Alperen Kişi

iOS Developer

iOS Developer with 3+ years of experience building mobile applications serving millions of users globally. Track record in developing scalable, performant iOS applications using Swift, SwiftUI, and modern architectural patterns. Reduced crash rates to below 0.5% and improved app performance by 40% through systematic optimization. Experience in real-time communication systems, subscription monetization, and large-scale data handling. Passionate about clean code, continuous learning, and delivering quality user experiences.

Work Experiences

iOS Developer

TEKNASYON | Feb 2024 - Present

Working on GetContact, a leading caller ID application with millions of active users globally.

  • 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 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
  • Managed complex dependency graphs with CocoaPods and Swift Package Manager
  • Developed custom UI components using SnapKit with pixel-perfect implementation
  • Collaborated with backend team to design and integrate RESTful APIs and WebSocket connections

iOS Developer

ARTERIA | June 2021 - 2024

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
  • Participated in code reviews and provided technical guidance to team members
  • Collaborated with cross-functional teams including designers, QA, and backend engineers in Agile environment
  • Optimized app performance reducing load times by 35% and implementing efficient data caching strategies

Projects

GetContact

Mobile Application

Caller ID and spam blocking application serving millions of active users globally with 4.5+ App Store rating.

  • Implemented VoIP calling features using Agora SDK with real-time audio/video communication
  • Developed contact synchronization system handling millions of records efficiently with Core Data
  • Built spam detection algorithms and integrated machine learning models for caller identification
  • Optimized app launch time by 40% through lazy loading and background task optimization
  • Implemented push notification system with Firebase Cloud Messaging for real-time alerts
  • Ensured GDPR and privacy compliance with secure data handling and encryption

Faladdin

Mobile Application

Leading fortune-telling and astrology app with millions of downloads and premium subscription model.

  • Architected in-app purchase system with RevenueCat, managing subscription tiers and payment flows
  • Implemented AI-powered tarot card reading interface with smooth animations and gestures
  • Integrated Firebase Analytics and Crashlytics for user behavior tracking and crash monitoring
  • Built personalized horoscope delivery system with complex algorithm integration
  • Reduced crash rate to below 0.5% through systematic debugging and error handling
  • Developed offline-first architecture with data synchronization capabilities

Binnaz

Mobile Application

Full-featured e-commerce platform with advanced product discovery and seamless checkout experience.

  • Built product catalog with advanced filtering, search, and recommendation features
  • Implemented secure payment gateway integration with 3D Secure authentication
  • Developed shopping cart and wishlist functionality with real-time price updates
  • Created order tracking system with push notifications for delivery status updates
  • Optimized image loading and caching strategies reducing data usage by 35%
  • Implemented deep linking for marketing campaigns and product sharing