Senior Frontend Engineer: Build Fast, Scalable UIs

FIT HUB; Jakarta Selatan; On-site; IDR 300,000,000 - 600,000,000; Full time

Job summary

FIT HUB, a technology-driven health and wellness startup based in Jakarta, seeks a Senior Frontend Engineer to build reliable, scalable web applications. You will work with product, design, and backend teams to shape frontend architecture and improve performance.

You will contribute to code quality, implement best practices, and continuously learn evolving frontend technologies including AI-assisted tools to deliver high-quality user experiences.

Qualifications

• At least 4 years of frontend or web application development experience.
• Proven React.js experience with 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, animations; experience with Tailwind CSS or styled-components is a plus.
• Hands-on experience with modern frontend tooling and frameworks (Next.js, Webpack, Babel, Vite).
• Strong ability to integrate RESTful APIs and optimize performance including code splitting and lazy loading.
• Familiar with CI/CD tools (GitHub Actions, CircleCI, Jenkins) and a mindset for continuous learning and responsible AI adoption.

Responsibilities

• Develop and maintain complex, scalable frontend web applications using React with a focus on reliable user experiences.
• Collaborate with backend engineers, designers, and product managers to deliver seamless interfaces.
• Maintain high coding standards through code reviews, tests, and documentation.
• Drive performance optimization through lazy loading, code splitting, and efficient rendering.
• Evaluate and adopt frontend technologies and tools when they improve product quality or productivity.

Skills

Frontend development

React.js

JavaScript/TypeScript

CSS/SASS/Tailwind

Frontend performance

CI/CD

AI-assisted development

Code quality & testing

Education

Tools

Next.js

Webpack

Babel

Vite

GitHub Actions

Job description

FIT HUB, a technology-driven health and wellness startup based in Jakarta, seeks a Senior Frontend Engineer to build reliable, scalable web applications. You will work with product, design, and backend teams to shape frontend architecture and improve performance.

You will contribute to code quality, implement best practices, and continuously learn evolving frontend technologies including AI-assisted tools to deliver high-quality user experiences.