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Rhony Abdullah Siagian

@rhonyabdullah

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Android engineer. 9+ YoE. Kotlin. KMP, AppSec (MobSf, OWASP). Remote or hybrid. 8 Years Passport.

Indonesia

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What I'm looking for

I’m seeking a remote or hybrid role as an Android Engineer, from mid-level up to Staff. I enjoy working on secure, scalable apps using Jetpack Compose and Kotlin. I value clean architecture, mobile security and cross-team collaboration. Open to long-term roles where I can contribute to both product and technical growth.

I am Android Engineer with over 9 years of experience in Kotlin (8 years), Jetpack Compose (2 years), mobile app security (4 years) and performance optimization. I’ve built and scaled Android applications across various industries including fintech, health tech, e-commerce, and geolocation. My technical strengths lie in native Android development using MVVM architecture, Compose Multiplatform, and applying OWASP MAS standards for app hardening and security testing using tools like Frida, MobSF, Objection and MITM proxy.

In recent years, I’ve contributed to high-traffic apps such as Geolancer (Quadrant.io), SehatQ, and myToyota Wallet (OPN/Omise), where I led key efforts in app performance, security implementation, SDK development and test automation. I’ve also taken on advisory and leadership roles, notably helping Rey.id migrate from React Native to native Android while integrating VIDA for secure KYC.

I’m passionate about secure mobile development, automation, and cross-platform innovations with Compose Multiplatform. Outside of work, I continuously upskill through hands-on learning in Swift, AI tools like Ollama using qwen3 and gemma3. I’m based in Indonesia, open to remote (with occasional visit) or hybrid opportunities and excited to collaborate with companies solving meaningful problems through technology.

Experience

Work history, roles, and key accomplishments

Current

Mobile Developer

Current

Rey.id

Apr 2025 - Present (3 months)

Re-engaged to support the app's long-term stability and feature enhancements, following a successful migration from Hybrid to Native Android. Responsibilities include maintaining and upgrading project dependencies, initiating Jetpack Compose integration, and addressing security vulnerabilities.

Kotlin Jetpack Compose C++Cross Platform Coordination

Android Engineer

Omise (OPN)

Apr 2024 - Apr 2025 (1 year)

Developed and optimized the InstaPay feature for a high-traffic B2C fintech app, including QR image generation and secure PIN verification. Improved test code coverage from 20% to 50% and contributed to app security evaluation using mobile app penetration testing tools like Frida.

Kotlin Fintech Mobile Security Penetration Testing Frida Test Automation Appium Robot Framework

Android Advisory

Rey.id

Mar 2023 - Dec 2023 (9 months)

Led the migration of an existing hybrid app (React Native) to a native Kotlin Android application, addressing critical performance issues. Constructed the foundational Android architecture, built the Android team through recruitment, and integrated VIDA.id for KYC verification.

Kotlin React Native Native Android Migration Android Application Architecture Recruitment KYC Team Leadership

Senior Android Engineer

Quadrant.io

Aug 2022 - Feb 2024 (1 year 6 months)

Achieved 80% app performance improvement by resolving memory leaks and 95% fraud reduction through custom cryptography (AES-128 with AWS Data Key). Migrated Android architecture to MVVM with Kotlin and Coroutines, and integrated OpenCV/TensorFlow Lite for image detection.

Kotlin Java MVVM Coroutines AES 128 AWS Data Key OpenCV Tensorflow Lite Fraud Detection Recruitment

Senior Android Engineer

SehatQ

Jun 2021 - Aug 2023 (2 years 2 months)

Led the core Android engineering team, optimizing telemedicine and e-commerce features for a high-traffic healthcare app. Implemented significant improvements in app security, performance, and architectural design, including unit testing, dependency injection, and atomic design.

Kotlin MVVM Unit Testing Dependency Injection Performance Optimization Recruitment

Lead Android Engineer

Umma

Jan 2021 - Jun 2021 (5 months)

Developed a podcast feature utilizing ExoPlayer and integrated deeplinks to support marketing campaigns. Contributed to recruitment processes and provided analytics events for data-driven decision-making. Rearchitected the Android project to a modular design, enhancing testability.

Kotlin Java MVVM ExoPlayer Analytics Recruitment Software Rot Prevention

Android Engineer

Koala Pro

Feb 2019 - Feb 2019 (0 months)

Developed key features including the rent history page and room renting details page for a boarding house reporting app. Collaborated effectively with the full-time engineering team to deliver specific functionalities within a short timeframe.

Android Development UI Development Collaboration

Android Engineer (Acting Lead)

Matahari

Dec 2018 - Dec 2020 (2 years)

Built the Matahari Android app from scratch, successfully releasing it to Google Play. Migrated the application's architecture to a modular design and implemented Google Analytics combined with Tag Manager to facilitate data-driven stakeholder decisions.

Kotlin Java MVVM Google Analytics Google Tag Manager App Release Recruitment Technical Documentation

Android Engineer

MatahariMall

Aug 2017 - Dec 2018 (1 year 4 months)

Proposed and successfully improved mobile app security communications to mitigate fraudulent activity. Integrated payment solutions using a combination of native and JavaScript interfaces for verification. Contributed to recruitment and transitioned codebases from Java to Kotlin.

Kotlin Java MVVM Payment Integration Google Analytics Google Tag Manager Recruitment Code Migration Mo Engage

Android Engineer

Alfacart

Apr 2016 - Aug 2017 (1 year 4 months)

Built the initial Alfacart Android app from scratch and successfully launched it to production. Implemented the MVP design pattern post-release and integrated Google Analytics and Firebase platforms. Refactored classes to support Dagger dependency injection and managed offline behavior with Realm database.