Senior Full Stack Developer TypeScript React API

Client Server; Greater London; On-site; GBP 72,000 - 120,000; Full time

Benefits offered by this job

Bonus

Job summary

Client Server is hiring a Senior Full Stack Engineer for London onsite to £120k. You will join early in the UK operation, owning architecture, design decisions, and building products from ground up in a hands-on start-up environment.

This role requires strong TypeScript/React skills, backend services, and APIs, with optional Rust knowledge. You’ll ship consumer products, own features end-to-end, and contribute to data reporting in a small team.

Qualifications

• Strong full-stack skills: TypeScript, React, backend services and APIs, with Rust knowledge preferred.
• Experience shipping consumer-facing products, ideally direct-to-consumer subscriptions.
• Own features end-to-end from design through release and data reporting in a small team.
• Experience with AI tooling to accelerate development and recommend AI use.
• Collaborative with strong problem-solving skills; startup/scaleup background.
• Experience building real-time systems, in-play chat, live sports data or betting tech is a plus.

Responsibilities

• Own full software development lifecycle from design to production.
• Architect, design, and implement features for the UK operation.
• Collaborate with a small team and take ownership of end-to-end delivery.
• Ship consumer products and report data insights.

Skills

TypeScript

React

APIs

Rust

Subscription experience

AI tooling

Startup experience

Real-time data

Job description

Senior Full Stack Engineer / Developer (TypeScript React API Rust) London onsite to £120k

Opportunity for a Senior / Founding Full Stack Developer to join a fast growing sports technology business as it establishes its new UK operation.

The company sits at the intersection of sports, data, digital insights and betting, working across major US sports including the NFL, NBA, baseball and hockey, with further expansion into college football underway.

As a Senior Full Stack Developer, you'll be one of the first engineers in the UK and will have genuine founding engineer ownership - shaping architecture, making technology decisions and building products from the ground up.

This is a hands-on role for someone who thrives in a start-up environment and is comfortable owning the full software development lifecycle, from design and development through to testing, deployment and production.

Location:

You'll join a small team in an attractive area of London on a fulltime basis (Monday to Friday).

About you:

• You have strong full stack software engineering skills: including TypeScript, React, backend services and APIs - ideally you'll also have some knowledge of Rust
• You have experience shipping consumer facing products, ideally direct-to-consumer subscription experience
• You're comfortable owning features end to end, from design through release and data reporting, in a small team environment
• You've used AI tooling to accelerate development and can make recommendations to the team on effective ways to use AI in development
• You're collaborative with strong problem solving skills
• You have experience of working in start-ups / scaling companies
• Experience building real-time systems, in-play chat, live sports data or betting related technology would be particularly relevant

What's in it for you:

• Salary to £120k
• Bonus
• Impactful with excellent career growth as the company scales