Serhii O.

Cross-Platform Mobile App Developer | Dart, Flutter | EV Charging

As a Cross-Platform Mobile App Developer (Android & iOS) with 4 years of experience in Tech, I am strongly committed to delivering sleek & user-friendly Flutter apps to my customers. My key fields of expertise are EV Charging apps, but I am open to challenges in other industries. It should be said that I also have substantial experience in IoT domain. If you need a sleek cross-platform mobile app for both Android and iOS, invite me for an interview! TECH STACK ✅ PROGRAMMING LANGUAGES, SDKs: Dart, JavaScript, Android SDK, Flutter SDK ✅ FRAMEWORKS: Flutter ✅ DESIGN PATTERNS, ARCHITECTURAL APPROACHES: BLoC, MVC, MVP, ChangeNotifierProvider ✅ DATABASES: SQLite, Apache Hive ✅ OTHER: Firebase Services(Authentication, Firestore, Realtime Database, Storage, Cloud Functions, Hosting) MY MOST RECENT APPS ✅ Water tracking app: An ability to keep track of the amount of water consumed daily and sharing it with other users. Built with Provider state management solution, uses Firebase Authentication, Firestore, Firebase Dynamic Links, Firebase Cloud Messaging. ✅Habit Tracker App: Application inspired by the Streaks app. Ability to add tasks and marking them as done to develop new habits. Uses Riverpod state management solution, saves user data locally with Hive database. ✅OCPP Compliance Testing Ensured that EV chargers met full OCPP compliance before integration into the system. Conducted extensive tests for core OCPP functionalities and advanced features like Smart Charging, Security, and Load Balancing. ✅Smart Charging Validation Tested Smart Charging functionalities, including dynamic load balancing and tariff-based charging, to ensure seamless backend integration. Evaluated charger responses under different load conditions to verify stability and efficiency. ✅Advanced Security Testing Performed penetration testing and security assessments on OCPP implementations to prevent vulnerabilities in charger-to-backend communication. Ensured secure firmware updates, encrypted connections, and authentication protocols were properly implemented. ✅Charger Manufacturer Collaboration Worked directly with charge point manufacturers to debug and improve firmware compatibility with backend. Provided detailed reports on firmware issues, ensuring manufacturers applied necessary fixes for long-term compatibility. ✅Flutter App Development & Backend Integration Joined during active development, quickly became familiar with the codebase, and started implementing new features. Integrated Firebase Cloud Messaging, Google Maps, WebSockets, and multiple payment providers for seamless user experience. ✅Google Maps Customization & Route Building Enhanced Google Maps UI by implementing custom overlay buttons, dynamic map markers, and real-time clustering. Integrated Directions API for in-app route guidance, eliminating the need for external navigation apps. ✅Real-time Data Updates via WebSockets & STOMP Implemented WebSockets & STOMP for real-time updates on charger availability and status. Ensured seamless bidirectional communication between the app and backend, preventing data delays. LANGUAGES I SPEAK Ukrainian is my native language. Besides, I have strong English skills. Most of my previous customers were English-speaking, so I am comfortable communicating in English. MY TEAM I am at ease as an individual contributor, but being a team player works best for me. So I joined Extrawest — an Upwork Top Rated Agency specializing in FinTech and Banking, Gambling and Betting, Food Ordering and Delivery, Logistics and Fleet Management, Medical Insurance and Healthcare, and special software for Electric Vehicles Charging Station networks since 2006. Having most of our resources based in Europe, we’ve been working with customers from over 20 countries (the US, Canada, Australia, most of the EU, South Africa, Singapore, Japan). Hence, it won’t be a problem for us to adjust to your timezone and working schedule. INVITE ME FOR AN INTERVIEW If you feel I’m a good fit for your project, let's discuss how I can help streamline your business’s growth! 🟩 🟩 🟩 🟩 My Agency Skills: Front-End (Frontend) Development, Back-End (Backend) Development, Full-Stack (Fullstack) Development, Mobile Development, EV Charging, Automotive, Logistics, Delivery, Food Ordering, FinTech, Banking, Healthcare, Insurance, Betting, Gambling, Data Scraping, Flutter, Dart, JavaScript (JS), TypeScript (TS), Angular, Vue.js (VueJS, Vue), React.js (ReactJS, React), Node.js (NodeJS, Node), Java, Spring, SpringBoot, Hibernate, Python, Django, Scrapy, Quality Assurance (QA), Manual Testing, Automated Testing, Selenium, UI/UX Design, User Interface (UI), User Experience (UX), Figma, Adobe Creative Cloud, DevOps, MySQL, PostgreSQL, MongoDB, Firebase, REST API, FastAPI, Docker, Amazon Web Services (AWS), Google Cloud Platform (GCP), Project Management (PM).