Fișier CV încărcat

Front-End Developer

Kyiv, Ukraine | Open to office & remote work

Profile Summary

Mobile-first React Native / React Developer with 3+ years of commercial experience building and maintaining large-scale production mobile, web, and admin applications. Strong understanding of the full mobile development lifecycle, including estimation, architecture, animations, real-time features, background tasks, performance profiling, release, and post-release support. Experienced with enterprise-level Firebase ecosystems, analytics SDKs, mobile security, performance optimization, and CI/CD-driven delivery.

Technical Skills

Mobile & Frontend

• JavaScript, TypeScript, HTML5, CSS3, SASS
• React Native, React, Next.js
• React Hooks, custom hooks
• Redux Toolkit, Redux Saga, Thunk, RTK Query, Redux Persist, Axios, REST
• Reanimated 2/3 (shared values, worklets), Gesture Handler
• Lottie, React Spring animations
• Pixel-perfect UI implementation from Figma
• Complex navigation (stack, tabs, drawer, deep linking)
• CI/CD pipelines (GitLab CI/CD, Codemagic)
• Validation: Yup, Zod

Firebase, Analytics & SDKs

• Firebase Auth, Realtime Database Firebase Crashlytics, Cloud Messaging
• GA4 Analytics, AppsFlyer, CleverTap, mParticle, Facebook SDK
• iOS App Tracking Transparency (ATT)

Advanced Mobile Features

• Real-time communication (WebSockets/Socket.IO)
• Background tasks (geolocation, timers, push notifications)
• Maps & geolocation (Google Maps, clustering, places, geo-based logic)
• Camera & media handling (Vision Camera, photo, video, audio)
• Internationalization (i18next, EN/ES)

Quality, Performance & Security

• Profiling: Flipper, Android Profiler, Xcode Instruments
• Jest (unit & component tests)
• ESLint (custom rules & configs)
• Proguard configuration
• Semgrep (static security scanning)
• SSL pinning, jailbreak/root detection
• Sensitive data masking, API key protection
• Fraud prevention and business logic hardening
• Dependency, Gradle and NDK updates

Release & Store Experience

• Managed App Store and Google Play releases, staged rollouts, hotfixes
• Multi-scheme builds and environment configuration
• Post-release monitoring and crash resolution

Backend & DevOps (Supporting + Bench)

• Node.js, Nest.js (TypeORM), Express.js
• REST API integration, JWT-based authentication
• MongoDB, PostgreSQL, Firebase Realtime Database
• Test automation: Selenium, Ansible
• AWS (Amplify, S3, Cognito), DigitalOcean (Nginx, PM2), Docker
• Multi-environment configuration (UAT/staging/production)

Tooling

• Android Studio, Xcode
• Postman, Swagger
• Figma, Jira, Trello, Slack
• AI: Cursor, Gemini, Claude, Open AI, Copilot

Experience

Celadon React Native / Front-End Developer
Feb 2022 - Oct 2025

Worked on multiple enterprise mobile and web applications, taking ownership of features from estimation and architecture to release and long-term support.

Responsibilities & Impact:

• End-to-end development of mobile and web features
• Feature estimation and architectural decisions (navigation, state, modules)
• Integration of Firebase, analytics, and marketing SDKs
• Implementation of real-time features and background processes
• Performance profiling, crash analysis, and optimization
• App Store / Google Play releases, hotfixes, and monitoring
• Improved mobile security and stability to meet App Store and Google Play requirements
• CI/CD automation and multi-environment builds
• Conducted code reviews and participated in technical decision-making
• Created technical documentation and supported knowledge transfer between teams
• Active collaboration with backend and product teams

Selected Projects

Food Delivery Platform (Production)
Oct 2023 - Oct 2025
Mobile (Primary) + Web + Admin | React Native, React, TypeScript, Next.js

• Developed and maintained a large-scale production ecosystem (mobile app, web app, admin panel)
• Multi-environment setup (UAT / GT / Production) with automated builds
• Firebase ecosystem: Crashlytics, Messaging
• Integrated analytics & attribution SDKs: AppsFlyer, CleverTap, mParticle, Facebook, GA4
• Implemented OTP flows, loyalty program, and geo-based offers
• Built complex navigation and deep linking (custom + AppsFlyer OneLink)
• Implemented background tasks (geolocation, timers, push notifications)
• Improved UX with skeletons, animations, and smooth transitions
• Optimized performance (rendering, timers, lists)
• Fixed crashes, refactored legacy code, removed unused logic
• Implemented mobile security: SSL pinning, jailbreak detection, sensitive data masking, API keys transfer to backend, Fraud issues
• Participated in App Store / Google Play releases and post-release support
• Added and maintained automated tests (Jest)

Sports Management & Sponsorship Platform
Mar 2023 - Oct 2023
Web + Admin | React, Typescript, Next.js, React admin, Tailwind, AWS

• Developed modules for collectives, contracts, and donations
• Built responsive and consistent UI using Tailwind with custom design system extensions
• Developed admin panel with React admin
• Integrated frontend with Nest.js backend services
• Implemented authentication with AWS Amplify & Cognito
• Uploaded and managed media via AWS S3
• Merged legacy and new application logic based on updated requirements

Advertising Analytics Platform
Sep 2022 - Mar 2023
Mobile + Web | React, React Native, JavaScript, Redux Saga

• Built the mobile application from scratch, including project setup, architecture, and core features
• Implemented real-time analytics using WebSockets/Socket.IO
• Built advanced map-based visualization (polygons, clusters, geolocation)
• Developed background data synchronization and tracking
• Implemented media capture (photo, video, audio) and uploads to AWS S3
• Localization support (EN / ES)
• Integrated complex forms with React Hook Form and Yup
• Optimized rendering for map-heavy and data-intensive screens

Vehicle Inspection Platform
Mobile + Web | React, React Native, JavaScript

• Stabilized legacy application and fixed critical issues
• Implemented new mobile features: signature capture, inspection points, global search, and email reports
• Updated dependencies and improved overall UX
• Built an admin web panel from scratch using React and Ant Design for managing inspections and vehicle data
• Integrated mobile app with admin web platform and Firebase Auth

Education

Zaporizhzhia Polytechnic National University
Bachelor's Degree - Computer Science & AI (2019–2023)

Languages

• English - B1
• Ukrainian - Native