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Java/ Kotlin/Android engineer with 2 years of experience enhancing Whoscall, a leading Asian caller ID app with 500M+ users. Specializing in native mobile architecture, actively expanding expertise with Spring Boot to build full-stack application services I have free access to the Czech labor market and don’t need a work permit for roles in the Czech Republic.…

Polly Anna Wu

Developer, Programmer, App Developer, +4

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Java/ Kotlin/Android engineer with 2 years of experience enhancing Whoscall, a leading Asian caller ID app with 500M+ users. Specializing in native mobile architecture, actively expanding expertise with Spring Boot to build full-stack application services I have free access to the Czech labor market and don’t need a work permit for roles in the Czech Republic.…

Available to hire

Java/ Kotlin/Android engineer with 2 years of experience enhancing Whoscall, a leading Asian caller ID app with 500M+ users. Specializing in native mobile architecture, actively expanding expertise with Spring Boot to build full-stack application services
I have free access to the Czech labor market and don’t need a work permit for roles in the Czech Republic.

Skills

Experience Level

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Czech

Beginner

Work Experience

Software Engineer at Gogolook

January 1, 2024 - Present

Maintained the flagship product Whoscall, impacting over 500 million users, while ensuring Firebase Crashlytics stability rate remained above 99.5%. Modernized and re-architected the product focusing on modularization and migrating UI components to Jetpack Compose, contributing to a complete product revamp. Refactored legacy MVP and MVC architectures into a modular MVVM framework, utilizing MockK and JUnit to achieve 100% unit test coverage across modules. Developed a Kotlin SDK with decoupled Android components and interfaces optimizing cross-platform portability for seamless internal and OEM product integration, impacting 100k users across three Asian countries. Created automation tools using Linux shell scripting to process and categorize i18n image assets for over 5 languages and 3+ screen densities, helping a 10-member team reduce manual classification time by 80%.

Software Engineer at AIWORKS

December 1, 2023 - August 9, 2025

1. Built a social video call app 'Chair' from scratch within 5 weeks, enabling peer-to-peer video calls using WebRTC and Firebase Firestore as the STUN server. 2. Designed and implemented an e-commerce auction app with real-time bidding, using WebSocket with a 7-member team including backend and iOS engineers.