Hello, I'm
Yasin Çetin
Computer Engineer & iOS Developer
Building scalable, user-centric iOS applications with Swift, SwiftUI, and UIKit.
About Me
Get to know me briefly
I'm a Computer Engineering graduate from Trakya University (2025), specializing in iOS development. I started building SwiftUI apps in my second year of university and have been shipping projects ever since.
I've contributed to production codebases at Martı Technologies (Nasdaq: MRT), Turkey's leading micro-mobility platform, and DeFacto, a large-scale e-commerce brand with 10M+ app installs — working on SDK integrations, analytics infrastructure, and UI development.
I care about clean architecture and maintainable code. Some of my projects — including Zenjo Mahjong and ParkPing — are live on the App Store, shipped with CI/CD pipelines built on Fastlane and GitHub Actions.
I also integrate AI-assisted development tools like Claude Code and MCP into my workflow — using them to automate repetitive tasks and keep code quality consistent across projects.
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Experience
My professional work experience and internships
Contributed to Martı's production iOS app — focus on SDK integration, programmatic UI development, and performance profiling.
- Diagnosed a Dark Mode rendering issue in the map component caused by a Google Maps SDK version incompatibility; resolved it by updating the package via SPM and implementing the required dark mode support in code — maps now correctly switch appearance with the system theme.
- Embedded a third-party chatbot into the in-app support flow via WKWebView; the chatbot's active/inactive state is remotely toggled via Firebase Remote Config, allowing feature control without an app release.
- Intercepted tel: URL scheme callbacks from the chatbot's WKWebView via the navigation delegate, triggering the native Phone app for one-tap emergency calls within the support flow.
- Developed responsive user interfaces using SnapKit for programmatic Auto Layout implementation, creating clean and maintainable UI code structure.
- Contributed to performance profiling sessions using Xcode Instruments, assisting the team in identifying and resolving runtime issues.
- Profiled memory usage with Instruments to diagnose retain cycles and reduce leaks
- Researched Dynamic Island live activity integration with teammates and contributed to a technical presentation shared with the team.
Developed a SwiftUI prototype of the DeFacto iOS app as part of a Flutter-to-native migration feasibility study within the ECP Mobile team.
- Developed a SwiftUI prototype of the DeFacto iOS app as part of a Flutter-to-native migration feasibility study, applying MVVM, Repository Pattern, and Protocol-Oriented Programming.
- Built a typed API service layer from sample responses, separating data and domain layers in preparation for a production-ready architecture.
- Completed formal training in secure coding practices, Agile, and Scrum methodology.
- Collaborated with a senior engineer on a PoC report and code review sessions; attended sprint planning, retrospectives, and Agile ceremonies as part of the ECP Mobile team.
- Structured the SwiftUI prototype with Dependency Injection to enable modular testing
- Consumed RESTful APIs with async/await for the typed API layer
iOS Developer
Co-built Good Market, a B2B field sales iOS app, from scratch as part of a 2-person iOS team on a greenfield codebase.
- Co-built Good Market, a B2B field sales iOS app, from scratch as part of a 2-person iOS team — covering product catalog, cart and order flow, staff management, messaging, announcements, and financial transactions across 7 modules.
- Developed all UI screens with SwiftUI and integrated Firebase as the backend (Firestore for real-time data, Auth for login).
- Implemented role-based access control, presenting different views and permissions for manager and staff user roles.
- Took ownership of feature flows end-to-end — from initial architecture decisions to screen-level implementation — on a greenfield codebase.
Projects
Featured projects I've worked on
Zen-themed Mahjong Solitaire puzzle game with Japanese aesthetics, published on the App Store.
Real-time cryptocurrency tracker with historical price charts, built with zero third-party dependencies.
Parking-reminder iOS app with a Home Screen widget, published on the App Store.
AI-powered calorie tracking app. Snap a photo of your meal to log calories automatically.
Two-sided hair-salon marketplace connecting customers with stylists, developed as a graduation project.
Skills
Technologies and tools I use
Languages
iOS & Apple Frameworks
Architecture & Patterns
Libraries
Dev Tools
AI Tools & Workflows
CI/CD & Testing
Education
My academic background and certifications
Trakya University
Bachelor's Degree — Computer Engineering
September 2021 — October 2025
Comprehensive education in software engineering, data structures, algorithms, object-oriented programming, artificial intelligence, and computer networks.
Contact
Want to work together? Get in touch!