Senior Front-End Engineer

Job Mail • Bachelor's Degree • JavaScript • TypeScript • 4 days ago

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Salary

≈ $28k – $60k per year (Estimated)

Location

In office (South Africa)

Seniority

Senior · 3+ years exp

Employment

Full-Time

Confirmed on the employer's own hiring board on Oct 20, 2026. First seen by Alion on Oct 4, 2026. Job Mail scores C on the Alion truth index.

Overview

Company

Impact

Profile match

Job Mail

Job Mail is a South African online job board offering a large selection of vacancies across the country and some positions abroad. Job seekers can search and apply for jobs online, upload a CV and receive job alerts, while employers and recruitment agencies can advertise positions to a broad national audience. The brand is one of the longer-established names in South African job advertising and is operated from South Africa.

jobmail.co.za • HQ: Pretoria, South Africa • Job Boards & Aggregators • Est. 1997

To qualify for this position, you need:

Bachelor's Degree (BSc) in Computer Science, Software Engineering, Information Technology or a related field.
Minimum 3-5 years experience and must have react and typescript

Duties and responsibilities include, but not limited to:

Design, build and maintain production-grade web applications using React and TypeScript.
Translate product requirements, workflows and visual designs into responsive, accessible and polished user experiences.
Own frontend architecture for major features, including component boundaries, state management, data flow, routing, permissions and error handling.
Build reusable components and contribute to a consistent shared component library / design system rather than duplicating UI patterns.
Integrate frontend applications with REST and event-driven APIs, handling loading, retries, errors, pagination, optimistic updates and partial failure cleanly.
Write maintainable HTML and modern CSS, with strong understanding of responsive layout, Flexbox, Grid, browser behaviour, theming and design tokens.
Ensure frontend functionality works consistently across supported browsers, screen sizes and device classes.
Implement appropriate automated tests and participate in release validation, regression testing and defect prevention.
Identify and resolve performance issues including unnecessary renders, large bundles, slow network interactions and inefficient data-fetching patterns.
Build secure interfaces that respect authentication, authorisation, session management and least-privilege principles.
Work closely with Product, Design, Backend, Data and AI engineers to deliver complete end-to-end features.
Review pull requests, improve coding standards and provide practical technical guidance to other frontend engineers.
Contribute to estimation, sprint planning, technical design, documentation and continuous improvement of the engineering process.
Take responsibility for production quality: monitor issues, investigate root causes and improve the product rather than applying repeated short-term fixes.

React & TypeScript

Strong professional experience with React and modern functional component patterns.
Advanced TypeScript: interfaces/types, generics, discriminated unions, narrowing, utility types and type-safe API contracts.
Hooks, context, composition patterns, controlled/uncontrolled components and reusable component APIs.
Understanding of rendering behaviour, memoisation, lifecycle effects, state ownership and avoiding unnecessary re-renders.

HTML & CSS

Semantic HTML5 and a strong understanding of browser layout and rendering.
Modern CSS including Flexbox, Grid, responsive design, media/container queries, CSS variables and maintainable styling conventions.
Ability to reproduce high-fidelity product designs while preserving responsiveness and accessibility.
Comfort with CSS Modules, styled solutions or utility frameworks where appropriate, without depending on a framework to understand CSS.

State, Data & Application Architecture

Strong judgement on local state versus shared/application state.
Experience with server-state/data-fetching patterns such as TanStack Query / React Query or equivalent.
Experience with a suitable client state approach such as Zustand, Redux Toolkit, Context or equivalent when genuinely required.
Clean API integration, schema validation, typed contracts, caching, invalidation, pagination and asynchronous error handling.

Testing & Quality

Unit and component testing using tools such as Vitest/Jest and React Testing Library.
End-to-end testing with Playwright, Cypress or equivalent for critical user journeys.
Ability to design code for testability rather than adding tests as an afterthought.
Strong debugging skills using browser developer tools, network inspection, performance profiling and source maps.

If you do not receive feedback within two weeks of submitting your application, please consider your application unsuccessful.

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