Frontend Engineering

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

Job Overview

FIT HUB is a venture‑backed technology‑driven health and wellness startup based in Jakarta, Indonesia. Founded in 2020, our mission is to democratize access to Health and Wellness for all Indonesians. We believe that everyone should have access to improving their health and wellness, so we’ve built FIT HUB from the ground up to make exercising friendly, affordable, and fun for new gym‑goers and fitness‑enthusiasts alike. We are looking for a Senior Frontend Engineer to join our Technologies Team. You will play a key role in building reliable, scalable, and user‑centric web applications. Working closely with product, design, and backend teams, you will help shape our frontend architecture, improve application performance, and raise engineering standards across the team.

What You Will Do

• Develop and maintain complex, scalable web applications using React, focusing on reliable and high‑quality user experiences.
• Collaborate with cross‑functional teams, working closely with backend engineers, designers, and product managers to deliver seamless user experiences.
• Improve code quality by maintaining high coding standards through thorough code reviews, automated tests, documentation, and engineering best practices.
• Drive performance optimization using techniques such as lazy loading, code splitting, efficient rendering, and effective state management.
• Explore and adopt relevant frontend technologies and development tools—including AI‑assisted tools—responsibly when they improve product quality, team productivity, or engineering practices.

Requirements

• At least 4 years of experience in frontend or web application development.
• Proven experience with React.js, including functional components, Hooks, Context API, and state‑management approaches such as Redux or similar libraries.
• Strong command of modern ES6+ JavaScript and TypeScript.
• Deep knowledge of CSS3, Flexbox, Grid, responsive design, animations, and preprocessors such as Sass or Less. Experience with Tailwind CSS or styled‑components, Emotion, or similar styling solutions is a plus.
• Hands‑on experience with modern frontend tooling and frameworks such as Next.js, Webpack, Babel, Vite, or similar.
• Strong ability to integrate and work with RESTful APIs. Experience implementing code splitting, lazy loading, rendering optimizations, and improving Lighthouse scores.
• Knowledge of CI/CD tools such as GitHub Actions, CircleCI, Jenkins, or similar.
• Demonstrate curiosity and willingness to learn evolving frontend practices and adopt relevant technologies—including AI‑assisted development tools—while maintaining code quality, security, reliability, and ownership of the final output.