Senior Frontend Developer

The ONE Group Ltd; Cambridge; On-site; GBP 50,000 - 70,000; Full time

Job summary

The ONE Group Ltd is seeking a Mid–Senior Front-End Developer to join their team in Cambridge. You'll be responsible for designing and building modern web applications using React or Angular, taking projects from prototypes to full deployment. With over 5 years of experience in front-end development and a solid understanding of architecture and tooling, this role will involve collaboration with engineers and researchers in a fast-paced, research-heavy environment. This position offers an exciting opportunity to make an impact and grow within the company.

Qualifications

• 5+ years’ commercial experience in front-end development.
• Strong experience with React or Angular.
• Ability to understand Python-based codebases.

Responsibilities

• Lead the design and development of modern web applications.
• Ensure performance, scalability, and maintainability of front-end systems.
• Mentor and support other front-end developers.

Skills

Front-end development

React

Angular

API integration

Python

Problem-solving

Communication

Job description

Are you a frontend software developer with experience in React or Angular? If yes, this could be your ideal next role!

A well-funded, research-led technology start-up is seeking a Mid–Senior Front-End Developer to join its growing team in Cambridge.

This is a high-impact role where you’ll take ownership of front-end development, working closely with engineers and researchers to translate complex systems into intuitive, production-ready user experiences.

The Role

As a Front-End Developer, you will lead the design and development of modern web applications - taking products from early-stage prototypes through to full production deployment.

You’ll work in a highly technical, fast-paced environment, collaborating with backend engineers and research teams to build interfaces for sophisticated AI-driven systems.

While this role will evolve into leading a small front-end function, it remains hands-on and development-focused.

What You’ll Be Doing:

• Designing, building, and maintaining modern front-end applications using React or Angular.
• Taking ownership of projects from prototype through to production deployment.
• Translating complex technical workflows into clean, user-friendly interfaces.
• Ensuring performance, scalability, and maintainability of front-end systems.
• Contributing to architectural decisions across the wider platform.
• Mentoring and supporting other front-end developers as the team grows.
• 5+ years’ commercial experience in front-end development.
• Strong experience with React or Angular (experience with both is advantageous).
• Proven ability to own and deliver front-end projects end-to-end.
• Solid understanding of modern front-end architecture, state management, and tooling.
• Experience working with APIs and backend-integrated systems.
• Ability to read and understand Python-based codebases (particularly research prototypes).
• Strong problem-solving skills and ability to work independently.
• Excellent communication skills when working across technical disciplines.
• Experience working on LLM-powered or AI-driven applications.
• Exposure to agentic workflows or complex computational systems.
• Background in start-ups or early-stage environments.
• Experience building developer tools, dashboards, or technical UIs.

Who You Are:

• Comfortable operating in a fast-moving, research-heavy environment.
• Curious and motivated by technically challenging problems.
• Able to bridge the gap between complex backend systems and user experience.
• Proactive, adaptable, and ownership-driven.
• Interested in working closely with highly technical engineers and researchers.