Senior Frontend Engineer (React)

Cognizant; Burgess Hill; Hybrid; GBP 70,000 - 95,000; Full time

Job summary

Cognizant is seeking a Senior Frontend Engineer in Burgess Hill for a hybrid, full-time role. You will design, develop, and deliver data-driven web apps, collaborating with a distributed team to meet business and compliance needs.

You will lead frontend architecture, implement state management, and mentor engineers while championing quality and performance through tests and reviews.

Qualifications

• Strong hands-on experience with React, TypeScript, and JavaScript (ES6+), including React Hooks and functional component patterns.
• Proficiency in HTML5 and CSS3, with an emphasis on accessible, responsive UI.
• Experience with Redux and/or Context API for state management and data-driven UIs.
• Experience writing and maintaining automated tests and adhering to quality standards.

Responsibilities

• Architect and develop scalable frontend applications using React, TS, and modern web tech.
• Lead state management strategies and build data-driven UI components including forms.
• Write automated tests, conduct code reviews, and promote engineering best practices.
• Connect frontend apps with RESTful APIs and ensure reliable data exchange.
• Mentor junior engineers and participate in agile ceremonies to drive improvements.

Skills

React

TypeScript

JavaScript (ES6+)

HTML5

CSS3

Redux

Context API

Agile

Mentoring

RESTful APIs

Education

Bachelor of Science or Engineering in IT/CS/Software Engineering

Tools

Redux

Context API

JSON

Job description

Senior Frontend Engineer (React / JavaScript)

Burgess Hill, United Kingdom | Hybrid | Full-Time

About the Role

As a Senior Frontend Engineer, you will make an impact by designing, developing, and delivering high-quality, data-driven web applications that power innovative digital products. You will be a valued member of a high-performance distributed engineering team and work collaboratively with cross-functional stakeholders, product managers, and fellow engineers to build scalable, performant UI solutions that meet real business and compliance needs.

This role offers a compelling blend of hands-on technical excellence and engineering leadership — ideal for a seasoned engineer who thrives on both building great software and growing the talent around them.

In This Role, You Will:

• Architect and develop scalable, high-quality frontend applications using React, TypeScript, JavaScript (ES6+), HTML5, and CSS3 — applying React Hooks and functional component patterns to deliver fast, accessible, and responsive user experiences.
• Lead and implement state management strategies using Redux and/or Context API, and develop data-driven UI components and dynamic forms — including JSON-schema based forms — to satisfy complex business and compliance requirements.
• Champion quality by writing and maintaining automated tests using React Testing Library or equivalent frameworks, conducting code reviews, and driving adherence to engineering best practices and performance standards across the team.
• Integrate and connect frontend applications with RESTful APIs and web services, ensuring seamless, reliable data exchange using JSON and related technologies.
• Mentor and elevate junior and mid-level engineers, contributing to the growth and effectiveness of a distributed engineering team whilst actively participating in agile ceremonies — including sprint planning, estimation, and retrospectives.

What You Must Have to Be Considered

• Strong hands-on experience with React, TypeScript, and JavaScript (ES6+), including React Hooks and functional component patterns, along with proficiency in HTML5 and CSS3.
• Strong experience with state management solutions such as Redux and/or Context API, and developing data-driven UIs and dynamic forms (including JSON-schema based forms).
• Strong experience writing and maintaining automated tests using React Testing Library or comparable testing frameworks, with a consistent focus on code quality and performance.
• Strong experience integrating frontend applications with RESTful APIs, with solid familiarity with JSON and web service technologies.
• Good experience working within agile development environments, contributing to code reviews, sprint ceremonies, and continuous improvement of engineering standards.
• Experience building, mentoring, and supporting high-performance distributed engineering teams.
• A Bachelor of Science or Engineering, specialising in Information Technology, Computer Science, or Software Engineering — or equivalent practical experience.

Additional eligibility requirements:

Candidates must currently reside in the UK.

Candidates must be available to start within 4 weeks of receiving an offer.

These Will Help You Stand Out

• Good knowledge of Java or other backend technologies and frameworks, enabling more informed full-stack collaboration.
• Experience with cloud technologies on any major cloud platform (AWS, Azure, or GCP).
• Experience with DevOps practices and tooling, particularly GitHub Actions and CI/CD pipeline management.
• Professional certifications in software engineering, architecture, or product management.