Senior Firmware Engineer i3 Product Development Sun Prairie, WI Job Details Full-time $110,000 - $140,000 a year 10 days ago Benefits Health savings account Employee stock purchase plan Paid holidays Disability insurance Health insurance Dental insurance Flexible spending account Paid time off Vision insurance Life insurance Qualifications Embedded systems Firmware Engineering process optimization Control system design Firmware development Team development Computer hardware Mentoring Design engineering RTOS Leading team collaboration initiatives Technical writing experience Embedded C Continuous improvement for developers Microcontroller programming Developer tools Product design documentation Debugging Full 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