Principal / Staff level Firmware Engineer
London (Primarily office-based) – open to great candidates looking to relocate to London.
Up to £110k + meaningful equity
This is a really special role for an experienced Firmware Engineer. This is a chance to build the firmware behind a product the world hasn’t seen yet…
Our client are building a consumer wearable that doesn’t exist yet. Not a better version of something already on the market – a genuinely new platform. It aligns the rhythms of sound and the body in real time. And here, the firmware isn’t just supporting the product. The firmware is the product.
The prototypes work. The data is real. Manufacturing has begun.
Behind the product is an outstanding and experienced founding team, supported by an exceptional investors and advisors. The team includes people from Meta, Google and Dyson, all working with a modern embedded stack and embracing AI-assisted software development—with humans firmly in the loop.
Perhaps most importantly, this is a rare opportunity to work without years of technical debt or legacy constraints. Instead, you’ll help define the architecture and engineering foundations that everything else will be built upon. The decisions made today will shape not just one product, but an entire smart wearables platform.
At 9 people currently, nothing sits between your decisions and what ships.
The Opportunity
You’ll join the small firmware team at the centre of the product, tackling the deepest technical challenges and helping guide architecture from advanced prototypes through to production. This is a hands-on engineering role with genuine ownership, working alongside hardware, software and machine learning to solve difficult real-world problems.
What You’ll Be Doing:
- Designing and developing production-quality embedded firmware
- Contributing to firmware architecture from concept through release
- Working closely with hardware, software and ML engineers
- Shipping reliable, maintainable and scalable embedded systems
- Helping shape technical direction through sound engineering judgement
- Solving complex challenges across embedded systems and real-time signal processing
We’re Looking For:
- Strong commercial experience with Embedded C/C++
- Experience with real-time signal processing
- A track record of shipping production firmware
- RTOS experience (Zephyr, FreeRTOS or similar)
- An ownership mentality and the confidence to work through ambiguity
- Strong engineering judgement and a passion for building things properly
Nice to Have:
- DSP experience
- Qualcomm Audio or NXP platforms
- Bluetooth Low Energy
The Culture:
- Engineers take ownership rather than wait for permission
- Care deeply about engineering quality
- Move quickly while making thoughtful technical decisions
- Continuously improve how they work
- Embrace modern AI-assisted software development while keeping engineering judgement at the centre
Why Join?
- Very competitive salary plus genuinely meaningful equity
- The chance to build a category-defining consumer product from the ground up
- Modern technology, a clean architecture and no legacy baggage
- Exceptional technical ownership from day one
- Work alongside world-class engineers from companies including Meta, Google and Dyson
If you’re an experienced firmware engineer who enjoys solving genuinely difficult technical problems and wants to help build something entirely new from first principles, we’d love to have a confidential conversation.
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