Looking for a job

Sergey Filonuyk

@sergeyfilonuyk

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I build reliable Android and iOS apps with Kotlin Multiplatform.

Russian Federation

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What I'm looking for

I'm open to remote positions and contract work where I can build reliable Kotlin Multiplatform apps for Android and iOS. I'm happy to work in English or Russian.

I build Android and iOS apps from a shared Kotlin Multiplatform codebase, with 2+ years of commercial experience.

At FullStack, I worked on Skill, a multi-sport GPS tracking app. I fixed GPS track corruption with atomic file writes, kept the foreground GPS service alive after process death, and supported non-GMS devices.

I also migrated Google Play Billing from version 4 to 8, resolved a Play Store rejection using Photo Picker, and wrote custom Detekt rules to enforce architecture boundaries in CI.

Previously at EagleDev, I migrated an Android app to Kotlin Multiplatform, shared business logic across Android and iOS, built type-safe Compose Navigation, and integrated MyTracker analytics and APNS push notifications.

Experience

Work history, roles, and key accomplishments

Kotlin Multiplatform Developer

FullStack

Jul 2025 - Aug 2026 (1 year 1 month)

Skill — multi-sport tracking app for Android and iOS, built with Kotlin Multiplatform.
- Fixed GPS track corruption: recordings are written to a .tmp file and moved atomically on finish — eliminated zero-byte tracks being uploaded as valid data.
- Made the foreground GPS service survive process death: AlarmManager-based restart, FusedLocationProvider, START_STICKY; investigated LMK/NDK crashes wit

Kotlin Multiplatform Developer

EagleDev

Jun 2024 - Jul 2025 (1 year 1 month)

- Migrated an Android app to Kotlin Multiplatform, sharing business logic between Android and iOS.
- Implemented type-safe Compose Navigation with custom NavTypes.
- Integrated MyTracker SDK analytics and APNS push notifications on iOS.