Senior Front End Engineer React - PoS

Client Server Limited; Greater London; Hybrid; GBP 81,000 - 99,000; Full time

Benefits offered by this job

Pension

Potential equity

Career progression

Job summary

Client Server Limited in London is seeking a Senior Front End Engineer to own the front end for the core product, a financial operating system for live events which reduces queue times for customers and maximises revenue for vendors.

You will lead the architecture and development of front end applications, primarily using React, ensuring performance, maintainability and scalability across web products, remaining hands-on with the code.

Qualifications

• Experience leading or shipping as a senior Front End Engineer using React.
• Strong knowledge of modern JavaScript/TypeScript, component driven architecture.
• Ability to own frontend architecture and make technical decisions.

Responsibilities

• Lead architecture and development of front end applications using React.
• Collaborate with product and design teams to translate requirements into interfaces.
• Work with backend engineers to integrate APIs and real‑time data.
• Mentor junior developers and conduct code reviews.

Skills

Leadership

Communication

Ambiguity tolerance

Tools

React

TypeScript

Redux

Context API

Job description

Senior Front End Engineer / Developer (React) London / WFH to £90k

Would you like to join a scale-up technology company in an influential role where you can take ownership and see the business impact of what you do?

You could be progressing your career as a Senior Front End Engineer, taking ownership of the Front End for the core product, a financial operating system for live events which reduces queue times for customers and maximises revenue for vendors.

As the Senior Front End Engineer you will lead the architecture and development of front end applications, primarily using React, ensuring performance, maintainability and scalability across web products, remaining hands-on with the code.

You'll collaborate closely with product and design teams to translate requirements into polished, accessible and responsive user interfaces and partner with backend engineers to integrate APIs, payment flows and real-time data.

You will have the autonomy to make critical technical decisions on front end tooling, architecture and build / release pipelines and mentor more junior front end developers, conducting code reviews and ensuring best practices.

Location / WFH:

Initially (first 6 months) you'll be expected to join the team in the London office 3-4 days a week so you can get a full understanding of the product and the team, following this there's lots of flexibility including the ability to work abroad for part of the year.

About you:

• You have experience of working on PoS, hospitality or events systems
• You have experience as a lead or senior Front End Engineer / Developer, with advanced, hands-on skills in React
• You have a strong knowledge of modern JavaScript / TypeScript, component driven architecture and state management (e.g. Redux, Context API)
• You have experience building responsive, cross-browser, high-performance web applications at scale
• You're comfortable taking ownership and making the technical decisions
• You're keen to work in a start-up / scale-up environment, comfortable with ambiguity and changing priorities
• You have excellent communication and collaboration skills

What's in it for you:

• Salary to £90k
• Pension
• Influential role with great career progression as the company scales
• Potential equity