Prinicpal Software Engineer

Job description

Principal Software Engineer

London - Hybrid

Up to £140k + bonus

We're working with a profitable, engineering-led fintech that builds software used by investment firms to manage reporting, data, and client-facing outputs.

Their platform underpins core workflows for their clients - handling complex, highly tailored requirements across data processing, reporting logic, and content generation. They’re now at a key stage of growth: evolving the existing system while building out new products alongside it.

They’re looking for a Principal Engineer to take ownership of how that platform develops from here. This is a senior, hands-on position with real influence over both architecture and delivery.

You’ll be:

• Leading the evolution of a live, business-critical Python platform
• Designing and building new systems and features from the ground up
• Owning architectural decisions across backend services and cloud infrastructure
• Working closely with stakeholders to shape solutions, not just implement them
• Setting technical direction and raising engineering standards within a small team

What They’re Looking For:

• Strong Python experience (FastAPI, Django, Flask etc)
• Track record of owning or significantly evolving production systems
• Experience making architectural decisions and working across the full lifecycle
• Comfortable operating in a smaller, high-ownership environment
• Able to communicate effectively with both technical and non-technical stakeholders

Why It's interesting:

• Ownership of a core platform and its future direction
• Worldwide travel insurance
• Top-tier Medical + Dental insurance
• Beautiful, modern office in Central London
• Profitable company with a clear growth roadmap

Extra information

Status

Open

Education Level

Secondary School

Location

City of London

Type of Contract

Full-time jobs

Published at

02-05-2026

Profession type

Accountancy

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English