Senior JavaScript Engineer

Senior JavaScript Engineer

Join a product-led team pushing the limits of Next.js innovation

Cape Town-based | R50,000 R70,000 / month | On-site

About Our Client

This fast-growing tech company is building cutting-edge digital products from their Cape Town HQ, with a strong focus on performance, scalability, and user experience. Their cross-functional teams work collaboratively in an agile environment, and they invest heavily in engineering excellence and modern tooling. If you're passionate about modern frontend architecture and love shipping clean, impactful code this is the place to do it.

The Role : Senior JavaScript Engineer

As a Senior JavaScript Engineer, you'll be leading the build of complex web applications using the latest in the Next.js ecosystem. This role is for someone who thrives in a modern JavaScript stack, enjoys mentoring others, and wants to have a real say in shaping the frontend architecture and standards. You'll be instrumental in ensuring scalable design patterns, frontend performance, and best practices across the engineering team.

Key Responsibilities

Minimum 5 years of JavaScript development experience in production environments

Build and scale applications using Next.js (App Router and Pages Router)

Develop reusable components and implement scalable design patterns

Optimise performance using SSR, ISR, SSG, streaming, and server components

Mentor junior and mid-level developers in React and Next.js

Lead technical planning, architecture decisions, and technology evaluations

Ensure high code quality through code reviews and testing best practices

Collaborate closely with product managers and designers

Contribute to internal tools, CI / CD pipelines, and deployment workflows

Stay on the pulse of modern JS and React ecosystem developments

About You

5+ years in JavaScript, with 3+ years in React and 2+ years in Next.js (v13+)

Strong command of rendering strategies : SSR, SSG, ISR, and client-side rendering

Proficient in TypeScript, async patterns, React hooks, context, and state management

Experience with Tailwind CSS, CSS-in-JS, and component libraries

Git-savvy with strong collaborative workflows

Passionate about web performance, Core Web Vitals, and clean architecture

Advantageous : experience with Vercel, testing frameworks (Vitest, Playwright, etc.), SEO, monorepos, NextAuth.js, WebSockets, headless CMS (e.g., Sanity, Contentful)

Proactive, detail-oriented, and always looking to level up the stack and the team