Founding Engineer Python Api Llm - Start-Up

Client Server; Greater London, Cambridge; Hybrid; GBP 104,000 - 127,000; Full time

Benefits offered by this job

Salary to £115k

Equity

Career growth opportunities

Job summary

Client Server seeks a Founding Engineer to own the design and development of cloud-native applications, primarily using Python and TypeScript. You will shape technical direction while working with AI technologies to deliver real-world solutions.

The role involves building from architecture to frontend, CI/CD, and Azure deployment, with strong ownership and startup pace. London/Cambridge hybrid, flexible WFH.

Qualifications

• Own the design and development of scalable cloud-native applications.
• Work across the full software development lifecycle, from architecture to deployment.
• Collaborate with the founding team to shape technical direction and engineering practices.
• Build with Python and TypeScript, leveraging AI technologies to create real-world solutions.

Responsibilities

• Lead backend services and frontend work through to CI/CD.
• Architect solutions and drive implementation across teams.
• Participate in architecture discussions and contribute to engineering culture.
• Ship high-quality software with emphasis on reliability and scalability.

Skills

Python

RESTful APIs

AI/LLMs

Entrepreneurial spirit

Education

BSc Computer Science or related

MSc/PhD preferred

Tools

FastAPI

TypeScript

React

HTML5

CSS3

Azure

Job description

Founding Engineer / Developer (Python API LLM) to £115k

Do you have advanced Python skills combined with tech start-up experience?

You could be progressing your career at a fast growing AI start-up as a Founding Engineer, building technology that is transforming compliance and operational efficiency across the NHS and wider regulated industries. With strong backing and ambitious growth plans, you'll have the chance to make a genuine impact while working alongside experienced founders in a highly collaborative environment.

As a Founding Engineer, you'll take ownership of the design and development of scalable, cloud-native applications, working across the full software development lifecycle, from architecture and backend services through to frontend development, CI/CD and deployment on Azure.

You'll collaborate closely with the founding team to influence technical direction, solve complex engineering challenges and establish the engineering practices that will underpin the company's future growth.

You'll work primarily with Python and TypeScript, leveraging AI technologies to build innovative products that solve real world problems. This is a hands-on role with plenty of autonomy, where you'll have a direct influence on product decisions, architecture and engineering culture.

Location / WFH:

You'll join the team in London two days a week, with one day a week in Cambridge too (expenses covered) and flexibility to work from home.

About you:

• You enjoy taking ownership and can build software from scratch and iterate quickly
• You have strong technical skills, primarily with Python
• You have experience with RESTful APIs (they use FastAPI); TypeScript, React and other web technologies such as HTML5, CSS3 would be of benefit
• You have experience with LLMs and agentic AI, like to get your hands dirty and have a proactive entrepreneurial spirit
• You're curious by nature, happy to learn and pick up new things
• You're keen to work in a start-up environment, comfortable with unstructured environments
• You're collaborative with great communication skills
• You are degree educated, minimum 2.1 at BSc from a top tier university, Computer Science or closely related discipline preferred, likely to have studied to MSc / PhD

What's in it for you:

• Salary to £115k
• Equity
• Impactful role with excellent career growth opportunities

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Founding Engineer Python API LLM - Start-up London, England