Frontend Architect - React AI

HCLTech; City Of London; On-site; GBP 65,000 - 90,000; Full time

Job summary

HCLTech is seeking a skilled UI Developer to build time-critical, high-availability, and high-performance user interfaces. You will work across the full UI development lifecycle, from design through testing and deployment, using HTML, CSS, JavaScript, React and TypeScript.

Strong experience with real-time communication (WebSockets, SSE) and REST APIs, plus state management (Redux) and SPA architectures, is essential.

Qualifications

• Experience in UI development lifecycle including design, development, testing and deployment.
• Frontend technologies: HTML, CSS, JavaScript, React and TypeScript.
• Real-time communication: WebSockets, SSE and REST APIs.
• State management with Redux and reactive programming concepts.
• Architecture: micro-frontends and Single Page Applications (SPA).
• Testing with React Testing Library and Jest.
• UI Automation with Playwright or Cypress.
• Experience with financial services or trading platforms is a plus.
• Strong focus on performance optimization and low-latency UI applications.
• Experience in highly available, mission-critical systems.

Responsibilities

• Build time-critical, high-availability, and high-performance UI applications.
• Own the full UI development lifecycle from design to deployment.
• Collaborate with backend teams to integrate APIs and real-time data streams.

Skills

Frontend development

UI performance optimization

Real-time UI

SPA architecture

Testing mindset

Tools

React

TypeScript

HTML

CSS

Redux

Playwright

Cypress

Jest

Testing Library

WebSockets

SSE

REST APIs

Job description

HCLTech is a global technology company, home to 219,000+ people across 54 countries, delivering industry-leading capabilities centered on digital, engineering and cloud, powered by a broad portfolio of technology services and products. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Consolidated revenues as of $13+ billion.

For more information on how we process your personal data, please refer to HCLTech’ s Candidate Data Privacy Notice.

Job Description: UI Developer (React, TypeScript and AI)

Role Overview-

We are seeking a highly skilled UI Developer with strong expertise in building time-critical, high-availability, and high-performance applications. The ideal candidate will have hands-on experience across the full UI development lifecycle, including design, development, testing, and deployment.

Technical Skills & Expertise-

• Frontend Technologies: Expert-level proficiency in HTML, CSS, JavaScript, React, and TypeScript
• Real-Time Communication: Strong understanding of WebSockets, Server-Sent Events (SSE), and REST APIs
• State Management & Programming: Solid experience with state management libraries (e.g., Redux) and reactive programming paradigms
• Architecture: Strong understanding of micro-frontends and Single Page Applications (SPA)
• Testing: Hands-on experience with React Testing Library / Jest for unit and integration testing
• UI Automation (Good to Have): Exposure to frameworks like Playwright or Cypress

Desired Experience

• Experience working on financial services or trading platforms is an advantage
• Strong understanding of performance optimization and low-latency UI applications
• Experience with highly available, mission-critical systems.