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# Full Stack Engineer / Technical Lead B2B SaaS

- **Company:** Client Server
- **Location:** London, UK (Remote available)
- **Experience:** Expert
- **Salary:** £130,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, VoIP, Data Structures, Cursor (Graphical User Interface Elements), Software Design Patterns, Programming Tools, LiveChat, Object-Oriented Software Development, Open Source Technology, Ruby, TypeScript, ReactJS, Serverless Computing
- **Published:** July 3, 2026
- **Apply:** https://uk.indeed.com/viewjob?jk=553fa249d20f389d

## About the Role

* You're a senior software engineer with experience of building developer tooling and APIs
 * You have strong hands-on experience with Ruby, TypeScript and React
 * You have experience within a product focussed B2B SaaS environment
 * You have experience of making technical decisions that drive projects and raise the bar
 * You're comfortable with AI tools such as Claude and Cursor and understand how they can be used to optimise processes
 * You're customer and product focussed
 * You're collaborative and pragmatic with experience of technically leading and mentoring others
 * You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design Patterns

## Description

Join a leading serverless infrastructure company that processes billions of messages daily, powering real-time communications and services globally.

Full Stack Engineer / Technical Lead (Ruby TypeScript React) London / Remote to £130k

Opportunity for a full stack technologist to join a highly regarded provider of serverless real-time infrastructure for the Internet that processes billions of messages a day and powers everything from live chat and VoIP calls to real-time pricing and stock availability for a multitude of services around the globe.

As a Full Stack Engineer / Technical Lead you'll own the technical strategy and architecture for one or more Developer Ecosystems (iOS, Web, Infra/Automation), define and drive best practices for API and SDK design, ensuring consistency, usability and scalability and lead complex, cross-team initiatives to expand and improve client libraries.

You'll oversee the full development lifecycle, from design through to release, maintenance and product evolution, mentoring more junior engineers and reviewing contributions, raising the technical bar across the team. You'll also guide and manage external contributors and open-source collaboration and act as a key interface with the developer community, incorporating feedback into product direction.


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