@nikitazayanchkovskij - Android Developer 📱 Kotlin Multiplatform Developer (Android, iOS, Kotlin, Compose, Android Studio, Xcode, SwiftUI)

Android Developer 📱 Kotlin Multiplatform Developer (Android, iOS, Kotlin, Compose, Android Studio, Xcode, SwiftUI)

Android Developer

Available for hire

Years of experience

4+ years

Available for

Full-time, Contract, Freelance

Available from

01 Oct 2026

Kotlin enthusiast with 4+ years of experience building mobile apps in Kotlin.

I'm passionate about building high-quality, maintainable, scalable and testable applications. I help companies to reduce their development costs and time-to-market, by using modern and powerful technology, such as Kotlin Multiplatform. Write the code once - run everywhere (Android, iOS, Desktop), without sacrificing native performance.

I believe that the best work is done in a calm environment. I advocate for clear documentation, thoughtful architecture, and a sustainable work-life balance.

Previous background: Before Software Engineering - I was an international transport manager for more than 5 years. This experience gives me strong domain knowledge in logistics sphere, supply chains, communication skills, etc. I easily adapt to complex business domains and can relate technical tasks with business needs.

🏡 Currently searching for a remote job. 🇵🇱 Main country of focus is Poland, but I'm also open to offers from other countries around the globe. 🌐

🤗 Soft skills: 🙋‍♂️ I am usually good at making contact with people. 👨‍💻 Good at team work and also working by myself. ⌚️ Responsible. 👨‍🎓 Fast learner. 🏄‍♂️ I like sport and active leisure.

💻 Hard skills: ✅ Kotlin Multiplatform for the shared business logic. ✅ Compose Multiplatform and Material 3 for the shared UI. ✅ Experience with publishing apps to Google Play Market. ✅ UI design with Claude Design AI. ✅ AI-assisted development with Claude Code, Gemini. ✅ Multiplatform resources: Compose and MOKO. ✅ Native UIs: Jetpack Compose for Android, SwiftUi for iOS. ✅ Android Studio and Xcode. ✅ Gradle multi-module. ✅ Git and GitHub. ✅ Clean Code and Clean Architecture. ✅ ViewModel and MVI pattern, with actions and events. ✅ Type-Safe Navigation Compose. ✅ Decompose library for navigation, and lifecycle-aware business logic components. ✅ Ktor client for networking. ✅ Kotlin Serialization for converting Kotlin objects, to data formats, like JSON and vice-versa. ✅ Kotlin Coroutines and Flows. ✅ Koin for Dependency Injection (DI). ✅ Room database. ✅ Coil image loading library. ✅ Unit tests.

📍 A few examples of my work: 🔗 GitHub: https://github.com/NikitaZayanchkovskij/ImagesKMP 🔗 Google Play Market: https://play.google.com/store/apps/details?id=com.mikitazayanchkouski.kmpcalculator

Languages: 🇬🇧 🇺🇸 English C1 - C2. I am comfortable using English as the primary language of communication in my day-to-day work, even with native speakers. 🇵🇱 Polish B1 - B2. 🇧🇾 Russian (native).

Employment History

Kotlin Multiplatform Developer ⦿ Android and iOS at ID FINANCE 2025 - 2026

📱 I have engineered the "IDF Space" mobile application, for Android and iOS, intended for the internal use inside the company, by it's employees. 🛠️ I have built the app from scratch, to a ready-to-deploy MVP (Minimum Viable Product), tightly integrated with the existing backend and web infrastructure. ✅ Key Responsibilities and Achievements: ✔ Developed the whole app, from 0 to launch, using Kotlin Multiplatform (KMP) for the shared business logic and data processing. ✔ Built optimized, platform-specific User Interfaces (UI) from Figma mockups, using Jetpack Compose and Material 3 for Android, and SwiftUI for iOS. ✔ Designed and maintained a complex, scalable Gradle Multi-Module Architecture, with 20+ feature-modules, ensuring optimal build performance and strict separation of concerns. Feature-modules include: authentication, profile, time-off, about the company, work rules, corporate culture, help desk, office desk, care and growth, etc. ✔ Implemented secure authentication flows of employees' credentials using JWT tokens. ✔ Formed a highly predictable and bug-free state management, using the MVI (Model-View-Intent) architectural pattern, with structured actions and events. ✔ Handled advanced cross-platform navigation and lifecycle-aware business logic, using the Decompose library. ✔ Engineered a high-performance network communication using Ktor client, and Kotlin Serialization for handling JSON data objects. ✔ Managed Dependency Injections (DI) with Koin library. ✔ Implemented reactive programming with Kotlin Coroutines and Flows across the whole app. 📌 Project Milestone Notes: ● I have successfully delivered the MVP in a production-ready, fully deployable state. ● Following the successful delivery – the company made a strategic decision to freeze this app’s mobile development for the upcoming financial year, to focus corporate budgets on scaling the web platform, marking a transition point for my role.

Founder | Kotlin Multiplatform Developer ⦿ Android and iOS at Sport Activity Meetings Current 2025 - Now

📱 I'm currently remaking my own application that I have released a few years ago, doing the full-cycle migration to KMP & CMP and an architectural redesign. 👨‍💻 In this project I’m doing the work of a Senior/Lead Mobile Engineer. 🛠️ I’m taking responsibility of every aspect, of how a production level application should be built like. 🌐 This is a social network level platform, designed to handle thousands of active users per day. 📜 I have created Sport Activity Meetings to allow people, who are interested in different sports, to find like-minded people, to do what they enjoy together. ✅ Key Responsibilities and Achievements: ✔ Designing and developing a highly scalable Multi-Module Architecture (10+ feature-modules) using Gradle 9, to achieve strict separation of concerns and fast build times. ✔ Developing shared business logic layers, using Kotlin Multiplatform (KMP) in commonMain source sets, across different modules, also platform-specific layers for Android and iOS in androidMain and iosMain source sets. ✔ Developing shared UI using Compose Multiplatform (CMP) with Material 3 styling. ✔ Engineering a clean data layers for networking, databases, offline-first functionality, etc. using Ktor client, Room, Kotlin Serialization etc. ✔ Managing Dependency Injections (DI) with Koin library. ✔ Implementing reactive programming with Kotlin Coroutines and Flows across the whole app. ✔ Building robust navigation with Navigation Compose. ✔ Building predictable UI state flows, using ViewModel and the MVI (Model-View-Intent) pattern, with structured actions and events. ✔ Designing and planning modern User Interface (UI) and convenient User Experience (UX) for the whole application, so the app feels pleasant and smooth for users to use. ✔ If some functionality of the app requires native UI components – also implementing them with Jetpack Compose for Android, and with SwiftUI for iOS. ✔ Implementing app localization with English, Polish and Russian languages. ✔ And more.

Founder | Android Developer with Kotlin and Android Studio at Sport Activity Meetings 2022 - 2025

📱 I have successfully built and launched a native Android social networking application, from a conceptual design, to the production release on the Google Play Store. ✅ Key Responsibilities and Achievements: ✔ Designed and shipped the native Android application, for sports enthusiasts and active people. ✔ Developed User Interface (UI) layouts using Native Android XML Views and business logic in Kotlin. ✔ Established efficient client-server communication using Retrofit networking client. ✔ Handled user media storage and real-time backend data with Google Firebase. ✔ Integrated monetization models by implementing banner and interstitial ads with Google AdMob. 🔗 App Link: https://play.google.com/store/apps/details?id=com.nikita_zayanchkovskij.sportactivitymeetingstry2 💻 Tech Stack: Kotlin, Android Studio, XML, Retrofit, Google Firebase and Storage, AdMob. 📌 Product Lifecycle Notes: ● The initial release served as an MVP (Minimum Viable Product) to validate the core product features and test deployment pipelines. ● Marketing and active user acquisition campaigns were intentionally put on hold, due to a strategic decision, to transition from legacy technologies, to a scalable, enterprise-grade infrastructure. ● Instead of scaling a legacy codebase – the focus was shifted to an architectural reboot, leading to the full-cycle migration to Kotlin Multiplatform (KMP) and Compose Multiplatform (CMP), currently underway in my next role. ⬆

Education

Bachelor's Degree, Economy and management at Private Institute of Management and Business 2013 - 2018

Android Developer 📱 Kotlin Multiplatform Developer (Android, iOS, Kotlin, Compose, Android Studio, Xcode, SwiftUI)

Skills

Languages

Employment History

Education

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