Sr. React Engineer - US

Role Overview

The Sr. React Engineer is a front-end specialist responsible for designing and building modern, responsive, accessible web experiences for mSupply’s applications. The role leads React/Next.js/TypeScript front-end architecture, sets UI engineering standards, and mentors other engineers.

Responsibilities

• Design and develop front-end features using React, Next.js, TypeScript, and modern JavaScript tooling
• Architect and evolve Next.js applications using the App Router, server components, server actions, route handlers, middleware, and rendering strategies (ISR/SSR/SSG)
• Consume ASP.NET Web APIs and integrate with Azure-hosted services
• Build responsive, performant, and accessible UIs meeting WCAG 2.1 AA
• Collaborate with UX designers to convert wireframes/prototypes and design tokens into production components
• Define and enforce front-end coding standards, testing strategies, and performance budgets (Core Web Vitals, bundle size, caching)
• Implement and maintain client/server state management, routing, authentication (e.g., MSAL / Entra ID), and API integration patterns
• Lead code reviews, mentor engineers, and coach on modern React/Next.js best practices
• Partner with Solution Architects to align with system architecture and security standards
• Contribute to CI/CD pipelines in Azure DevOps for building, testing, and deploying to Azure (App Service, Static Web Apps, or containers)
• Investigate and resolve complex UI bugs, performance issues, and accessibility findings
• Stay current on the React/Next.js ecosystem and advocate for adoption when beneficial

Requirements

• Bachelor’s degree in CS/Software Engineering or equivalent experience
• 5+ years professional front-end engineering, including 3+ years focused on React
• 2+ years hands-on production experience with Next.js (App Router preferred)
• Expert proficiency with React, TypeScript, HTML5, CSS3, and modern JavaScript (ES2020+)
• Deep knowledge of React patterns (hooks, context, suspense, server components) and performance optimization
• Strong understanding of Next.js rendering strategies (SSR/SSG/ISR/RSC), caching, routing, data fetching, and middleware
• Hands-on experience with state/data-fetching tools (e.g., React Query (TanStack Query), Redux Toolkit, Zustand, SWR, etc.)
• Experience with shared component libraries and design systems (e.g., Tailwind CSS, shadcn/ui, MUI, etc.)
• Experience consuming RESTful ASP.NET/C# APIs deployed to Microsoft Azure
• Working knowledge of Azure authentication patterns (text truncates in posting)

Nice-to-haves

• None explicitly stated beyond the detailed technology and platform requirements