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I am an experienced Senior Mobile Developer with over 8 years in mobile application development, specializing in React Native/Expo for more than 4 years and native iOS development using Swift and Objective-C. I have led the development of a major food delivery application that surpassed 200,000 downloads in Singapore and contributed significantly to high-profile Singapore-based mobile apps such as iChangi 2.0, SMRT Connect, and Sweet Changi Airport. I enjoy mentoring engineers, optimizing app performance, and implementing secure, scalable solutions across mobile platforms. My career highlights include rebuilding a large food delivery app from the ground up, architecting cross-platform apps with high code reuse and stability, applying advanced testing methodologies, and integrating enterprise-grade security standards including OWASP Mobile Top 10 safeguards. I am passionate about crafting seamless user experiences and leading teams to deliver robust mobile applications used by thousands daily.…I am an experienced Senior Mobile Developer with over 8 years in mobile application development, specializing in React Native/Expo for more than 4 years and native iOS development using Swift and Objective-C. I have led the development of a major food delivery application that surpassed 200,000 downloads in Singapore and contributed significantly to high-profile Singapore-based mobile apps such as iChangi 2.0, SMRT Connect, and Sweet Changi Airport. I enjoy mentoring engineers, optimizing app performance, and implementing secure, scalable solutions across mobile platforms. My career highlights include rebuilding a large food delivery app from the ground up, architecting cross-platform apps with high code reuse and stability, applying advanced testing methodologies, and integrating enterprise-grade security standards including OWASP Mobile Top 10 safeguards. I am passionate about crafting seamless user experiences and leading teams to deliver robust mobile applications used by thousands daily.

La Win Ko

App Developer, Programmer, Developer, +1

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I am an experienced Senior Mobile Developer with over 8 years in mobile application development, specializing in React Native/Expo for more than 4 years and native iOS development using Swift and Objective-C. I have led the development of a major food delivery application that surpassed 200,000 downloads in Singapore and contributed significantly to high-profile Singapore-based mobile apps such as iChangi 2.0, SMRT Connect, and Sweet Changi Airport. I enjoy mentoring engineers, optimizing app performance, and implementing secure, scalable solutions across mobile platforms. My career highlights include rebuilding a large food delivery app from the ground up, architecting cross-platform apps with high code reuse and stability, applying advanced testing methodologies, and integrating enterprise-grade security standards including OWASP Mobile Top 10 safeguards. I am passionate about crafting seamless user experiences and leading teams to deliver robust mobile applications used by thousands daily.…I am an experienced Senior Mobile Developer with over 8 years in mobile application development, specializing in React Native/Expo for more than 4 years and native iOS development using Swift and Objective-C. I have led the development of a major food delivery application that surpassed 200,000 downloads in Singapore and contributed significantly to high-profile Singapore-based mobile apps such as iChangi 2.0, SMRT Connect, and Sweet Changi Airport. I enjoy mentoring engineers, optimizing app performance, and implementing secure, scalable solutions across mobile platforms. My career highlights include rebuilding a large food delivery app from the ground up, architecting cross-platform apps with high code reuse and stability, applying advanced testing methodologies, and integrating enterprise-grade security standards including OWASP Mobile Top 10 safeguards. I am passionate about crafting seamless user experiences and leading teams to deliver robust mobile applications used by thousands daily.

Available to hire

I am an experienced Senior Mobile Developer with over 8 years in mobile application development, specializing in React Native/Expo for more than 4 years and native iOS development using Swift and Objective-C. I have led the development of a major food delivery application that surpassed 200,000 downloads in Singapore and contributed significantly to high-profile Singapore-based mobile apps such as iChangi 2.0, SMRT Connect, and Sweet Changi Airport. I enjoy mentoring engineers, optimizing app performance, and implementing secure, scalable solutions across mobile platforms.

My career highlights include rebuilding a large food delivery app from the ground up, architecting cross-platform apps with high code reuse and stability, applying advanced testing methodologies, and integrating enterprise-grade security standards including OWASP Mobile Top 10 safeguards. I am passionate about crafting seamless user experiences and leading teams to deliver robust mobile applications used by thousands daily.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Work Experience

Senior Mobile Developer at WeesWares Pte Ltd

April 1, 2021 - Present

Led the rebuild of a major food-delivery app in React Native within 4 months, achieving seamless iOS and Android launch with over 200,000 downloads. Architected cross-platform apps such as Zig Rent and Mandai Wildlife Group with 90% code sharing and zero critical crashes. Enhanced app performance reducing CPU usage by 30–40%, integrated native modules for DBS PayLah! and Zendesk SDK, and maintained robust CI/CD pipelines using App Center, GitHub Actions, and Fastlane. Mentored a team of three engineers, introduced Redux architecture, and enforced rigorous code reviews leading to a 10% reduction in bug regressions. Utilized testing libraries including Jest, Detox and React Native Testing Library to improve app reliability.

Senior iOS Developer at WeesWares Pte Ltd

February 1, 2019 - Present

Maintained and developed native iOS apps for Singaporean clients like Sweet Changi Airport, Changi Survey, SMRT Connect, Jewel Changi, and Cab Changi. Implemented biometric login, Background Fetch, and Realm offline caching, improving session retention by 15%. Applied OWASP Mobile Top 10 security safeguards including certificate pinning and biometric authentication ensuring zero security incidents. Upgraded legacy networking libraries, rewrote RealmDB layers for stability, integrated VisioMove SDK for indoor navigation, and incorporated Unity games into native iOS apps.

iOS and Android Developer at Mounts Pte Ltd

February 28, 2019 - August 6, 2025

Led the end-to-end development of the MyanCare Doctors telemedicine platform enabling secure HD audio and video consultations using WebRTC and ConnectyCube. Developed real-time chat support via Socket.io for doctor–patient messaging and follow-up care. Integrated Firebase Cloud Messaging and iOS CallKit for VoIP push notifications, increasing call connection success rates by 30%.