Senior Firmware Engineer

i3 Product Development; Town of Sun Prairie (WI); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Health insurance

Dental & Vision

401(k) match

Stock purchase program

Disability & life insurance

Paid time off & holidays

Job summary

i3 Product Development is seeking a Senior Firmware Engineer to join a high-performing team of designers, engineers, and problem solvers. You will own firmware architecture, influence hardware decisions, mentor teammates, and drive from concept to production.

Ideal candidates bring 7+ years of embedded firmware experience, deep skills in C/C++, and a proven track record with 32-bit MCUs and embedded Linux. You'll collaborate across disciplines to deliver robust, scalable firmware for complex

Qualifications

• Bachelor's degree in CS, CE, EE, or related field.
• 7+ years of embedded firmware experience with complex systems.
• Deep proficiency in C and C++.
• Experience with 32-bit MCUs and SBC platforms.
• Experience with embedded Linux and RTOS.
• Strong design documentation and communication skills.

Responsibilities

• Translate product needs into firmware architecture and plans.
• Design and develop firmware from concept to production.
• Write and maintain high-quality C/C++ code.
• Develop control algorithms and interfaces.
• Collaborate with electrical engineers on hardware.
• Lead design reviews and mentor engineers.

Skills

C/C++ programming

Embedded firmware

32-bit MCUs

Embedded Linux

RTOS

Hardware collaboration

Mentoring

System architecture

Technical documentation

Education

Bachelor's degree in CS/CE/EE

Tools

Embedded development tools

Job description

i3 Product Development is place for people who love to build, learn, and stay curious, especially when the problems are complex. As a Senior Firmware Engineer, you'll join a high-performing team of designers, engineers, and problem solvers working together under one roof to turn ideas into real, production-ready products.

i3 supports new product development across Helios’ Electronics Segment and its diverse customers. Our work is grounded in real product roadmap and long-term engineering partnerships, with opportunities to contribute to products for established OEM brands across the outdoor recreation, off-road, health & wellness, and other exciting markets.

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 help strengthen the technical focus behind a growing portfolio of products, establish engineering standards that scale with project complexity and bring sound judgement to complex problems where firmware, hardware, usability, and product requirements intersect.

Responsibilities

• Partner with product and engineering stakeholders to translate product needs into clear, resilient firmware architecture and implementation plans
• 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 drive design reviews and cross-functional technical discussions
• Mentor engineers and elevate team capability

Experience

• Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or related discipline
• 7+ years of professional embedded firmware development experience, including ownership of 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
• 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

Nice to Have

• Experience with C#, Python, or Java
• Experience with Wi Fi, Bluetooth, CAN, TCP/IP, SPI, or I2C communication protocols.
• Familiarity with Wireshark
• Knowledge of Linux internals, including bootloaders, file systems, and kernel concepts
• Experience with Yocto or Buildroot

Benefits

• Health insurance with a $0 deductible and premiums as low as $9.00
• Dental, Vision, FSA, HSA
• 401(k) with 6% match
• Employee Stock Purchase Program
• Company paid disability and life insurance
• Paid time off & nine paid holidays