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Mykhailo Dzhezhelo

Mobile Engineer | React Native | Web Developer

Dublin, Ireland

dzezelomihail@gmail.com+380 95 126 66 83linkedin.com/in/mihail-dzhezhelo-27a41114adzhezhelo.dev

Summary

Mobile Engineer with 7+ years of software development experience, including 5+ years building production mobile applications with React Native. Experienced in App Store and Google Play releases, Firebase, REST APIs, GraphQL, WebSockets, offline-first applications, and production support.

Professional Experience

React Native Developer, Elementica

| Uzhhorod

Vitadrop (Healthcare Mobile Application)

  • Developed and maintained a healthcare mobile application using React Native.
  • Implemented Firebase Authentication, REST API integrations, push notifications, and core application features.
  • Integrated camera functionality and OpenCV-based image analysis workflows.
  • Worked with iOS and Android native projects to integrate third-party SDKs and platform-specific functionality.
  • Participated in application releases for App Store and Google Play.
  • Collaborated with backend developers and stakeholders to deliver new features and improvements.

Vidalytics Admin Platform

  • Contributed to the development of a video analytics and player management platform using React.
  • Developed analytics dashboards and player configuration features.
  • Implemented new functionality and improvements based on business requirements.
  • Worked closely with product managers, designers, and engineers in an Agile environment.

React Native Developer, NetGame

| Kyiv

  • Developed and maintained production mobile applications for iOS and Android.
  • Delivered new features, bug fixes, and performance improvements.
  • Investigated and resolved production issues using Firebase Crashlytics and analytics tools.
  • Supported release cycles and post-release maintenance.

Applications:

  • BetKing Casino & Sportsbook
  • 777 UA Casino

Full Stack / React Native Developer, Kultprosvet

| Dnipro

  • Developed mobile and web applications using React Native, React, TypeScript, and Node.js.
  • Built backend services and APIs using Express, GraphQL, GraphQL Subscriptions, and MySQL.
  • Participated in code reviews, sprint planning, task estimation, and mentoring activities.
  • Worked directly with clients and stakeholders throughout the development lifecycle.

Waddingtons Auctions

  • Developed and maintained a mobile auction platform built with Expo and React Native.
  • Implemented new features and enhancements while supporting the application over a two-year period.
  • Helped migrate auction functionality from a web platform to mobile applications.

Amako

  • Maintained and enhanced a workforce management application used by field engineers.
  • Implemented offline data storage and WebSocket-based real-time synchronization.
  • Upgraded the project from an outdated React Native version to a modern release.
  • Delivered new features and performance improvements while maintaining existing business workflows.

Education Platform

  • Developed functionality for an educational platform used by teachers and students.
  • Built backend services, administration features, and real-time functionality.
  • Worked with React Native, React, GraphQL, and GraphQL Subscriptions to support mobile and web applications.

Junior React Native Developer, Devsteam.mobi

| Kiev

  • Contributed to the development of a React Native audiobook application.
  • Implemented audio playback functionality and offline content storage using SQLite.
  • Integrated REST APIs for content synchronization and user management.
  • Improved application stability and performance through bug fixing and maintenance.

JavaScript Developer, Absolutist

| Dnipro

  • Participated in migration of browser games from ActionScript to JavaScript and TypeScript.
  • Implemented new functionality and maintained existing game codebases.
  • Worked on bug fixing, performance improvements, and feature development.
  • Collaborated with developers, designers, and QA engineers throughout the development process.

Skills

React Native: React Native CLI, Expo, Navigation, State Management, Push Notifications, Deep Linking, Offline Storage, App Store & Google Play Releases

TypeScript & JavaScript: ES6+, TypeScript, Async Programming, API Integration, Performance Optimization

React: React, Hooks, Redux Toolkit, React Query, Zustand

Mobile Development: iOS, Android, Firebase, SQLite, Mobile Architecture, Production Support

Backend Development: Node.js, Express, REST APIs, GraphQL, GraphQL Subscriptions

Real-Time Applications: WebSockets, GraphQL Subscriptions, Real-Time Synchronization

Databases: MySQL, MongoDB, SQLite

Development Tools: Git, Docker, Postman, Firebase Crashlytics, App Store Connect, Google Play Console

Collaboration & Leadership: Code Reviews, Sprint Planning, Task Estimation, Mentoring, Stakeholder Communication

Projects

Vitadrop

  • Developed and maintained a healthcare mobile application using React Native.
  • Implemented Firebase Authentication, REST API integrations, push notifications, and core application features.
  • Integrated camera functionality and OpenCV-based image analysis workflows.
  • Worked with iOS and Android native projects to integrate third-party SDKs and platform-specific functionality.
  • Participated in App Store and Google Play release processes.
  • Collaborated closely with backend developers and stakeholders to deliver new features and improvements.

Technologies: React Native, TypeScript, Firebase, REST API, VisionCamera, OpenCV Integration

Waddingtons Auctions, Mobile Auction Platform

  • Developed and maintained a production mobile auction platform built with React Native and Expo.
  • Helped migrate auction functionality from a web platform to mobile applications.
  • Implemented new features and enhancements while supporting the application over a two-year period.
  • Collaborated with backend developers and product stakeholders to improve user experience and platform functionality.

Technologies: React Native, Expo, TypeScript, REST API

Education Platform

  • Participated in development of an educational platform for teachers and students.
  • Developed mobile and web functionality using React Native and React.
  • Built backend services using Node.js, GraphQL, and GraphQL Subscriptions.
  • Implemented real-time classroom management and user synchronization features.
  • Developed administration functionality for teacher and lesson management.

Education

Master's Degree in Systems Analysis, Oles Honchar Dnipro National University

09/2019 – 02/2021 | Dnipro

Bachelor Degree in Systems Analysis, Oles Honchar Dnipro National University

09/2015 – 06/2019 | Dnipro

Languages

  • Ukrainian — Native
  • Russian — Native
  • English — Intermediate (B1)