Principal AI Engineer

Principal AI Engineer wanted by a rapidly scaling AI company building customer facing products with real world use.

They are looking for a hands-on engineer who can build across the stack, work closely with customers and take products from an initial idea through to production as a solo contributor.

This position would suit someone who relishes working in the thrust of the startup world and enjoys the pace, ownership and variety that comes with it. You will primarily work with Python, FastAPI and PostgreSQL, with Type Script and Next.js on the front end. The platform is hosted on GCP using Kubernetes.

You will be responsible for:

• Building and shipping AI product features across backend, frontend and cloud infrastructure
• Developing production systems using Python, LLMs and third-party integrations
• Working directly with customers to understand requirements and deliver practical solutions
• Building reliable asynchronous Python services and event-driven systems
• Making sensible decisions around rapid delivery versus longer-term scalability
• Maintaining high standards across testing, documentation, security and reliability

We are looking for:

• Has designed, built and shipped Agentic AI products into the market
• Experience of building LLM agents that are being used in real world scenarios
• Strong asynchronous Python development experience, including coroutines and robust error handling
• Experience with Kubernetes, serverless platforms or distributed systems
• Type Script development in addition to Python a strong bonus
• Previous experience in the start-up world.
• The confidence to scope and deliver technical solutions directly with customers
• Computer Science / AI focused MSc highly desired

Experience with voice AI, CRM integrations or founding a startup would be highly beneficial.

This Principal AI Engineer role is an engineering led position and would not suit someone coming from a predominantly data science or academic machine learning background. We are looking for those who can evidence AI agents and LLM products being used by customers / end users in the real world.

In return, the company offers a salary between £200,000 and £250,000 per year plus benefits.

Please note, this position is based full time from their central London office, five days per week.