Mustafa Yildiz

Delivered SDK features on Android POS terminals, implemented P2PE encryption and certificate management with 3DES/AES for secure payment data processing and PCI compliance. Led hardware API integration for card readers, PIN pads, and NFC modules, establishing reliable communication with firmware teams. Participated in backlog refinement and sprint planning by clarifying requirements and acceptance criteria.

Contributed to the development of a BLE-powered iOS app in Swift, improving Bluetooth protocol stability for real-time snoring detection and device control. Built modular UI and data pipelines using SwiftUI, Combine, and MVVM to enable scalable, testable architecture. Designed custom communication protocols for BLE devices and implemented AWS service communication (IoT, S3, Lambda) with structured async code and decoupled service layers.

Developed iOS and Android applications, integrated with GraphQL and RPC APIs and socket-based Web3 systems for secure, real-time data exchange in decentralized apps. Released and maintained modern SwiftUI-based iOS apps, achieving a 20% increase in user engagement across crypto tools (e.g. Pay.cool+, Biswap). Built automated test pipelines using Fastlane, GitHub Actions, Appium, and Selenium, ensuring high-quality delivery. Advocated for continuous delivery and contributed to cross-platform mobile testing strategies for iOS, Flutter, and web.