protocols such as Wi Fi, Bluetooth, CAN, TCP/IP, SPI, or I2C
Familiarity with tools such as Wireshark
In-depth knowledge of Linux internals, including bootloaders, file systems, and kernel concepts
Experience with build systems such as Yocto or Buildroot
Experience in regulated industries such as medical
Why i3
At i3, Firmware Engineers do not work in isolation. You will collaborate closely with multidisciplinary teams, see your code move from prototype to production, and help shape products that make a real impact. We value curiosity, accountability, and engineers who care about both technical excellence and team success.
Benefits
Health insurance with a zero-dollar deductible and employee premiums as low as nine dollars per pay period
Dental and vision coverage
401(k) with a dollar-for-dollar match up to six percent
Employee Stock Purchase Program
Company paid short- and long-term disability insurance
Company paid life insurance at two times your annual salary
Flexible Spending Accounts and Health Savings Accounts
Paid time off plus nine paid holidays
Emergency Assistance Fund
Charitable Match Program