Open to opportunities

Klara Tsai

@klaratsai

Android Developer crafting scalable Kotlin apps with Jetpack Compose, Clean Architecture, and performance-first engineering.

United States

Message

What I'm looking for

I’m looking to build scalable, high-performance Android apps in an Agile environment. I want to own features end-to-end, collaborate with iOS/backend teams, and keep raising code quality with strong testing and production monitoring.

I’m an Android Developer building and maintaining large-scale native Android applications using Kotlin and modern Android architecture. I focus on code quality, scalability, and performance monitoring, partnering across teams to deliver reliable mobile products.

In my recent role, I developed features for a large-scale native Android banking application with 1M+ active users, delivering experiences used by 300k+ users. I built scalable UI components across 500+ screens with Jetpack Compose and XML, and helped evolve a Gradle multi-module architecture to improve maintainability and build performance.

I integrate backend services with Retrofit, OkHttp, and REST APIs using Moshi, and implement asynchronous workflows with Kotlin Coroutines and Flow. I monitor stability and performance with Firebase Crashlytics and Firebase Performance Monitoring, support insights with Adobe Analytics, and have maintained production crash rates below 1% while contributing strong test coverage in Agile environments.

Experience

Work history, roles, and key accomplishments

Android Developer

ČSOB

Aug 2023 - Feb 2026 (2 years 6 months)

Developed and maintained features for a native Android banking app with 1M+ active users, supporting 300k+ users with Kotlin and modern Android architecture. Built scalable Compose/XML UI across 500+ screens, integrated REST APIs with Retrofit/OkHttp and Moshi, and improved stability using Firebase Crashlytics/Performance Monitoring while implementing Adobe Analytics tracking.

Kotlin Jetpack Compose Android SDK MVVM Retrofit OkHttp Firebase Crashlytics

Android Developer

Eman

Mar 2022 - Jul 2023 (1 year 4 months)

Built and maintained native Android features using Kotlin, XML layouts, and Data Binding, applying Clean Architecture and MVVM to improve scalability and reduce boilerplate. Integrated Retrofit/Moshi for backend APIs, delivered unit tests with 80% code coverage using JUnit/MockK, and reduced production crashes to below 1% using Firebase Crashlytics.