Eleyan Saad

Senior iOS Engineer at Numero eSIM

Refactored core components from Objective-C to Swift, reducing type-related crashes by 30% and cutting onboarding time for new developers by 50%. Optimized app launch time by 40% through lazy loading, view controller lifecycle improvements, and memory management. Implemented Firebase Crashlytics monitoring and performance optimization, reducing crash rates by 25% and achieving 99.8% crash-free sessions for iOS apps.

Senior iOS Engineer at Numero eSIM

Refactored core components from Objective-C to Swift, reducing type-related crashes by 30% and decreasing onboarding time for new developers by 50%; optimized app launch time by 40% through lazy loading, lifecycle improvements, and memory management; implemented Firebase Crashlytics monitoring and performance optimization, reducing crash rates by 25% and achieving 99.8% crash-free sessions for iOS apps.

Senior iOS Engineer at CloudSource.io

Integrated OpenAI GPT models using Swift and REST APIs for intelligent email features, boosting user response efficiency by 35%. Built reusable Swift packages for OpenAI utilities, token management, and prompt tuning, accelerating product experimentation cycles by 3x. Optimized CI/CD pipeline and build architecture for iOS projects, reducing release cycle time by 25% and enabling more frequent, stable deployments.

Senior iOS Engineer at CloudSource.io

Integrated OpenAI GPT models using Swift and REST APIs for intelligent email features, boosting user response efficiency by 35%; built reusable Swift packages for OpenAI utilities, token management, and prompt tuning, accelerating product experimentation cycles by 3x; optimized CI/CD pipeline and build architecture for iOS projects, reducing release cycle time by 25% and enabling more frequent, stable deployments.

Senior iOS Engineer at Eventful Co.

Engineered an event-driven booking system for iOS using Swift and Core Data, processing 50K+ monthly reservations with idempotent payment flows, achieving a 99.7% success rate. Built a real-time availability engine using WebSocket and Redis, supporting 5K concurrent users with ~100ms latency. Reduced infrastructure costs by 35% through query optimization and intelligent prefetching, improving p95 response time to 150ms for critical iOS features.

Senior iOS Engineer at Eventful Co.

Engineered event-driven booking system for iOS using Swift and Core Data, processing 50K+ monthly reservations with idempotent payment flows achieving 99.7% success rate; built real-time availability engine using WebSocket and Redis, supporting 5K concurrent users with ~100ms latency in the iOS app; reduced infrastructure costs by 35% through query optimization and intelligent prefetching, improving p95 response time to 150ms for critical iOS features.

iOS Engineer at BULLIT CO.

Developed a secure VoIP communication platform for iOS using WebRTC and end-to-end encryption, supporting 1K+ concurrent calls. Implemented adaptive bitrate streaming for screen sharing in iOS, reducing bandwidth usage by 40% while maintaining video quality. Shipped 3 enterprise iOS applications with a 99.5% crash-free rate and 4.7+ App Store rating.