Dmytro

Dmytro Moiseienko
Email: [open contact info](look above in the "contact info" section)
Linkedin: [open contact info](look above in the "contact info" section)

Summary:
Senior Frontend Developer with 7+ years of experience. Has taken mobile and web apps
from zero to production, owned full release cycles, and contributed to architecture in
cross-functional product teams. Known for clean UI implementation, thoughtful state
management, and pragmatic technical decision-making.

Tech stack
Core & Frameworks:React Native, Next.js, React, TypeScript, Expo
State & Architecture: Redux Toolkit, Zustand, RTK Query, TanStack Query (React
Query)
Navigation & Routing: React Navigation, Expo Router
Storage & Security: MMKV, SQLite, SecureStore, AsyncStorage
UI, Animation & Forms: React Native Reanimated, React Native Skia, React Hook
Form, Tailwind CSS / NativeWind, Storybook
Networking & APIs: REST API, WebSockets , OpenAPI Codegen, GraphQL (Codegen)
Mobile Infrastructure & CI/CD: EAS Build, Fastlane, GitHub Actions, Firebase (FCM),
RevenueCat
Tooling & Workspaces: Monorepos (Turborepo/Lerna/NX), ESLint, Prettier, Jest, React
Testing Library
AI-Assisted Development: Cursor, Claude, GitHub Copilot

Employment history:
Senior Frontend Developer (React Native)
UN1Q, Malta (remote, contract), September 2025 - June 2026
Project: Fitness&Nutrition React Native application https://un1q.com/

● Engineered a healthcare/fitness app from the ground up as sole mobile
developer, later onboarding and mentoring an expanding engineering team
● Designed and implemented a local-first SQLite architecture with relational tables
to persist health data, progress metrics, and backend calculations locally
● Built a server-driven action system allowing the backend to dynamically trigger
runtime UI behaviors and user flows
● Architected a persistent, normalized state management system with Redux
Toolkit integrated with local storage, alongside a shared design token/component
library used across mobile and web within a monorepo
● Accelerated feature delivery by ~30% by building a shared monorepo component
library and automated Storybook previews deployed via CI/CD to GitHub Pages
● Shaped product UX through architectural trade-off evaluations, drove code
reviews, and established engineering standards for the team

Senior Frontend Developer (React Native)
Altamira, Slovakia (contract), May - September 2025
Project: Booking platform for schools and nurseries AppStore , Google Play

● Stabilised and advanced the application to beta MVP as the sole developer before
onboarding a second engineer to scale the team
● Resolved bugs and optimized core booking user flows integrated with TrueLayer
payment processing
● Configured OpenAPI codegen to auto-generate fully typed API clients,
significantly reducing integration overhead and type safety errors
● Conducted code reviews, facilitated team knowledge sharing, and ensured
smooth UI performance across iOS and Android devices
● Set up CI/CD pipelines (EAS) for automated iOS and Android builds, OTA
updates, app submit
● Optimized list rendering (FlashList / FlatList) and smooth 60 FPS animations for
high-performance UI
● Integrated Sentry for real-time mobile crash analytics and performance tracking.

Senior Frontend Developer (Next.js)
Altamira, Slovakia (contract), January - May 2025
Project: Risk assessment CRM platform for an energy sector enterprise level

● Developed complex multi-level forms with validation, dynamic API-driven tables,
and long-polling for asynchronous backend calculations.

● Designed navigation using App Router and built a foundational component
library with PrimeReact used across the platform.
● Streamlined API integration with React Query for optimal caching and
implemented a Role-Based Access Control (RBAC) system.
● Maintained code quality through automated testing and code reviews while
actively proposing and driving technical solutions

Frontend Developer (React Native)
MasterDynamix, Ukraine (contract)
September 2024 – January 2025
Project: Boxing social network and managing platform - Ready To Fight (RTF) App
Store , Google Play

● Built fight analytics and forecasting modules from scratch with interactive data
visualisations, implementing a Pro subscription paywall for prediction features
● Developed user account sections including prediction history, results tracking,
and transaction management within a multi-chain Web3 crypto wallet
environment
● Developed custom Native Modules (iOS/Android) to bridge native device APIs
and optimize performance-critical application features.
● Handled In-App Purchases (IAP) integration on iOS and Android for seamless
subscription management and paywall execution
● Refactored core UI components and executed a broad design update across the
app, improving overall UI consistency and design system maintainability
● Actively contributed to UI/UX discussions, proposing and advocating for
interface improvements that directly shaped key product decisions
● Participated in code reviews, maintaining code quality and engineering standards
across the team

Senior Frontend Developer (React/React Native)
RollNCode, Ukraine (contract, remote), August 2022 - August 2024
Project: Social network with a peer support platform & ERP to manage agents,
Streaming Media platform mobile app Google Play , Google Play Second App

● Maintained and evolved two production iOS/Android apps: a peer-support
platform with Sendbird (WebSocket-based)real-time chat and a content/media
app (podcasts/video) with an integrated ERP system for agent and chat
management
● Built a full-featured media player handling audio/video playback, background
playback control, persistent playlists, and lock-screen media integration
● Built a hierarchical knowledge base from scratch featuring full-text search and
seamless in-chat article linking between support agents and end-users
● Independently owned the complete release lifecycle for both apps across the App

Store and Google Play, handling versioning, compliance, store submissions, and
emergency hotfixes
● Collaborated directly with key stakeholders to translate business requirements
into technical solutions and align development priorities

Frontend Developer (React Native)
Peppy, UK December 2019 - August 2022
Project: Healthcare&Wellbeing application

● Developed key features and cross-platform UI components for a high-impact
healthcare and wellbeing mobile application
● Built a custom Headless CMS parser, converting web-based markup directly into
native, highly responsive React Native components
● Extended and maintained Sendbird (WebSocket) chat features and configured
deep-linking architecture for direct in-app navigation from push notifications
and external triggers
● Integrated Firebase for reliable push notifications, app messaging, and
background data management
● Managed complex client-side state for health tracking forms, chat sessions, and
user onboarding flows
● Integrated analytics tracking (Mixpanel/Segment) to help product team track
user engagement and retention metrics

WordPress & Frontend Developer
Ne1Creative, UK (2016–2020),
Peppy, UK (2019),
NDA, Belgium (2016–2019),
Upwork Freelance (2012–2015)

Education

Sumy State University — Specialist's Degree (5-year program) in Information
Technology
2007 – 2012

Additional Information

● English: Upper-intermediate (B2)
● Ukrainian: Native
● Russian: Native