I lead a mobile team at an Indonesian finance company, and I write about the architecture decisions I have had to live with afterwards.

Lead a team of 9 mobile and frontend engineers, and own architecture decisions: analysing requirements with product and business stakeholders, then turning them into technical designs the team can execute.

Built and maintain an internal design system of ~100 components on Atomic Design, with one-way dependency rules, prop-based variants, and a clear boundary between generic UI and financing-domain components; defined a token-first roadmap to consolidate an organically grown palette.

Led the incremental migration of a React Native sales app from MVC-style code to feature-driven MVVM while the main branch kept shipping. High-risk changes were deferred deliberately as documented tech debt, then refactored once proven stable in production.

Designed a type-safe API layer (Zodios, Zod, TanStack Query) where a single contract generates types, query hooks, and runtime validation, with token refresh queueing to prevent concurrent refresh calls. A systematic audit found 81 of 201 endpoint definitions carrying untyped path parameters.

Driving the Flutter app migration from GetX/MVC to Bloc, MVVM, and Clean Architecture, rolled out module by module.

Built a lightweight face-liveness library in native Swift using Google ML Kit and Apple camera frameworks, validating on device.

Architect Next.js web applications, refactor legacy codebases, and design the CI/CD pipelines that make production releases boring.

Owned architecture and technology decisions across React Native (Expo, New Architecture), Flutter (Bloc/Riverpod), Kotlin Jetpack Compose (Hilt, StateFlow), and SwiftUI (Combine).

Directed mobile product development end to end, from technical specification to release, alongside product and Java Spring Boot backend teams.

Led performance and debugging work, including the query optimization that cut a critical report from 730 seconds to single digits.

Owned full-cycle people management (performance reviews, one-on-ones, career development, resourcing) and built internal tooling for progress tracking and performance assessment.

Proposed a self-hosted macOS CI runner for GitHub Actions, backed by benchmark data showing significant build-time gains over hosted runners.

Delivered full-cycle React Native features on MVVM, Atomic Design, and feature-driven architectures.

Optimized legacy systems and wired up Firebase, Expo, and Amplitude for real-time analytics.

Built and maintained native Android (Java, Kotlin) and Flutter apps; refactored legacy code and partnered with UI/UX and backend teams across Fintech and HR product lines.

Architected and delivered native Android and cross-platform iOS applications for logistics operations, deployed to field teams across multiple provinces.

Led delivery of 6 mobile applications from architecture through QA, release, and post-launch maintenance, driving crash rates down through performance profiling.

Built a production Android application end to end, from architecture design through Play Store release, applying MVC and clean code principles in a fast-moving startup.