IT Recruitment Solutions
Principal Software Engineer - Python / AI
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Principal Software Engineer wanted by a well-funded, early-stage company building a customer-facing AI software platform.
Our client recently completed their Series A round and are now making several senior engineering hires as they continue developing the product and expanding its use among customers.
About the Role
This is first and foremost a software engineering position. They need someone who can build reliable products across backend services, integrations, infrastructure and, where required, the frontend.
You will also need genuine experience building LLM or agentic systems that have progressed beyond prototypes and into production.
Responsibilities
- Building and shipping core product features across Python and cloud infrastructure
- Developing reliable asynchronous Python services
- Building LLM and agent-based functionality into the product
- Designing event-driven systems and third-party integrations
- Working directly with customers to understand problems, scope solutions and deliver working software
- Deciding when an MVP is appropriate and when something needs to be built for longer-term scale
- Maintaining strong standards across testing, documentation, security and reliability
- Helping shape the technical direction of the product as the engineering team grows
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Requirements
- Excellent Python development experience, including asynchronous and concurrent services
- Experience designing, building and shipping production software
- Hands-on experience building LLM applications or agentic systems used by customers
- Experience with cloud infrastructure, Kubernetes, serverless platforms or distributed systems
- Early-stage startup experience, ideally at Series A or earlier
- The ability to work directly with non-technical customers and take ownership from initial requirement through to delivery
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TypeScript, customer-facing integrations and event-driven architecture would all be useful, but they are not essential.
This would not suit someone whose experience is predominantly academic machine learning, data science or AI strategy. They need an engineer who still writes production code and is comfortable owning difficult technical problems from start to finish.
Compensation
The salary is £150,000 to £250,000 plus equity, depending on experience.
Location
Please note that the role is based in the company’s central London office five days per week.
Application
To apply, send your CV to Paul Wilson at IT Recruitment Solutions.
Technologies
Principal Software Engineer, Python, FastAPI, LLM, AI Agents, Agentic AI, TypeScript, Kubernetes, GCP
Job Details
Permanent, Central London, Onsite £150,000 - £250,000 plus equity
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