Founding Python Backend Engineer for AI/API

Client Server; Greater London; Hybrid; GBP 40,000 - 70,000; Full time

Job summary

Client Server is hiring a founding engineer to build scalable AI-powered software in a fast-growing UK startup. You will own major backend services, contribute to frontend work, and shape technical direction with the founders in London and Cambridge.

You will work in a hybrid setup, two days in London and one day in Cambridge, with remote options and equity on offer. Strong Python, FastAPI, TypeScript, and AI experience are highly valued.

Qualifications

• Strong Python skills and experience with RESTful APIs (FastAPI).
• Degree in CS or related field, 2.1 or higher; MSc/PhD preferred.
• Experience with TypeScript, React, HTML5 and CSS3 is beneficial.
• Comfortable in a startup, unstructured environment; ownership and independent work.

Responsibilities

• Build scalable, cloud-native applications across the full SDLC.
• Own backend architecture and services, with frontend collaboration.
• Contribute to CI/CD and deployment on Azure, and establish engineering practices.
• Collaborate with founders to influence technical direction and solve engineering challenges.
• Build AI-powered products using agentic AI and LLMs.

Skills

Python

RESTful APIs

TypeScript

React

LLMs

Agentic AI

Ownership

Communication

Startup environment

Education

Bachelor's degree (2.1) in Computer Science or related

Tools

Azure

FastAPI

CI/CD

HTML5

CSS3

Job description

Client Server is hiring a founding engineer to build scalable AI-powered software in a fast-growing UK startup. You will own major backend services, contribute to frontend work, and shape technical direction with the founders in London and Cambridge.

You will work in a hybrid setup, two days in London and one day in Cambridge, with remote options and equity on offer. Strong Python, FastAPI, TypeScript, and AI experience are highly valued.