Dumitru Paraschiv

Operated observability and crash monitoring and implemented automated go/no-go release gates, improving crash-free sessions from 97.1% to 99.85% within 4 months. Architected an end-to-end In-App Purchase system (consumable and auto-renewable subscriptions) using Swift Concurrency and StoreKit 2 with strict backend validation. Shipped 23 consecutive App Store releases with zero rejections by resolving guideline edge cases with App Review. Improved responsiveness for a token-based subscription model supporting concurrent WebSocket and SSE connections, adding backpressure handling to eliminate UI stutter under load; reduced p95 update latency by 38% and cold-start time by 45% (5.3s to 2.9s). Refactored a legacy UIKit/RxSwift monolith into SPM modular architecture and incrementally migrated to SwiftUI under state-driven UDF, cutting CI/CD build times by 50% (24m to 12m). Integrated Claude and Gemini into daily development for AI-assisted code review and architecture trade-off exploration;

Reduced main-thread hangs and watchdog terminations by 45% using Instruments-driven profiling across memory and CPU usage. Introduced a testing pyramid and lightweight QA dashboards across legacy MVP and MVVM codebases, cutting time-to-triage by 60% and mean time to repair (MTTR) by 40%.

Delivered full SDLC for 7 native iOS MVPs for independent clients, building scalable MVVM-C architectures and polished, animation-driven UX. Maintained an average 8-week cycle time from kickoff to delivery.