Principal Python AI Engineer - FinTech & LLMs

Client Server Ltd.; Greater London; Hybrid; GBP 100,000 - 120,000; Full time

Benefits offered by this job

Pension

Job summary

Client Server Limited is recruiting a Principal Software Engineer (Python AI) for a FinTech environment in London. The role blends hands-on Python development with technical ownership, shaping product architecture and delivering new capabilities across backend, data processing and financial systems.

The position offers a hybrid working model, with three days in the City office and two days remote, and a salary up to £120k with pension benefits and strong development opportunities.

Qualifications

• Strong academic background with Oxbridge or Russell Group university and a 2.1+ in a STEM discipline (Computer Science preferred).
• Extensive commercial software engineering experience at Senior/Principal level.
• Expertise with Python development and Django or FastAPI, with ability to lead design from concept to production.
• Experience in AI and LLMs and applying them to products and development workflows.
• Ability to shape technical architecture and influence engineering decisions.
• Product-focused mindset balancing new development with improving existing systems.

Responsibilities

• Lead projects end to end, shaping architecture and driving delivery of new product capabilities.
• Hands-on Python development and collaboration across backend, data processing, and financial systems.
• Drive adoption of AI/LLM technologies across the engineering team.

Skills

Python development

AI/LLMs

Leadership of projects

Product-minded

Architectural thinking

FinTech domain knowledge

Education

Oxbridge or Russell Group degree

2.1+ in STEM (Computer Science preferred)

Tools

Django

FastAPI

Python

Job description

Client Server Limited is recruiting a Principal Software Engineer (Python AI) for a FinTech environment in London. The role blends hands-on Python development with technical ownership, shaping product architecture and delivering new capabilities across backend, data processing and financial systems.

The position offers a hybrid working model, with three days in the City office and two days remote, and a salary up to £120k with pension benefits and strong development opportunities.