London & South East · 2026 Data
Senior Software Engineer Salary in London (2026)
Senior Software Engineer salaries in London range from £75,000 to £130,000, with a median of £95,000.
Salary Range
Full-Time vs Fractional Cost
Full-Time Senior Software Engineer
- Base salary £75,000 – £130,000
- Employer NI & pension ~20-25%
- Total annual cost £94,000 – £163,000
Fractional (2 days/week)
- Day rate £600 – £1,100/day
- Employer costs None
- Total annual cost £62,400 – £114,400
Fractional cost based on 2 days/week, 52 weeks. Actual costs vary by engagement structure.
What Does a Senior Software Engineer Do?
Senior Software Engineer building and maintaining complex systems, conducting code reviews, and contributing to technical design decisions.
In London, Senior Software Engineers typically work across the London & South East tech ecosystem. The local market offers salaries ranging from £75,000 for less experienced candidates to £130,000 for senior professionals with significant track records.
Frequently Asked Questions
What is the average Senior Software Engineer salary in London?
The median Senior Software Engineer salary in London is £95,000 in 2026. Salaries range from £75,000 at the lower end to £130,000 for the most experienced professionals.
How does London compare to London for Senior Software Engineer salaries?
London offers the highest Senior Software Engineer salaries in the UK, with a median of £95,000. Other major cities typically pay 20-35% less.
Is it cheaper to hire a fractional Senior Software Engineer than a full-time one in London?
Yes. A full-time Senior Software Engineer in London costs approximately £94,000 to £163,000 per year including employer costs. A fractional Senior Software Engineer at 2 days per week costs roughly £62,400 to £114,400 annually — typically 40-60% less.
What does a Senior Software Engineer do?
Senior Software Engineer building and maintaining complex systems, conducting code reviews, and contributing to technical design decisions.