David Khol Email & Phone Number

Seoul

Seoul, South Korea

Focused on refurbishing the project and bringing it back to today's standards—reduce coupling, limit the incorrect use of singletons, kick-off migration towards a proper dependency injection, and improve the legibility and type safety of the code, ultimately leading to a clearer project structure, fewer opportunities for bugs and faster iterations implementing new features.Taught other developers about the benefits of modularization, layered architecture, the importance of structured concurrency, immutability, pure functions, algebraic data types, theory of function coloring, dependency injection, unit testing MVVM architecture, and more.Introduced a new approach to the high-level separation of concerns using Gradle composite builds that reduced development friction.Designated as a leader of an OKR focused on improving the architecture of the project, an OKR improving the testing environment, and an OKR promoting the cooperation between the UI/UX team and developers.

Manila, Philippines

Led the development of a financial app with millions of users for the Android platform.Taught developers how to write cleaner, testable and easier to read code through better utilization of Kotlin's strong type system, sealed classes, immutable types, SOLID principles, clean architecture, unidirectional flow, and dependency injection.Taught designers about the peculiarities of Android, explaining to them why their designs were not suitable for the real world.Implemented new security features (OAuth PKCE, Certificate Pinning & Transparency, SafetyNet Attestation, ...), uncovered existing security issues and lifted unnecessary restrictive security measures that severely impaired the development.Guided developers about the usage of Functional Reactive Programming using RxJava or Coroutines. Maintained Gradle infrastructure. Supervised migration to Material design. Pioneered Jetpack Compose. Assessed technical skills of candidates.

Manila, Philippines

Invited to share knowledge about modularization of monolithic Android applications and to participate in refactoring of the app.

Prague, The Capital, Czech Republic

Ackee is a mid-sized company focused mainly on the development of Android, iOS and Web applications. Personally, I collaborated on numerous projects varying in scale, target audiences and used technologies. Some of the projects I worked on include Tapito, Košík, Zonky, Hopi, Carolina and more. I also had an opportunity to play with and implement blockchain-based solution into one of our apps.

Prague, Czechia

Master'S Degree, Computer Software Engineering

Exchange Program, Computer Science

Exchange Program, Computer Science

Bachelor'S Degree, Computer Software Engineering

Exchange Program, Computer Science