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Jonathan Tri Christianto

@jonathantric

Senior React Native developer specializing in large-scale performance, TypeScript migrations, and cross-platform delivery.

Indonesia

Message

What I'm looking for

I’m looking for remote/global teams where I can own React Native performance and architecture, lead TypeScript migrations, and deliver stable cross-platform features for high-traffic products—backed by strong PM/QA collaboration.

I’m a Senior React Native Developer with 4 years building high-traffic production apps (booking, payments, education platforms) used by thousands of users. I focus on performance optimization, legacy JavaScript to TypeScript migrations, and complex business flows that keep transactions stable and user journeys reliable.

In my current role at bookingtogo, I owned performance improvements—reducing Home Screen load time from 30s to 5s and Flight Search from 60s to 10s—and rebuilt a large React Native app from legacy JS/Class components to TypeScript + Functional Components. I also lead end-to-end React Native delivery at Kelas Pintar, including migration, mentoring, advanced LMS features (complex MCQ/item analysis, bulk upload), in-app purchases, and internationalization (ID/EN/ZH).

Experience

Work history, roles, and key accomplishments

Current

Mobile Apps Developer

Current

PT Indo Teknologi Cemerlang

Jul 2024 - Present (1 year 9 months)

- Owned performance optimization for a large-scale booking app, reducing Home Screen load time from 30s to 5s and Flight Search from 60s to 10s.
- Rebuilt the app from legacy JS/class components to TypeScript + functional components
- Implemented multi-language i18n to support international expansion.

React Native TypeScript Performance Optimization Migration (Legacy JS To TS)State Management REST APIs Background State Debugging

SPV Mobile Developer

PT Extramarks Education Indonesia

Aug 2023 - Jul 2024 (11 months)

Led and mentored a mobile team while owning React Native feature delivery across iOS and Android. Directed an end-to-end migration to React Native, built advanced LMS exam features (MCQ, item analysis, bulk upload), and implemented in-app purchases for subscriptions and virtual currency.

React Native Team Leadership In App Purchases IOS And Android Code Quality Kurikulum Merdeka Delivery

Mobile Application Developer

PT Extramarks Education Indonesia

Mar 2022 - Aug 2023 (1 year 5 months)

Developed and maintained B2B/B2C education mobile applications across iOS and Android within a cross-functional product team. Shipped cross-platform features using Flutter and native iOS (Swift), built question banks with student analytics, and developed native Android modules for offline ebook/PDF downloads.

React Native Flutter Swift Android Development LMS Feature Engineering Question Banks