Founding Software Engineer Python - Start-up

Client Server; Greater London; Hybrid; GBP 100,000 - 115,000; Full time

Benefits offered by this job

Equity

Career growth opportunities

Job summary

Client Server in London and Cambridge is seeking a Founding Software Engineer to own the design and development of scalable cloud-native applications, primarily in Python and TypeScript, across the full stack and into CI/CD on Azure.

This hands-on, autonomous role lets you influence product decisions, engineering practices and technical direction alongside the founding team.

Qualifications

• Founding engineer who can own design and development across the full stack.
• Strong Python skills with frontend experience and modern web tech.
• Experience building cloud-native, scalable services and APIs.

Responsibilities

• Own architecture and development of cloud-native applications from backend to frontend.
• Lead CI/CD pipelines and deployment on Azure with robust testing.
• Collaborate with the founding team to set technical direction and practices.
• Influence product decisions and engineering culture in a fast-growing startup.
• Hands-on work with Python and TypeScript, shaping the product and tech roadmap.

Skills

Python

Full stack development

RESTful APIs

FastAPI

TypeScript

React

HTML5 / CSS3

LLMs / AI

Entrepreneurial mindset

Communication

Team collaboration

Education

Bachelor's degree in Computer Science or related

2:1 or higher

Masters/PhD preferred

Tools

Azure

CI/CD

Job description

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