Frontend Engineering

FIT HUB; Jakarta Pusat; On-site; IDR 279,000,000 - 502,200,000; Full time

Job summary

FIT HUB in Jakarta is seeking a Senior Frontend Engineer to build reliable, scalable web applications with a user-centric focus. You will work with product, design, and backend teams to shape frontend architecture, improve performance, and raise engineering standards.

The role requires strong React.js expertise, TypeScript, and modern frontend tooling. You will collaborate across functions, implement efficient state management, and ensure high-quality code through reviews and testing.

Qualifications

• At least 4 years of frontend or web app development experience.
• Proven experience with React.js including functional components, Hooks, Context API, and Redux or similar state management.
• Strong command of modern ES6+ JavaScript and TypeScript.
• Deep knowledge of CSS3, Flexbox, Grid, responsive design, and preprocessors like Sass or Less; Tailwind CSS or styled-components is a plus.
• Experience with frontend tooling (Next.js, Webpack, Babel, Vite) and RESTful APIs.

Responsibilities

• Develop and maintain complex, scalable frontend applications using React to deliver high-quality user experiences.
• Collaborate with backend engineers, designers, and product managers to implement features end-to-end.
• Improve code quality via code reviews, testing, documentation, and engineering best practices.
• Drive frontend performance through lazy loading, code splitting, efficient rendering, and state management.
• Evaluate and adopt frontend technologies and AI-assisted tools when they improve product quality and team productivity.

Skills

React.js

TypeScript

ES6+ JavaScript

CSS3

Tailwind CSS

Next.js

Redux

API Integration

CI/CD

AI-assisted tools

Tools

Next.js

WebPack

Babel

Vite

GitHub Actions

CircleCI

Jenkins

Job description

Responsibilities

About us: FIT HUB is a venture-backed technology driven health and wellness startup based in Jakarta, Indonesia. Founded in 2020, FIT HUB’s 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.

The Opportunity: 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 Frontend Applications: Build and maintain complex, scalable web applications using React, with a focus on reliable and high-quality user experiences.
• Collaborate with Cross-Functional Teams: Work closely with backend engineers, designers, and product managers to deliver seamless user experiences.
• Improve Code Quality: Maintain high coding standards through thorough code reviews, automated tests, documentation, and engineering best practices.
• Drive Performance Optimization: Improve application performance through techniques such as lazy loading, code splitting, efficient rendering, and effective state management.
• Explore and Adopt Relevant Technology: Continuously evaluate relevant frontend technologies and development tools—including AI-assisted tools—and adopt them responsibly when they improve product quality, team productivity, or engineering practices.

Requirements

• Experience: At least 4 years of experience in frontend or web application development.
• React Expertise: Proven experience with React.js, including functional components, Hooks, Context API, and state-management approaches such as Redux or similar libraries.
• JavaScript and TypeScript: Strong command of modern ES6+ JavaScript and TypeScript.
• CSS Mastery: Deep knowledge of CSS3, Flexbox, Grid, responsive design, animations, and preprocessors such as Sass or Less. Experience with Tailwind CSS, styled-components, Emotion, or similar styling solutions is a plus.
• Frontend Tooling: Hands-on experience with modern frontend tooling and frameworks, such as Next.js, Webpack, Babel, Vite, or similar.
• API Integration: Strong ability to integrate and work with RESTful APIs. Performance Optimization: Experience implementing code splitting, lazy loading, rendering optimizations, and improving Lighthouse scores.
• CI/CD Familiarity: Knowledge of CI/CD tools such as GitHub Actions, CircleCI, Jenkins, or similar.
• Continuous Learning and Responsible AI Adoption: 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.