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Senior Mobile & Kotlin Engineer — .NET Backend
Reactive systems · Kotlin Multiplatform · Mobile architecture · Performance
I build reliable, high-performance mobile and backend systems across Kotlin/Android, Kotlin Multiplatform, Compose Multiplatform, Flutter/Dart, iOS/Swift, NestJS, and ASP.NET Core. I'm a senior engineer with 7+ years of experience, building and shipping software since summer 2018. Beyond formal education, I am largely self-taught, with my engineering growth shaped by hands-on product work, open-source maintenance, and a long-term focus on software fundamentals.
Strong knowledge of: Clean Architecture, MVVM, MVI, Reactive Programming (RxJava/RxKotlin, RxSwift, rxdart, RxJs, Kotlinx Coroutines Flow), Kotlin/Android, Dart/Flutter, iOS/Swift.
- 🏆 RxDart maintainer & repository-wide CODEOWNER, contributing to reactive semantics, stream lifecycle, tests, and releases.
- 🧩 Author & maintainer of FlowExt and MVI-Coroutines-Flow, focused on reactive programming, concurrency, software architecture, testing, and performance.
I'm building .NET backend and data systems with DDD, CQRS, PostgreSQL, and high-availability patterns — NetAuth and the PostgreSQL HA lab.
| Project & evidence | What it proves |
|---|---|
| FlowExt Docs · Technical article |
Kotlin Multiplatform Flow semantics, structured concurrency, cancellation, cross-platform testing, and maintained library design. |
| MVI-Coroutines-Flow Tests · Releases |
Multi-module Android MVI, Clean Architecture, Coroutines Flow, extensive testing, releases, and long-term adoption. |
| GitHub Search KMM Architecture · CI |
End-to-end KMP architecture sharing data, domain, presentation, and ViewModel layers while retaining Compose and SwiftUI interfaces. |
| Selected upstream contributions FlutterFire · Koin · Khonshu · Google Ground |
Narrow fixes involving traversal, state restoration, error paths, and locking, reviewed and merged into established projects. |
| PostgreSQL HA lab Demo scenarios · Technical notes |
Failure-aware PostgreSQL topology with Patroni election, HAProxy routing, EF Core read/write splitting, retry, and consistency trade-offs. |
| NetAuth Tests · CI |
Educational ASP.NET Core design using DDD, CQRS, authentication boundaries, a transactional outbox, and multiple test layers. |
My technical writing lives on portfolio.hoc081098.dev/articles, where I write about Kotlin and mobile engineering, reactive systems, software architecture, performance, and .NET backend development.
🟣 Kotlin Multiplatform
| Library | Description |
|---|---|
| FlowExt |
Kotlinx Coroutines Flow Extensions. Extensions to the Kotlin Flow library. |
| kmp-viewmodel |
🔆 Kotlin Multiplatform ViewModel - A KMP library that provides shared MVVM for UI applications. |
| solivagant |
🔆 Compose Multiplatform Navigation - Pragmatic, type safety navigation. Based on Freeletics Khonshu. |
| kotlin-channel-event-bus |
A KMP event bus using Kotlinx Coroutines Channels. Multi-keys, multi-producers, single-consumer. |
| Library | Description |
|---|---|
| ViewBindingDelegate |
Simple one-liner ViewBinding in Fragments and Activities with Kotlin Property Delegates. |
| Khonshu | Contributed to Freeletics Khonshu navigation library. |
| Library | Description |
|---|---|
| PhDownloader |
Simple, reactive and functional downloader for iOS Swift with RxSwift & RxAlamofire. |
| # | Library | Description |
|---|---|---|
| 1 | 🏆 RxDart |
Official maintainer - ReactiveX implementation for Dart Streams. My commits |
| 2 | rx_shared_preferences |
Reactive shared preferences for Flutter. |
| 3 | rx_redux |
Redux implementation based on Dart Stream with RxDart. |
| 4 | disposebag |
Cancel StreamSubscriptions and close Sinks easily. |
| 5 | flutter_disposebag |
Auto-dispose subscriptions when disposing State. |
| 6 | sqlbrite |
Reactive stream wrapper around sqflite. |
| 7 | stream_loader |
Loading content asynchronously with Dart stream. |
| 8 | rxdart_ext |
Extension methods and classes built on top of RxDart. |
| 9 | rx_storage |
Reactive storage for Dart/Flutter. |
| 10 | listenable_stream |
Convert Listenable/ValueListenable to Stream. |
| 11 | distinct_value_connectable_stream |
Distinct value connectable stream for BLoC pattern. |
| 12 | did_change_dependencies |
Stream for didChangeDependencies lifecycle. |
| 13 | dart_either |
Either monad for Dart with monad comprehensions. |
| 14 | flutter_bloc_pattern |
BLoC pattern base class and rxdart builder. |
| 15 | flutter_provider |
Generic provider using InheritedWidget. |
| 16 | cancellation_token_hoc081098 |
Cancellation Token inspired by C#. |
| 17 | http_client_hoc081098 |
Simple and powerful HTTP client. |
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