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SR2 | Socially Responsible Recruitment | Certified B Corporation™
Staff Software Engineer

Staff Software Engineer

On site

London, United kingdom

£ 150,000 /year

Full Time

09-02-2026

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Skills

Python Research cloud platforms FastAPI

Job Specifications

Staff Python Engineer | London | £100k to £150k + benefits | FastAPI

Salary: £100,000 - £150,000

Location: London

This is an exceptional individual contributor role for engineers who want to work on problems that actually matter and be in an environment where you're not the smartest person in the room.

You will be building backend systems that support advanced AI research and deployment decisions. The software you work on influences how complex models are tested, understood, and monitored before they reach the real world.

This is serious engineering in a fast moving space, with high expectations around quality, reliability, and judgement.

What you will work on

Building and improving backend systems used by internal teams every day using FastAPI
Working on tools that operate at scale and need to be both fast and dependable
Helping shape how new systems are designed and brought into production
Collaborating closely with technical stakeholders to solve ambiguous problems
Taking real ownership over the software you build

Most of the work is Python, but this is not scripting. You will be designing systems that need to be correct, performant, and maintainable under real load.

What makes this role different

You are close to the problem, not buried under layers of abstraction
You work directly with stakeholders and influence how tools are designed
You will own features end to end, from idea through to production use
Engineering standards are high, but speed still matters
This is a role where judgement counts more than dogma

What they are looking for

Backend engineers who enjoy complexity and responsibility and have at least 5 years+ experience
People who care about code quality but know when to move quickly
Engineers who think in systems, not just features
Experience with or an interest in LLMs
Those motivated by the impact of AI and how it is developed

Experience with LLMs, agents, cloud platforms, or security is a bonus, not a requirement.

This is a career-defining role for someone who wants to stay deeply technical and work on problems that will only become more important over the next decade.

If you’re looking for a role where you can make tangible impact, work on an interesting product, and be part of an exceptional team, get in touch at imogen@sr2rec.co.uk.

About the Company

Built to Make an Impact. We exist to harness the power of recruitment to create meaningful change across the world. Our mission is simple but profound: to connect purpose-driven talent with industries that shape a better future. From driving innovation in Tech for Impact, advancing the global Clean Energy transition, to empowering Central Government Public Services, we are a Global Recruitment Group committed to making an impact and leaving a positive legacy. Why We Exist We believe recruitment should do more than fil... Know more