Rostyslav N.

Hi, my name is Rost. I build cross-platform mobile and web applications using Flutter and Firebase 5years+. I deliver fast, clean, and scalable apps for iOS, Android, and Web from a single codebase. - App Store, Play Market, Web Hosting Deploy - Google Cloud - Firebase DB - Push Notifications - App Check, Fraud Defense any of the most difficult tasks 🚀 Core Engineering Competencies State-Driven Architecture & UI Predictability Engineered predictable, memory-safe user interfaces by strictly decoupling business logic from the UI layer (using BLoC). Eliminated implicit state mutations and lifecycle memory leaks, ensuring deterministic and testable UI rendering. Cloud Infrastructure & Cost Optimization Optimized backend resource consumption and minimized cloud infrastructure costs (Firebase) by implementing aggressive request throttling, debouncing, and cursor-based pagination to prevent redundant database reads during high-frequency UI events. Resilient System Design & Edge-Case Management Designed robust application "front doors" with comprehensive handling of edge cases, race conditions, and network volatility. Implemented graceful degradation, offline-first fallback states, and secure routing to maximize user retention and app stability. Test-Driven Reliability & Regression Prevention Architected decoupled, highly testable widget trees to support rigorous automated testing environments. Prevented UI/logic regressions and accelerated time-to-market by ensuring safe, rapid refactoring cycles without compromising system integrity.