Frontend Architect - React

HCLTech; Slough; On-site; GBP 60,000 - 90,000; Full time

Job summary

HCLTech is seeking a UI Developer skilled in React, TypeScript and low-latency applications to join our team in the UK. You will own the front-end development lifecycle from design to deployment, delivering responsive, high-availability interfaces.

The ideal candidate has strong expertise in HTML/CSS/JavaScript, real-time communication, and modern state management. You will work on mission-critical financial tech projects, ensuring optimal performance and reliability.

Qualifications

• Proven experience building time-critical, high-availability UI applications.
• Expert in HTML, CSS, JavaScript with React and TypeScript.
• Experience with WebSockets, SSE and REST APIs.
• Familiar with Redux or similar state management.
• Experience with testing: React Testing Library and Jest.
• Knowledge of micro-frontends and SPAs.

Responsibilities

• Develop and maintain high-performance UI components.
• Collaborate with backend and QA to ensure low latency.
• Implement real-time UI features and robust testing.
• Participate in code reviews and performance optimizations.

Skills

HTML

CSS

JavaScript

React

TypeScript

WebSockets

SSE

REST APIs

Redux

SPA

Testing Library

Jest

Playwright

Cypress

Tools

Playwright

Cypress

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.

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Job Description: UI Developer (React, TypeScript and Low-Latency)

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.