Front End Developer - Manager

Overview

Hands-on senior front-end development role building data-heavy, real-time ReactJS/TypeScript applications that replace legacy desktop and web UIs as part of a multi-year middle-office modernization and AWS migration programme.

What you'll do

• Design and build complex ReactJS/TypeScript applications for trade processing, reconciliation, settlement and operations monitoring users.
• Build high-performance, data-heavy UIs including large grids (e.g. AG Grid), virtualised lists, filtering, dashboards and live status views.
• Design reusable component libraries, state management (e.g. Redux Toolkit, Zustand, React Query) and accessible, consistent UI patterns.
• Write clean, modern JavaScript (ES6+) and strongly typed TypeScript, and keep API contracts type-safe.
• Integrate with server-side services over REST APIs, including authentication, pagination, caching, retries and error handling.
• Build robust WebSocket clients (native WebSocket, STOMP or Socket.IO) for two-way, low-latency updates, handling reconnects, heartbeats, back-pressure, message ordering and subscription management.
• Implement SSE streams for one-way server push (e.g. job status, cycle progress, alerts), including reconnection and event replay.
• Choose the right pattern (REST, WebSocket or SSE) for each use case, working with back-end engineers on message design and contracts.
• Make real-time screens perform well under heavy update volumes using batched rendering, memoisation and throttling.
• Set up and maintain front-end builds with npm/pnpm and Vite, including workspaces/monorepos, dependency management, environment configuration and bundle optimisation.
• Work with DevOps on CI/CD pipelines (Harness/GitHub Actions) for front-end build, test and deployment.
• Write unit, component and end-to-end tests (Vitest/Jest, React Testing Library, Playwright or Cypress), and use mock servers for REST, WebSocket and SSE testing.
• Handle front-end security including SSO/MFA integration, token handling, XSS/CSRF protection and dependency vulnerability scanning.
• Use GitHub Copilot, Claude Code and/or Devin to speed up component building, refactoring, test generation and legacy UI analysis, and review all AI-generated code for correctness, accessibility, performance and security before merging.
• Set front-end standards, review code and mentor other developers.
• Work with business analysts and users to turn legacy screens and workflows into modern, usable interfaces.
• Support releases, cutovers and early-life support.

What you'll need

• 8+ years in software development, with 5+ years building production ReactJS applications.
• ReactJS: expert in hooks, context, component design, performance tuning and state management.
• Strong TypeScript (generics, typing API contracts) and modern JavaScript, including async patterns.
• Practical experience with npm, pnpm and Vite (including migrating from Webpack or similar).
• Strong experience building and supporting production WebSocket integrations, including reconnection and state recovery.
• Practical experience using Server-Sent Events/EventSource for streaming updates.
• Strong experience consuming and designing contracts with server-side services (OpenAPI/Swagger).
• Decent Java knowledge, including experience understanding and changing Java backend code.
• Testing with Jest/Vitest, React Testing Library and an end-to-end framework.
• Git, CI/CD and agile delivery.
• Regular use of AI coding assistants in professional delivery.

Nice to have

• Working knowledge of Java/Spring Boot back ends (e.g. Spring WebSocket/STOMP, SSE endpoints), to work well with back-end teams.
• Experience with Kafka-backed real-time UIs or streaming gateways.
• Experience replacing legacy UIs (GWT, PowerBuilder, desktop/Citrix applications).
• Experience in financial services, ideally trading, settlement or operations monitoring.
• Familiarity with AWS front-end hosting (S3/CloudFront, API Gateway WebSockets).

Details

• Location: Bangalore, India.