Senior Frontend Architect — Real-Time React & TypeScript

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 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.