Senior Software Engineer Full Stack - Start-up

Client Server Ltd.; Greater London; Hybrid; GBP 80,000 - 95,000; Full time

Job summary

Client Server Ltd. is seeking a Senior Software Engineer (Full Stack) to join a greenfield project in London.

You will help design and build a modern cloud native platform using Node.js, TypeScript, React and Azure/AWS, taking ownership of backend services, APIs and cloud infrastructure. You’ll work in a small, high-ownership engineering team, collaborate with the CTO, and contribute to AI-powered features while maintaining code quality and security.

Qualifications

• Strong Full Stack development experience with Node.js, TypeScript and React.
• Experience designing scalable APIs and cloud native applications.
• Experience setting up serverless architectures with Microsoft Azure or AWS.
• Experience integrating enterprise systems and building event driven solutions.
• Comfortable with Infrastructure as Code and CI/CD pipelines.
• Experience using AI assisted development tools such as GitHub Copilot, Cursor or Claude.
• Enjoy working in collaborative, start-up style environments with high levels of ownership.

Responsibilities

• Own architecture and shape design from day one in a Greenfield project.
• Design and build a modern cloud native platform using Node.js, TypeScript, React and Azure/AWS.
• Develop scalable APIs, event driven integrations and cloud infrastructure.
• Establish IaC practices, CI/CD pipelines and coding standards with CTO.
• Collaborate with CTO and engineering team to accelerate delivery in an AI-first environment.
• Work across backend and frontend, including frontend enhancements and integrations.

Skills

Full Stack experience

Node.js

TypeScript

React

APIs design

Cloud native apps

CI/CD pipelines

Infrastructure as Code

AI tools (Copilot/Cursor/Claude)

Tools

Azure

AWS

Serverless

IaC

GitHub Copilot

Cursor

Claude

CI/CD tooling

Job description

Senior Software Engineer Full Stack - Start-up

London, Greater London | £80k - £90k per year

Senior Software Engineer / Full Stack Developer (Node TypeScript React) London / WFH to £95k

Are you a senior Software Engineer looking for a genuine Greenfield opportunity where you'll shape architecture from day one?

You could be joining a growing financial services business as they build a brand new product that will transform how financial advisers work. This is a high impact role within a small, experienced engineering team where you'll work directly with the CTO, influence technical decisions and see the immediate impact of your work.

As a Senior Software Engineer, you'll help design and build a modern cloud native platform, setting up serverless platforms from the ground up using Node.js, TypeScript, React and Microsoft Azure.

Working across the full technology stack, you'll take ownership of backend services, APIs, integrations and cloud infrastructure, whilst also contributing to frontend development. The platform will incorporate AI powered capabilities including meeting transcription, automated report generation and intelligent workflow automation.

You'll be hands-on, designing scalable APIs, building event driven integrations, developing Infrastructure as Code and establishing engineering standards, CI/CD pipelines and architecture alongside the CTO. Working in an AI first engineering environment, you'll use modern AI development tools to accelerate delivery while maintaining ownership of code quality, security and technical design.

Location / WFH:

You can work from home most of the time, meeting up with colleagues in the London office once or twice a week.

About you:

• You have strong Full Stack development experience with Node.js, TypeScript and React
• You have experience of designing scalable APIs and cloud native applications
• You have experience of setting up serverless architectures with modern cloud tools Microsoft Azure or AWS
• You have experience integrating enterprise systems and building event driven solutions
• You're comfortable working with Infrastructure as Code and CI/CD pipelines
• You have experience of using AI assisted development tools such as GitHub Copilot, Cursor or Claude
• You enjoy working in collaborative, start-up style environments with high levels of ownership

What's in it for you:

• Salary to £95k
• Impactful role with excellent progression as the company scales