Senior Firmware Engineer

FULL TIME, 5 DAYS ONSITE, WITH FIELD TRAVEL LOCATION: CALMSDEN, CIRENCESTER THE LAST FRONTIER Arctic Research and Development (ARD) was founded on a paradox. The Arctic is both the next great economic frontier and one of the most hostile environments on Earth. Rich in resources and strategically vital, yet bone-chillingly cold, dark for months, and fundamentally inhospitable to humans. This paradox - an explosion of activity in a place that resists human presence - is why we exist. Our solution is autonomy. We build systems that operate reliably and intelligently in the Arctic, so that humans don't always have to. Founded by record-holding pioneers with decades of polar experience, we take calculated risks on hard problems that matter. If you want to build and deploy ground-up technology with real-world impact, at an inflection point in history that won’t reappear, we’d like to talk. THE ROLE We’re looking for a Senior Firmware Engineer to join our small team to help develop high-reliability firmware for deployment into some of the most challenging places on earth. You will be writing firmware for embedded processors (ARM M4, M33 etc) interfacing with sensors and other products via SPI, I2C, TCP/IP, LoRA, UART and much more. You will have a real impact being responsible for firmware architecture, coding, testing and debugging across the ARD products. We want you to use your knowledge and experience to make key decisions and challenge other team members to make high quality products suitable for use in the Arctic. Core Responsibilities Design & Development — Design, develop, and maintain embedded firmware for microcontrollers and microprocessors, writing efficient, reliable, and well-documented code primarily in C/C++ or assembly language. Hardware Integration — Collaborate closely with hardware engineering teams to integrate firmware with electronic components, including sensors, communication interfaces (UART, SPI, I2C, CAN), and peripheral devices. Testing & Debugging — Perform unit testing, integration testing, and system-level validation of firmware, using tools such as oscilloscopes, logic analyzers, JTAG debuggers, and emulators to diagnose and resolve issues. RTOS & Boot Systems — Develop and optimize real-time operating system (RTOS) configurations, bootloaders, and interrupt-driven systems to meet strict timing and performance requirements. Code Quality & Version Control — Maintain high standards of code quality through peer reviews, adherence to coding standards, and use of version control systems (e.g., Git) to manage firmware releases and revisions. Cross-functional Collaboration — Work alongside software, mechanical, and QA teams throughout the product development lifecycle, contributing to technical documentation, design reviews, and supporting regulatory or compliance testing as needed. Requirements - Essential 5+ years of embedded firmware development experience in C for ARM or equivalent processors. Prior experience with the STM32 family of processors. Experience with RTOS and bare-metal design, in particular using FreeRTOS and ZephyrProven track record developing and delivering firmware from creating requirements, architecture design, implementation through to release including use of Git. Experience working with SPI, I2C, UART protocols. Understanding of bootloaders and OTA for updating multi-processor products. Experience debugging on real hardware and confidence using basic equipment such as logic analysers and oscilloscopes. Willingness to test in the field to prove functionality and compliance. Self-driven attitude and confidence working in a startup where you will be the subject matter expert. NICE TO HAVE Understanding of electronics design such as how to read a schematic and soldering. Degree in a related engineering discipline such as firmware, software or electronics is a plus however not essential. Experience is highly valued!TCP/IP and networking experience What we offer Competitive compensationPrivate Health Insurance from Day 1Dental & VisionMeaningful equity package reflecting early-stage contributionReal field exposure – travel to Arctic sites and Outposts when neededMission-driven culture – focus on impact, not hours logged. A Note On Who We Want To Hear From We're building for one of the most demanding environments on Earth and we believe diverse teams build more resilient systems. We actively welcome applications from people who are underrepresented in engineering - whether that's by gender, ethnicity, disability, or background. If you're not sure you meet every requirement, apply anyway and tell us what excites you about the problem.