Олег

OLEH KHALIEIEV
Full-Stack Flutter Developer

EXPERIENCE SUMMARY

Full-Stack Flutter Developer 08/2024 - Present Full-Stack Flutter Developer with 4
years of software development
TeGem experience, including 2 years in
All-in-one Telegram marketing platform for automating ad campaigns, real-time analytics, commercial production-grade projects.
and channel management. Currently working on TeGem — a
Telegram marketing SaaS contributing
Mobile Development Flutter & Dart) to everything from the Flutter mobile app
• State & Architecture: Architected mobile application state management using Provider to the React frontend and Python
and control combined with custom controller patterns, adhering to Clean Architecture backend. I have a strong analytical
principles. mindset and enjoy solving complex
• UI/UX Engineering: Translated complex Figma layouts into pixel-perfect, highly problems, writing clean code, and
responsive custom Flutter widgets with smooth micro-animations. designing maintainable architectures.
• Feature Integration: Built a robust dynamic theming engine and a multi-language Looking for a software engineering role
localization framework supporting global user settings. where I can apply my versatile skills,
• Networking & WebViews: Integrated native WebViews with custom JavaScript injection collaborate with crossfunctional teams,
Telegram Login Widget, customer support widgets) and implemented a secure and build high-impact products.
networking layer using Dio with request interceptors and token auto-refresh logic.

Web Frontend React, TypeScript)
SKILLS
• Financial Features: Developed the entire balance management and billing UI Wallet,
Stripe-based Deposit, and Withdrawal flows) with strict error handling and real-time state React TypeScript JavaScript HTML5
synchronization.
CSS3/Tailwind CSS Flutter Dart
• Modular Frontend: Decomposed legacy monolithic UI pages into clean, reusable React
components Vite-based), introducing client-side sorting, filtering, and pagination. Riverpod Provider Bloc control Dio

AutoRoute GoRouter Hive
Backend & Automation Node.js, Python, FastAPI, Telethon)
• REST API & Database: Maintained and extended Express.js REST APIs and database SharedPreferences WebView Freezed
queries using Drizzle ORM PostgreSQL , implementing safe transaction-level workflows
for budgeting and platform settings. json_serializable Node.js Express.js
• API Testing & Quality: Authored integration/unit tests for key backend controllers (e.g.,
Python FastAPI Telethon REST API
transaction management) to ensure financial calculation accuracy.
• Telegram Automation: Developed asynchronous Python microservices using FastAPI and WebSockets GraphQL Stripe API
Telethon for automated Telegram operations with proxy rotation, connection failover, and
startup channel verification. OAuth 2.0 JWT/Auth PostgreSQL
• Error Tracking: Configured Sentry/Bugsink middleware and logging for production error
tracking, enabling rapid debugging of API communication failures. Firebase Docker Git GitHub GitLab

Postman mocktail workmanager
Mentorship & Process
S3/MinIO Clean Architecture SOLID
• Participated in code reviews, candidate screening, coding assessments, and mentoring
junior developers to streamline onboarding. OOP MVC MVVM Figma

EDUCATION LANGUAGES

Bachelor Software Engineering 2019 - 2023 English Intermediate
Kharkiv national university of radio electronics Kharkiv, Ukraine
Ukrainian Native
Master Software Engineering 2023 - 2025
Russian Native
Kharkiv national university of radio electronics Kharkiv, Ukraine

FIND ME ONLINE

Telegram Email
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https://t.me/OlehKhalieiev [відкрити контакти](див. вище в блоці «контактна інформація»)

Llinkedin GitHub
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[відкрити контакти](див. вище в блоці «контактна інформація») https://github.com/Khaleieiv
khalieiev-10152624b/