Front End Developer - Manager

Role purpose

You'll build the user interfaces for a multi-year programme modernizing a large portfolio of middle-office applications and moving them to AWS. This is a hands-on senior development role . You'll build data-heavy, real-time ReactJS/TypeScript applications that replace legacy desktop and web UIs. You'll own front-end integration with back-end services over REST APIs, WebSockets and Server-Sent Events (SSE) . You'll also set front-end standards and tooling for the team, and use AI coding tools as part of your everyday work.

Key responsibilities

Front-end development

• •Design and build complex ReactJS/TypeScript applications for trade processing, reconciliation, settlement and operations monitoring users.
• •Build high-performance, data-heavy UIs: 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.
• •You will have decent experience of understanding and changing Java backend code

Real-time and API integration

• •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. Handle 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: batched rendering, memoisation and throttling.

Build tooling and quality

• •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: SSO/MFA integration, token handling, XSS/CSRF protection and dependency vulnerability scanning.

AI-assisted development

• •Use GitHub Copilot, Claude Code and/or Devin to speed up component building, refactoring, test generation and legacy UI analysis.
• •Review all AI-generated code for correctness, accessibility, performance and security before merging.

Leadership

• •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.

Required experience and skills

• •8+ years in software development, with 5+ years building production ReactJS applications.
• •ReactJS: expert in hooks, context, component design, performance tuning and state management.
• •TypeScript/JavaScript: strong in TypeScript (generics, typing API contracts) and modern JavaScript, including async patterns.
• •Build tooling: practical experience with npm, pnpm and Vite (including migrating from Webpack or similar).
• •WebSockets: strong experience building and supporting production WebSocket integrations, including reconnection and state recovery.
• •SSE: practical experience using Server-Sent Events/EventSource for streaming updates.
• •REST APIs: strong experience consuming and designing contracts with server-side services (OpenAPI/Swagger).
• •Decent Java knowledge
• •Testing: 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.

Preferred

• •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).

Success measures (first 12 months)

• •Delivered production front ends for modernized applications, on schedule.
• •Real-time features are stable under production load, with reliable reconnection and no data loss for users.
• •Shared component library and front-end standards adopted across the team.
• •Faster, smaller builds and good test coverage, measured against a baseline.
• •Measurable productivity gains from AI tools, with no drop in quality.

About State Street

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