Senior React Developer

Role Overview

• Seeking an experienced Senior React Developer to design, build and maintain modern, enterprise-grade web applications. Successful candidate will bring strong expertise in React, TypeScript, API-driven architectures and component-based user interface development. Familiarity with Pega Constellation, Pega DX APIs or a comparable low-code or case management platform would be highly desirable.
• You will work within an agile, multidisciplinary team, collaborating with architects, UX designers, business analysts, quality engineers and platform specialists to deliver scalable, accessible and maintainable digital services.

Key Responsibilities

• Design and develop responsive, accessible and high-performing web applications using React and TypeScript.
• Build reusable UI components, design patterns and shared front-end libraries.
• Integrate front-end applications with REST APIs and enterprise back-end services.
• Work with UX and design teams to deliver intuitive user experiences aligned with enterprise design systems.
• Implement appropriate approaches to state management, routing, authentication and application security.
• Contribute to solution design, technical architecture reviews, estimation and delivery planning.
• Collaborate with Pega delivery teams to configure, extend or integrate Constellation-based user experiences where required.
• Ensure solutions meet agreed standards for performance, accessibility, scalability, maintainability and security.
• Support CI/CD pipelines, automated testing and DevOps practices.
• Mentor less experienced developers and help establish engineering standards and reusable practices.

Required Skills and Experience

• At least five years of commercial experience developing modern web applications.
• Strong practical expertise in React and TypeScript.
• Excellent knowledge of JavaScript, including modern ES6+ features and patterns.
• Experience with HTML5, CSS3, SASS and responsive user interface design.
• Experience consuming RESTful APIs and JSON-based services.
• Familiarity with contemporary front-end tooling such as Vite, Webpack, npm and Git.
• Experience with automated testing frameworks such as Jest, React Testing Library, Cypress or equivalent.
• Sound understanding of secure software development and common front-end security risks.
• Experience working in Agile or Scrum delivery environments.
• Strong communication, collaboration and problem-solving skills.

Desirable

• Experience with Pega Platform, Pega Constellation, Pega DX API or Pega Customer Service.
• Experience extending model-driven or API-driven user experiences while preserving platform standards and upgradeability.
• Experience building component libraries or contributing to enterprise design systems.
• Knowledge of Azure, AWS or other cloud-native architectures.
• Experience with GraphQL, micro-frontends or composable front-end architectures.
• Understanding of low-code platforms, case management, CRM or workflow solutions.
• Experience delivering services in regulated sectors such as government, healthcare, financial services, insurance or transport.
• Practical knowledge of WCAG 2.1 AA accessibility requirements.
• Indicative Technical Stack
• React, TypeScript and JavaScript
• HTML5, CSS3 and SASS
• REST APIs and JSON services
• Git and modern package/build tooling
• Jest, React Testing Library and/or Cypress
• Azure DevOps and/or GitHub
• CI/CD pipelines and automated quality controls
• Pega Constellation and Pega DX APIs (desirable)

Thank you for your interest in this role. Please also share your CV at Shyam@lsarecruit.co.uk and if suitable, we will get in touch with you to discuss further.

Get in touch with Rachel, our AI agent, today at +44 204 620 2747