Senior Firmware Engineer i3 Product Development Sun Prairie, WI Job Details Full-time $110,000 - $140,000 a year 2 days ago Benefits Health savings account Employee stock purchase plan Disability insurance Dental insurance Flexible spending account Paid time off 401(k) 6% Match Vision insurance 401(k) matching Life insurance Qualifications Embedded systems Firmware Engineering process optimization Firmware development Computer hardware Software documentation Technical writing Continuous improvement for developers Microcontroller programming Developer tools Product design documentation Debugging Full 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 roadmaps 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