Founding Software Engineer Python - Start-up

Client Server Limited; City Of London; Hybrid; GBP 100,000 - 115,000; Full time

Benefits offered by this job

Equity

Job summary

Client Server Limited in London is seeking a Founding Software Engineer (Python) to shape product and technology in an early-stage AI start-up. You'll own design and build scalable, cloud-native apps using Python and TypeScript, across backend and frontend, with CI/CD and Azure deployments; collaborate with the founding team to set engineering direction.

You’ll work two days a week in London and one day in Cambridge (expenses covered) with the option to work from home; equity and meaningful

Qualifications

• Degree educated, minimum 2.1 in Computer Science or related discipline.
• Strong Python skills and ability to build software from scratch.
• Experience with RESTful APIs, TypeScript, React; web tech beneficial.

Responsibilities

• Own design and development of scalable, cloud-native apps across the full SDLC.
• Work across backend services through to frontend, CI/CD and deployment on Azure.
• Collaborate with the founding team to influence technical direction and engineering culture.

Skills

Python

RESTful APIs

TypeScript

React

HTML5

CSS3

LLMs/Agentic AI

Education

Bachelor's degree in Computer Science or closely related discipline

MSc/PhD preferred

Tools

FastAPI

Azure

CI/CD

Job description

Founding Software Engineer Python - Start-up (PR/100924) London, England

Salary: GBP100000 - GBP115000 per annum + benefits

Founding Software Engineer (Python) to £115k

Are you an ambitious full stack Software Engineer who thrives in early-stage environments where you can shape both the technology and the product?

You could be joining a fast-growing AI start-up as one of its founding engineers, helping to build 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 Software 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