Open to opportunities

Gilang Irfansyah

@gilangirfansyah

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Experienced Front-End Developer specializing in React and TypeScript for scalable, user-centric applications.

Indonesia

Message

What I'm looking for

I seek a role building scalable, user-centric frontend systems with strong collaboration, mentorship opportunities, and emphasis on performance, testing, and growth.

I am an experienced Front-End Developer with over five years building scalable, responsive applications using React and TypeScript. I focus on performance, accessibility, and maintainable component-driven architectures that serve enterprise needs.

At Siloam Hospital Group I led a replatforming project and built a custom DMS frontend that handled 10,000+ monthly documents and improved finance processing times dramatically. I also designed a multi-threaded PDF rendering system and created a shared React UI component library adopted by 15+ teams.

I have improved product metrics across multiple companies — increasing conversion rates, reducing page load times, and cutting defect rates through testing and BDD practices. I mentor teams on modern frontend patterns, testing with Jest and Playwright, and efficient state management with Redux and Zustand.

I seek to deliver high-quality, user-focused interfaces while collaborating closely with backend and product teams. I bring a pragmatic, results-oriented approach to building reliable, maintainable web applications.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer

Current

Siloam Hospital Group

Nov 2023 - Present (2 years 7 months)

Engineered migration from IBM FileNet to a custom DMS and built a React frontend handling 10,000+ monthly documents across 66 facilities, cutting finance processing from 3 days to 4 hours and speeding data entry by 50%.

React TypeScript Redux PDF Rendering Jest Playwright RESTful APIs

Freelance Frontend Developer

Astra Credit Company

Nov 2023 - Nov 2024 (1 year)

Enhanced a digital lending platform with React and TypeScript, built modular component libraries and integrated contact-center analytics, improving team efficiency by 35% and Lighthouse score from 65 to 92.

React TypeScript Component Libraries Performance Optimization ECentrix RESTful APIs Lighthouse

Frontend Developer

Beever Indonesia

Sep 2022 - Oct 2023 (1 year 1 month)

Maintained a Hospital Management System frontend using React and Redux, reduced initial load time by 40% and integrated real-time dashboards that increased operational efficiency by 25%.

React Redux RESTful APIs Performance Tuning Component Design Agile Lazy Loading State Management

Frontend Developer

Indoesports

Dec 2021 - Sep 2022 (9 months)

Designed and developed 15+ React landing pages for esports events driving 50,000+ registrations and a 35% conversion lift; created a shared component library and improved organic traffic by 60%.

React SEO Component Libraries Responsive Design A B Testing

Frontend Engineering Intern

Transfree

Sep 2019 - Feb 2020 (5 months)

Built a responsive React web app with interactive animations, increasing session duration by 50% and performed QA that identified 20+ critical UX issues prior to Android launches.

React Responsive Design QA Testing Agile Animation User Experience