Senior Frontend Engineer — React, Performance & UX

FIT HUB; Jakarta Pusat; On-site; IDR 240,000,000 - 360,000,000; Full time

Job summary

FIT HUB is a Jakarta-based health and wellness startup seeking a Senior Frontend Engineer to join our Technologies Team. You will help shape frontend architecture, improve performance, and build reliable, user-centric web applications in collaboration with product, design, and backend teams.

You will work with React.js, TypeScript, and modern tooling to deliver scalable experiences for gym-goers and wellness enthusiasts.

Qualifications

• At least 4 years in frontend/web development.
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Responsibilities

• Develop and maintain scalable web apps using React.
• Collaborate with backend, design, and product teams to deliver seamless UX.
• Improve code quality via reviews, tests, and documentation.
• Drive performance with lazy loading, code splitting, and efficient rendering.
• Explore frontend technologies and AI-assisted tools to enhance product quality.

Skills

React.js

Hooks

Context API

Redux

JavaScript (ES6+)

TypeScript

CSS3

Flexbox

Grid

Responsive design

Sass/Less

Tailwind CSS

Styled-components/Emotion

Next.js

Webpack

Babel

Vite

RESTful APIs

Code splitting

Lazy loading

Lighthouse optimization

GitHub Actions

CircleCI

Jenkins

AI-assisted tools

Curiosity to learn

Tools

Next.js

Webpack

Babel

Vite

Job description

FIT HUB is a Jakarta-based health and wellness startup seeking a Senior Frontend Engineer to join our Technologies Team. You will help shape frontend architecture, improve performance, and build reliable, user-centric web applications in collaboration with product, design, and backend teams.

You will work with React.js, TypeScript, and modern tooling to deliver scalable experiences for gym-goers and wellness enthusiasts.