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Opus Recruitment Solutions
Senior Software Engineer - AI Start Up - 4 Days Onsite - Up to £200k - FastAPI, LLMS

Senior Software Engineer - AI Start Up - 4 Days Onsite - Up to £200k - FastAPI, LLMS

Hybrid

London, United kingdom

Senior

Full Time

26-11-2025

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Skills

Python FastAPI

Job Specifications

I’m working with an innovative AI start-up company that’s transforming how brands sell through chatbots using a Gen AI-powered platform.

They’re looking for a Senior Software Engineer who has experience building and deploying AI agents with LLMs, and strong skills in Python and FastAPI.

What You’ll Do

Design and deploy AI agents that leverage LLMs for real-world commerce applications
Build agentic workflows and autonomous systems that digest complex business documents
Develop APIs and backend services using Python and FastAPI
Collaborate closely with product and AI teams to deliver cutting-edge solutions

What We’re Looking For

Proven experience deploying AI agents and agentic systems (not just fine-tuning models)
Strong skills in Python and FastAPI
Deep understanding of LLM-based architectures and autonomous workflows
Ability to thrive in a fast-paced, early-stage environment

Why this role stands out:

Work on cutting-edge AI technology shaping the future of conversational commerce
Build autonomous systems that digest complex business documents and create tailored AI models
Salary up to £200k
4 days onsite in London
Offers sponsorship

About the Company

When it comes to technology talent, Opus Recruitment Solutions are the specialists. We provide the skills needed most to markets at the forefront of change, evolving with the ever-changing needs of our clients to propel their people strategy and build world-class teams to power the future. With a global reach, diverse networks and an established market reputation, we are the partner of choice for organisations looking for flexible and trusted technology talent solutions to achieve long-term success. Our clients work acros... Know more