Contribution

• Shipped a 15-screen Android and iOS MVP from idea to Google Play and App Store in Kotlin, Compose Multiplatform and Swift, with CI/CD and observability from the first release, so the founders could start user acquisition.
• Built purchases end to end: native Stripe integration on Android and iOS plus the backend API, so the MVP launched with payments.
• Added 3 API endpoints to the Node.js/Golang backend, wired OCR into the product flow, and fixed backend performance issues.
• Built the "Pricer" microservice (Node.js, TypeScript) and the "Inventory" web feature (React, TypeScript) outside the mobile scope.
• Established an agentic coding harness for the mobile codebase (architecture docs, progressively discoverable feature specs, guidelines, rules, relevant tech skills), so AI-generated code kept to the Gradle module boundaries and data/domain/presentation layers.

Tech stack

• Kotlin
• Compose Multiplatform
• Swift
• Gradle multi-module (data/domain/presentation)
• Stripe SDK
• CI/CD
• observability
• AI coding agents (Claude Code, Codex)
• Node.js
• TypeScript
• Golang
• REST API
• OCR
• React

Contribution

• Drove the first multi-screen feature migration in TrustSDK: moved Native Coin Staking from 3 native codebases (Kotlin, Swift, TypeScript) into Kotlin Multiplatform with shared Compose UI, cutting maintenance and QA time by about 2/3 for a 200M+ user wallet.
• Built Stablecoin Staking 0→1 as the only permanent engineer: business logic written once in KMP, one Compose Multiplatform UI for Android and iOS; profit beat expectations (figures under NDA).
• Rebuilt the Earn tab for its redesign and built My Portfolio, with loading states that keep the UI responsive while balances load.
• Traced slow Portfolio balance loading from client to backend, proposed an API-side caching design that the backend team built, and moved Android and iOS to the new endpoint, cutting average load time by 80%.
• Laid early TrustSDK foundations: shared core and UI components, unit-test mocking for shared logic, dynamic i18n for the Browser Extension and CI workflows; fixed the first integration issues on iOS and the extension together with platform engineers.
• Started a Storybook app that renders every state of the shared UI components; 10+ engineers across squads used it to pick components and check UI changes in PR review.
• Served as release coordinator across Android, iOS and Browser Extension, fixing build and publishing blockers during production releases; ran 25 technical interviews and onboarded new joiners.

Tech stack

• Kotlin Multiplatform
• Compose Multiplatform
• Kotlin
• Swift
• SDK API design
• unit testing
• CI/CD
• Aave V3 (stablecoin staking deposits)
• TypeScript
• React
• dynamic i18n
• SDK integration

Screenshots

Trust Wallet — Earn: stablecoin and native staking
The staking flow shipped from the shared Kotlin Multiplatform SDK and rendered with Compose Multiplatform on Android and iOS: browsing rates, opening a position, confirming the on-chain deposit, and tracking the portfolio. Internal development build.

Contribution

• Built the health-data pipeline from scratch: ingestion from wearables such as CGM trackers and other integrations, processing over Kafka, ML subsystem calls and report generation, on Ktor and PostgreSQL.
• Integrated AI reasoning (OpenAI API) with vector-store retrieval (RAG) over a set of medical papers: it searched clients' wearable data for patterns and gave coaches suggestions and insights with source references.
• Wrote DTOs, networking and presentation logic once, as a Kotlin Multiplatform library shared by the Android app and the TypeScript/React web app, so both clients ran the same tested code.
• Built the web app in TypeScript and React on top of the shared library, giving specialists chart reports in the browser.
• Built the Android app (Kotlin, Jetpack Compose) for manual measurements and reports on top of the shared Kotlin Multiplatform library.
• Set up GitLab CI/CD with unit and integration tests for the backend and both frontends, Docker deployment and Prometheus/Grafana monitoring; the platform ran in production for 6+ months.

Tech stack

• Kotlin
• Ktor
• PostgreSQL
• Apache Kafka
• Kotlin Multiplatform (shared DTOs, networking, presentation logic)
• TypeScript
• React
• Telegram bot
• Docker
• Prometheus
• Grafana
• GitLab CI/CD
• Jetpack Compose
• Kotlin Multiplatform

Contribution

• Redesigned almost every screen of the Portfolio Investment Management app and built a shared style and component library for the new design system, with light/dark themes and RTL support.
• Built new features on the trader profile, fund details, investment creation and My Investments screens, including a stop loss / take profit screen and trader profile editing.
• Kept two investment apps (Portfolio Investment Management and Social Trading) healthy: fixed a screenshot-related security issue and RTL/locale bugs, removed top-priority tech debt (kotlinx-synthetics migration), sped up Gradle scripts and raised unit-test coverage.

Tech stack

• Kotlin
• Jetpack Compose
• Custom Views
• design system
• RTL/localization
• Gradle
• unit testing

Screenshots

Exness — portfolio investment management
Investments, fund details, fee reports and the trader profile, rebuilt on the shared design system — shown in both themes and in a right-to-left Arabic locale. Internal stage and debug builds, so the accounts and fund names are test data.

Contribution

• Built the Market Depth screen from scratch: a live order book with aggregated bid/ask ladders, custom views and animations, on gRPC data with Coroutines and Flow.
• Wrote a dozen reusable custom views shared by the Exante, FlowBank and white-label apps, and established a storybook app for developing and debugging them in isolation.
• Profiled and fixed memory leaks and performance issues in UI rendering and data processing, with a noticeable gain in app responsiveness.
• Made the legacy multi-module codebase easier to work with: Kotlin DSL builds, version catalogs, ViewBinding instead of synthetics, a module dependency graph and docs for non-trivial classes.

Tech stack

• Kotlin
• Java
• MVVM
• multi-module Gradle (Kotlin DSL, version catalogs)
• Custom Views
• Coroutines & Flow
• gRPC
• ViewBinding

Screenshots

Exante Trading — portfolio, quotes and market depth
Account summary, instrument search across exchanges, candlestick charts, and the market depth screen built from scratch.

Contribution

• Built about 20% of the FlowBank app's screens, a Swiss trading and investing app built on the shared codebase.

Tech stack

• Kotlin
• MVVM
• multi-module Gradle
• Custom Views
• Coroutines & Flow
• gRPC

Screenshots

FlowBank — portfolio, products and activity
Portfolio value and holdings, themed product discovery, instrument search, order activity and multi-currency account transfers.

Contribution

• Set up white-label generation and per-brand customization from one codebase, shipping branded trading apps for brokers such as Gozo, FlowOne, Taighan and CGS-CIMB without forks.

Tech stack

• Kotlin
• Gradle build variants
• white-label build tooling

Contribution

• Rewrote 90% of the VORON.Black premium carsharing app as its only Android developer, with a full redesign; after handover it ran on Google Play unchanged for 14 months with no crashes at a few hundred DAU.
• Built new features end to end: car delivery to a point on Google Maps inside per-car boundaries, ride history, profile, referral/bonus program, car catalog, photo attachments during a rent session and service engineer tools.
• Moved the app to targetApi 27 (runtime permissions for location and camera, FileProvider), fixed all Play Console crashes, and sped up the screens where the app visibly lagged.

Tech stack

• Kotlin
• MVP
• multi-module (data/domain/UI)
• RxJava
• Retrofit
• Google Maps
• geolocation
• Bluetooth
• payments
• push notifications
• JivoChat

Screenshots

VORON.Black — premium carsharing
The full flow: finding a car on the map, browsing the catalog, booking, running a rent session, ordering delivery, and reviewing ride history and bonuses. Russian-language UI.

Contribution

• Built two basketball training apps (MoveUp junior & pro) from scratch as the only developer: week-by-week programs, an ExoPlayer video exercise player, exercise library, athlete profile and coach chat, with social sign-in and Google Pay.

Tech stack

• Kotlin
• MVP
• multi-module (data/domain/UI)
• Cicerone
• RxJava2
• Retrofit + OkHttp
• Room
• ExoPlayer
• Custom Views
• social sign-in
• Google Pay

Screenshots

MoveUp — basketball training programs
Levelled training courses, a week-by-week progress tracker, a video exercise player with per-exercise key points, and a chat with certified coaches. Russian-language UI.

Contribution

• Built the HyperScript Android client from scratch: operators follow sales scripts step by step with branching answers, plus script templates and categorized notes.

Tech stack

• Kotlin
• MVP
• Cicerone
• RxJava2
• Retrofit + OkHttp
• Room

Screenshots

HyperScript — sales script assistant
The web constructor where a script is drawn as a decision graph, and the Android client that walks an operator through it step by step. Mixed Russian and English UI.

Contribution

• Built the Ryazan 2020 city guide from scratch as the only developer: a guest card with QR discount code, event programme, Google Maps points of interest, venue discounts, transport info and a support form.

Tech stack

• Kotlin
• MVP
• Cicerone
• RxJava2
• Retrofit + OkHttp
• Room
• Google Maps

Screenshots

Ryazan 2020 — New Year Capital city guide
Guest card with a QR discount code, the festival programme, a map of sights, venue discounts and a support channel. Russian-language UI.

Contribution

• Maintained and extended 5 client apps (MCGC golf club, LifeClub, CoralClub, Baller, Sbagry): tournament registration, Google Pay, push notifications, and a 50% redesign of MCGC.

Tech stack

• Kotlin
• Java
• Google Pay
• push notifications

Contribution

• Built a coaching Telegram bot (Node.js, MongoDB) with a React admin page where a trainer reviewed athletes' check-ins and replied with diet and exercise advice.

Tech stack

• Node.js
• MongoDB
• React
• Bootstrap
• Telegram Bot API

Contribution

• Built the whole system from scratch as its only engineer, agreeing features directly with the co-founders, and ran the Node.js/MongoDB backend on the company's own servers.
• Built the React web app (TypeScript, Bootstrap, Chart.js) with xls(x) import and server-side PDF reports, so coaches could browse athlete data from a laptop, tablet or phone.
• Built the Android data-input app (Java, MVP/Moxy, Dagger2, RxJava2, Retrofit, GreenDao) for anthropometry, gas-analyzer and other sensor measurements from lab equipment.
• Load-tested the system to find its concurrent-user limit, and hired freelancers when the scope needed more hands.

Tech stack

• TypeScript
• React
• Bootstrap
• Chart.js
• Node.js
• MongoDB (3-host replica set)
• REST API
• server-side PDF generation (phantom.js)
• load testing
• Java
• MVP (Moxy)
• Dagger2
• RxJava2
• Retrofit + OkHttp
• GreenDao

Contribution

• Built the Discounts feature end to end: data layer changes, new custom views and redesigned product cards on every screen.
• Rebuilt app navigation for the redesign, moving from a left drawer and separate Activities to bottom navigation on Fragments, and reworked the deep-link handler to match.
• Built PushWoosh broadcast notifications from scratch and improved targeted GCM pushes (order status, replies, personal offers).
• Added AppMetrica events and goals across the app for the analytics team.
• Added promo banners to the search results list, mixed in between product cards.
• Led a Gradle build-configuration tuning that cut build time from 5 minutes to 2 for the Android team.
• Set up GitHub, TeamCity CI and the git-flow branching model for the Android team after the handover from an outsourcer.

Tech stack

• Java
• MVP (Moxy)
• RxJava
• Retrofit + OkHttp
• Custom Views
• PushWoosh
• GCM
• AppMetrica
• Gradle
• TeamCity

Screenshots

Yandex.Market — catalog, discounts and home
The category catalog, the "Discounts" feature, and the redesigned home screen with bottom navigation. Russian-language UI.

Contribution

• Built the pilot of "Yandex.Market for partners" from scratch: an Android app where stores upload price lists and track indexing and stats.

Tech stack

• Java
• MVP
• Dagger 2
• RxJava