flagship

Built & shipped solo

Suby

See every charge coming.

A subscription tracker that warns you days before each renewal. Free, no ads, no bank login, data on the device. Built solo.

“I built Suby because subscriptions should be easy to see coming — without handing over a bank login.”Konstantin · wording for owner review

• Live on Google Play & App Store
• iOS & Android
• Kotlin Multiplatform · Compose

1.8.0 · Nov 2026

Read the case study subyapp.com

selected work09

Kimplify★ 20 on DeciDeci, Kurrency, KCountries, Cedar Logger. KMP libraries from production code.Open sourceEvery KMP target

Exact decimal money, currency formatting, country data and logging. Each one was pulled out of a real app.

stack

Kotlin Multiplatform

shipped

Nov 2026

Project notes DeciKurrencyKCountriesCedar Logger

KPayment★ 16Apple Pay and Google Pay behind one Kotlin API.Open sourceiOS · Android · Web

Built at Maytes and released as open source. Each wallet runs natively on its own platform.

stack

Kotlin Multiplatform · Kotlin/JS

shipped

Oct 2026

Project notes GitHubArticle

Metronomeruns in the browserA focused rhythm tool. Tap tempo, subdivisions, tempo trainers.LiveAndroid · iOS · macOS · Web

One Compose Multiplatform codebase on four targets, including the web.

stack

Compose Multiplatform

shipped

Nov 2026

Project notes Try itGitHub

LLingvoprivateLocalization for mobile and KMP teams that does not bill per language.BuildingWeb · CLI

Kotlin end to end: a Ktor API, a web app, and a CLI made for CI. Source is private while it takes shape.

stack

Ktor · Kobweb · Kotlin CLI

shipped

In progress

Project notes

SLEKE.draftApps for a de-Googled Android phone.Client workAndroid

Work with Sierra Nevada Digital. Most of the code is private. Two public pieces are linked. Wording to be confirmed with them.

stack

Kotlin

shipped

2026

Project notes sleke-migratefix-my-texts

Honqon Google PlayAustralian driver knowledge test trainer.LiveAndroid · iOS

Mock tests and spaced repetition for the Driver Knowledge Test.

stack

KMP · Compose Multiplatform

shipped

Jul 2026

Project notes Google PlayGitHub

Mac tools★ 6 on FreeDroidFreeDroid, Room and KMPace. Small native utilities.Open sourcemacOS

Android files in Finder, a disk and memory monitor, and a menu-bar control center for Gradle and devices.

stack

Swift · SwiftUI

shipped

Oct 2026

Project notes FreeDroidRoomKMPace

IDE plugins★ 9 on Drawable PreviewMercury and Drawable Preview for Android Studio.Open sourceIntelliJ · Android Studio

Mercury draws your Room schema as a tree and ER diagram. Drawable Preview shows rendered drawables in the project tree.

stack

Kotlin · IntelliJ Platform SDK

shipped

May 2026

Project notes MercuryDrawable Preview

Fishing Notes★ 11Mark spots, log each catch, check the weather first.Open sourceAndroid · iOS

I led three developers on the first version in 2021 and still maintain it.

stack

KMP · Compose · Firebase · Ktor

shipped

Jul 2026

Project notes GitHub

Proof points and shipped labels are from the 12 Nov 2026 snapshot, not live counters. SLEKE. wording is a draft pending client approval. Honq’s iOS listing is unverified.

contributions

shipping log

1. 11 Nov

   Suby 1.8.0 on the App Store. Monthly spending plan, quick add from widgets, custom categories, app lock.

2. 6 Nov

   Kurrency updated. Historical last-push date, not a tagged release.

3. 5 Nov

   Metronome updated. Historical last-push date, not a tagged release.

4. 23 Oct

   Room for macOS updated. Historical last-push date, not a tagged release.

5. 13 Oct

   KPayment updated. Historical last-push date, not a tagged release.

Suby entry is from the App Store listing captured in the approved mockup. The rest are historical last-push dates until releases are tagged.

experience

• 2024 — now
  Senior Android Engineer, Maytes

  Consumer payments, formerly KttiPay. Led a legacy Java app to one shared Compose Multiplatform codebase for Android, iOS and web, without a big-bang rewrite. Built the design system. Open-sourced the money and payments libraries along the way.

• 2023 — 2024
  Android Engineer, On-Pin

  Tablet and in-cart apps for golf courses. Java to Kotlin, fewer crashes, support for an old device fleet.

• 2023 — 2024
  Android Engineer, freelance

  A reading and audiobook app, and an open source suite of everyday Android apps.

• 2022 — 2024
  Android Engineer, GameForest

  A two-sided delivery product with live location, and a restaurant chain app.

• 2022 — 2024
  Master's, AI and Big Data

  Far Eastern Federal University.

writingProAndroidDev

• Money
  Floating point can't hold a cent. BigDecimal can, until commonMain
• Payments
  KPayment: Apple Pay and Google Pay for Kotlin Multiplatform
• Compose
  Type-safe bottom navigation in Jetpack Compose
• Compose
  A Spotify-inspired buffering slider in Jetpack Compose
• Android
  Foreground services in Android 14: what's changing

contact

The fastest way to reach me is Telegram or LinkedIn .

Code is on GitHub . Articles are on Medium .