Alperen Kişi

Working on Getcontact, a leading caller ID app with millions of active users, and Call.io, an AI-powered VoIP calling application.

• Developed high-performance iOS features using Swift and SwiftUI with MVVM architecture
• Implemented real-time VoIP communication system using Agora SDK serving millions of calls daily
• Architected complete VoIP calling system for Call.io using CallKit, PushKit, and Linphone SIP integration
• Built AI-powered assistant with streaming WebSocket communication and real-time response handling
• Developed subscription management system using StoreKit 2 with paywall and premium features
• Architected contact synchronization engine handling large-scale data operations with Core Data and Realm
• Built reactive data flows with RxSwift for complex user interactions and state management
• Optimized application performance achieving 40% faster launch times and reduced memory footprint
• Mentored junior developers on iOS best practices, code quality standards, and architectural patterns

Developed high-traffic applications including Faladdin and Binnaz with millions of downloads.

• Developed subscription-based revenue model with RevenueCat managing payment flows and subscription tiers
• Built scalable e-commerce platform with secure payment processing and 3D Secure integration
• Implemented networking layer using Alamofire and URLSession with retry mechanisms and caching
• Reduced application crash rate to below 0.5% through comprehensive error handling and monitoring
• Integrated Firebase suite (Analytics, Crashlytics, Cloud Messaging) for user insights and engagement
• Mentored junior iOS developers through code reviews, pair programming, and knowledge sharing sessions
• Optimized app performance reducing load times by 35% and implementing efficient data caching strategies