Principal Firmware Engineer

Overview

As Principal Firmware Engineer you will own the low-level firmware design, development and debugging for next-generation SoC products in a fast-growing deep-tech semiconductor company. You’ll collaborate with hardware and architecture teams across the full lifecycle—from pre-silicon validation to post-silicon bring-up—shaping robust, secure embedded software. This role focuses on high-performance, secure firmware while solving complex system challenges. You will work in a London-based, hybrid environment and have a meaningful impact on secure, scalable SoC software.

Responsibilities

• own firmware design, development and debugging for SoC products
• collaborate with hardware and architecture teams
• drive the full firmware lifecycle from pre-silicon validation to post-silicon bring-up
• develop secure embedded software to meet high-security requirements
• contribute to robust and maintainable firmware suitable for production
• stakeholder communication with cross-functional teams

Key requirements

• Strong experience in C/C++ for low-level firmware
• Deep experience with ARM Cortex-M microcontrollers and peripherals
• Experience developing secure embedded software, including secure boot
• Knowledge of IoT or networking stacks (TCP/IP, Bluetooth, Wi‑Fi, Matter, Thread) is advantageous
• Ability to work closely with hardware and architecture teams on complex embedded systems
• Senior firmware engineering background with leadership potential

• collaboration with cross-functional teams
• problem solving in complex embedded systems
• proactive communication and ownership
• C/C++
• ARM Cortex-M
• secure boot

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