Senior Frontend Developer - React JS (React 19)

Responsibilities

Build and maintain scalable, production-grade frontend applications using React 19 and Next.js 15; Write fully typed, maintainable code in TypeScript across all layers of the frontend stack; Define and enforce runtime data validation using Zod for API responses, form inputs and shared data contracts; Develop rich, accessible UI components and layouts using Mantine v9, including theming, responsive design and component customisation; Design and implement custom hooks and state architecture patterns that promote reusability, testability and separation of concerns; Integrate frontend applications with backend REST APIs — handling authentication flows, error states, loading states and data caching; Collaborate with backend engineers to define API contracts and ensure type-safe end-to-end data flows; Participate in code reviews, technical planning and sprint ceremonies; Maintain frontend documentation, component libraries and coding standards

Requirements

React 19 - Strong hands-on experience with React 19 including concurrent features, transitions and the latest hooks patterns; Next.js 15 - Production experience with Next.js 15 — App Router, Server Components, Server Actions, routing and rendering strategies (SSR, SSG, ISR); TypeScript - Advanced TypeScript proficiency — generics, utility types, discriminated unions, strict mode; Zod - Experience using Zod for schema definition, validation and type inference across API boundaries and forms; Mantine v9 - Hands-on experience with Mantine v9 component library — theming, custom components, form integration and responsive layouts; Custom Hook & State Architecture - Proven ability to design clean custom hook patterns, manage complex local and global state, and structure frontend codebases for scale; REST API Integration - Solid experience consuming REST APIs — handling async data fetching, error boundaries, optimistic updates and token-based authentication

Nice to have

Azure - Familiarity with Azure Static Web Apps, Azure CDN, Azure DevOps or Azure AD / Entra ID for frontend hosting and identity; Authentication & Security - Working knowledge of OAuth 2.0, JWT handling, secure token storage, PKCE flows and protecting frontend routes; CI/CD Pipelines - Experience setting up or maintaining frontend CI/CD pipelines using GitHub Actions, Azure DevOps or equivalent — including build, lint, test and deploy stages; Strong understanding of web performance, Core Web Vitals and accessibility (WCAG) fundamentals; Comfortable working in an Agile / Scrum environment with regular releases and evolving requirements; Collaborative team player who engages proactively with designers, backend engineers and product stakeholders; Attention to detail in both code quality and visual output