Senior Software Engineer

Job description

Senior Software Engineer | Python | AI Systems | London | £120k to £160k + Equity

Location: London hybrid

Salary: £120k to £160k + meaningful equity

Building AI systems is easy. Building AI systems that behave predictably in production is not.

We are working with a well funded Series A startup tackling exactly that problem. Their platform captures operational knowledge and turns it into production grade systems that AI can interact with safely and reliably. The focus is not foundation model development or experimental agents. The real challenge is the engineering around AI. Evaluation, control, reliability and designing systems that behave consistently in production.

The engineering team is small, senior and deeply technical. Engineers work directly with users, own problems end to end and help shape both the technical architecture and product direction. It is an environment where correctness, thoughtful design and long term system quality genuinely matter.

If you enjoy solving difficult systems problems and building software that actually holds up in the real world, this is a rare opportunity.

Tech stack

• Python (FastAPI, Django or Flask) - experience across Rust, Golang, C++ useful
• AWS (experience with Azure or GCP also useful)
• Cursor and Claude Code
• SQL and strong database design

What you will work on

• Designing and building backend systems that power a complex AI platform
• Developing ingestion pipelines and integrations with production customer systems
• Owning schemas, data models and backend architecture with a focus on correctness and scale
• Building tooling that enables AI capabilities while maintaining strong control and evaluation standards
• Working directly with customers to translate workflows into reliable systems

What they are looking for

• Strong backend or systems engineering experience
• Deep Python experience or equivalent strength in a strongly typed language
• Strong SQL and schema design skills
• Experience building complex systems that evolve over time
• Comfort working in early stage environments with high ownership and ambiguity

Why join

• Small, exceptional engineering team
• High ownership and autonomy
• Meaningful equity
• Direct influence on product and technical direction

If this sounds interesting, get in touch: imogen@sr2rec.co.uk

Senior Software Engineer | London | £120k to £160k | Python | FastAPI | AWS

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

03-04-2026

Profession type

ICT

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