Senior Front-End React Engineer

Senior Front-End React Engineer (Remote) – South Africa.

A well establish international software development company is looking for a Senior Front-End React Engineer to join their team on full time permanent basis.

This can be a fully remote position or hybrid with the option of going into their office in either Somerset West, Pretoria or Johannesburg only once a week.

Overview

We’re looking for a Senior Frontend Engineer with deep React expertise to join a team. The team owns one of the core revenue-generating products (serving and managing ads across the platform), spanning an end-user-facing frontend and an internal back-office application.

You’ll work in a modern TypeScript / microfrontend environment, collaborate closely with Kotlin backend engineers, and operate in a team that is actively integrating AI/agentic tooling into its everyday engineering workflow.

Requirements

• Senior level – Minimum 5+ years with React and a track record of shipping and maintaining production frontend systems in a modern TypeScript environment.
• Full-stack background is a plus but the centre of gravity is frontend.
• Core tech stack (must-have):
  • TypeScript (primary language) and JavaScript
  • React – 5+ years’ hands-on experience (hard requirement)
  • Astro and/or Next.js
  • Build tooling: Vite / Webpack
  • Styling: Tailwind
  • Testing: Jest / Vitest (unit) and Cypress / Playwright (e2e/integration)
  • Microfrontend architecture, component reuse and testability
  • Git-based workflow with GitHub Actions CI/CD
• Valued / nice-to-have:
  • Full-stack awareness and comfortable collaborating with Kotlin (or other JVM/typed backend) services; understanding of REST and clean integration between frontend and backend.
  • OpenAPI / Swagger – API documentation and, ideally, contract/code generation.
  • Observability & error monitoring: Sentry, Datadog, real-user monitoring (RUM) – understanding that remote logging beats local console.log.
  • Product analytics and experimentation: Google Analytics (event triggers, funnels, retention/drop off analysis) and A/B testing via feature flags and traffic splitting.

Key Responsibilities

• Build and maintain user-facing and internal frontend applications using React, TypeScript, Astro and Next.js within a microfrontend architecture optimised for component reuse and testability.
• Write clean, well-structured, testable code and make sound architectural decisions around component design, separation of concerns, pure functions, dependency injection and state/data flow.
• Make deliberate client-side vs server-side trade-offs – filtering, pagination and payload sizing – with an eye on performance at scale (millions of users/records).