Harnham
Senior Software Engineer
Senior Software Engineer at Harnham, based in London, paying £115,000 - £140,000 per annum. This is a permanent role with hybrid working.
- Pay
- £115,000 - £140,000 per annum
- Hours and contract
- Permanent · Hybrid
- Location
- London
- Closing date
- Sector
- Software Developer
About 76% above the going rate for software developer
Reference https://www.harnham.com/job/e1aeb1da-8723-4ba1-d23d-08d5948a7341-senior-software
About the role
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Senior Product Engineer
London (Hybrid, 3 days)
Join a well-funded AI startup building a behavioural intelligence platform for financial services. As an early engineering hire, you’ll play a key role in shaping the product, architecture, and engineering culture while working closely with founders and senior leadership.
The Company
They are developing an AI-powered platform that helps organisations better understand customer behaviour and decision-making. With strong early customer traction and enterprise PoCs underway, they are now scaling their product and engineering capability.
The Role
- Build and scale LLM-enabled product features from concept to production
- Design APIs, backend systems, and AI-powered workflows
- Improve model quality through evaluation, monitoring, and guardrails
- Optimise token usage, performance, and cost efficiency
- Collaborate on product strategy, roadmap, and architecture
- Help establish engineering best practices as the team grows
Your Skills & Experience
- Strong product engineering background
- Experience building and launching an LLM-powered product
- Backend expertise, ideally with Node.js and TypeScript
- Experience with APIs, cloud infrastructure, and scalable systems
- Comfortable operating with autonomy in an early-stage environment
- Strong communication and stakeholder management skills
What They Offer
- £115,000 to £140,000 base salary
- Meaningful equity package
- Hybrid working in London
- Significant ownership and autonomy
- Opportunity to shape a product and engineering function from an early stage
To Apply for this Job Click Here
Reference: https://www.harnham.com/job/e1aeb1da-8723-4ba1-d23d-08d5948a7341-senior-software · Posted 2 days ago · Closes 5 Dec 2026 · Listed via Harnham
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