Principal Firmware Engineer Salary in London (2026)
Principal Firmware Engineers in London earn a median base salary of £105K per year, based on 406 verified data points. This guide covers salary ranges, total comp, and negotiation tactics specific to the principal level in 2026.
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Firmware Engineer salary by level in London
See how principal-level pay compares to other seniority bands for the same role and location.
* Figures are approximate estimates relative to the principal-level verified data above.
What does a Principal Firmware Engineer earn in London in 2026?
The median base salary for a Principal Firmware Engineer in London is £105K per year, with the 25th–75th percentile range spanning £91K–£124K. Total annual compensation — including bonuses and equity — typically reaches £126K at the median for principal-level engineers.
At the principal level, engineers own cross-organisational technical strategy. The Principal level is the individual contributor equivalent of a Director, and compensation reflects both the scarcity of this talent and the leverage these engineers provide.
To negotiate effectively, open at £116K — the 65th percentile for this level and location — which gives you room to settle above median while appearing reasonable. Know your walk-away floor: £91K.
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Top-paying companies for Principal Firmware Engineers in London
| Company | Median Base |
|---|---|
| Revolut | £171K |
| Monzo | £156K |
| Google London | £209K |
| Meta London | £205K |
| Deliveroo | £144K |
| Wise | £162K |
| Checkout.com | £167K |
Skills that pay more at the principal level
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