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Senior Python/ Java Engineer - Backend

Senior Python/ Java Engineer - Backend

On site

London, United kingdom

£ 78,000 /year

Senior

Freelance

09-02-2026

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Skills

Python Java AWS SDLC OpenAI

Job Specifications

Build cloud-native, AI-driven platforms within a tier-one financial services environment.

We're working with a global financial institution on a large-scale engineering programme and are looking for a Senior Java / Python Engineer to deliver high-impact backend systems on AWS, with exposure to modern AI and LLM-based solutions.

What's in it for you

Annual Salary up to £70,000 - £78,000 per annum (DOE)
12-month contract - Inside IR35 - PAYE
5 days on-site, Central London
Enterprise-scale systems and long-term programme work

What you'll be doing

Designing and building backend services using Java and/or Python
Delivering cloud-native applications in AWS environments
Working with AI/ML solutions, including LLM inference and RAG-based semantic search
Owning the full SDLC: system design, development, testing, deployment, and operational stability

What we're looking for

Strong commercial experience with Java and/or Python
Hands-on experience delivering systems on AWS
Solid understanding of cloud-native and distributed architectures
Exposure to AI/ML platforms, ideally LLM-based solutions (e.g. RAG, OpenAI, Claude)
Experience working in regulated or enterprise environments

Interested?

Apply now for immediate consideration. For a confidential discussion, feel free to get in touch.

About the Company

Welcome to Principle's LinkedIn profile page! We are a globally recognised, multi-award-winning recruitment agency specialising in partnering with MSPs and organisations to place contingent and permanent workers across various sectors, including Technology, Engineering, Media, Marketing, Operations, Legal, Finance, and HR in Ireland and the UK. At Principle, we are proud champions of Diversity, Equity, and Inclusion (DE&I) and are a diverse-owned recruitment agency certified as Women Owned by WEConnect International. Our c... Know more