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YusufEnesKarahan/README.md

Yusuf Enes Karahan

Backend Software Engineer specialized in PHP & Laravel. Building robust SaaS applications, modular web systems, and modern mobile solutions.

About Me

I am a software engineering graduate focused on backend development. My primary expertise lies in PHP and Laravel, where I build structured backend systems using Clean Architecture, strict typing, and modular SaaS concepts.

In addition to backend engineering, I have hands-on experience in React Native (Expo) mobile development, integrating AI APIs (such as Gemini and Vision models), and implementing security best practices like proxying sensitive keys and enforcing database isolation. I focus on writing clean, self-documenting code supported by comprehensive deployment guides and test suites.

Tech Stack

  • Languages: PHP (8.4), TypeScript, Node.js, Python, SQL
  • Backend: Laravel (12), Express.js, REST APIs, Clean Architecture / DDD
  • Mobile & AI: React Native, Expo, Gemini API, Google Vision API, Tesseract OCR
  • Databases & Services: MySQL, PostgreSQL, SQLite, Redis, Firebase Firestore
  • Practices: Strict Typing, PHPStan, PHPUnit, CI/CD, Database Isolation (SaaS)

Featured Projects

🏫 Dershane ERP

  • Description: Multi-edition Education ERP & SaaS platform deployed on a single codebase with dynamic Feature Flags.
  • Core Stack: Laravel 12 (PHP 8.4 Strict Types), PHPStan (max level), PHPUnit, Blade, AlpineJS.
  • Engineering Achievement: Designed a Clean/DDD structure decoupling domain logic from MVC controllers, complete with modular RBAC guards.

🏥 Klinik SaaS

  • Description: Multi-clinic management SaaS featuring transactional database isolation and client limit controls.
  • Core Stack: Laravel 12, MySQL, Laravel Database Queue, Redis.
  • Engineering Achievement: Coded a secure step-by-step Web Installation wizard that self-tests system requirements and dynamically builds databases.

🎓 Akademik Asistan

  • Description: React Native student organizer app with OCR document scanning and AI-powered task automation.
  • Core Stack: React Native (Expo), Node.js (Express Proxy), Firebase Firestore, Gemini API.
  • Engineering Achievement: Designed a cloud-function API credentials proxy gateway to protect Gemini/Google Calendar API keys from client exposure.

🛠️ AI Task Orchestrator

  • Description: VS Code extension translating goals into subtasks and generating optimized prompts for AI models.
  • Core Stack: TypeScript, VS Code Extension API, Webview (HTML5/JS).
  • Engineering Achievement: Implemented an IPC messaging protocol between Webview UI and VS Code host alongside a workspace metadata scanner.

🍺 Promil Takip

  • Description: Scientific Blood Alcohol Content (BAC) tracking mobile app with 6 sensor-driven sobriety test games.
  • Core Stack: React Native, Expo, Shopify Skia, Android Native Widgets, expo-sensors.
  • Engineering Achievement: Constructed 4 native Android screen widgets synchronized using SharedPreferences and gyroscope sensor controls.

🚗 Rent A Car

  • Description: Fleet inventory management and booking script with licensing validation locks.
  • Core Stack: Laravel, PHP 8.4, SQLite, Bootstrap CSS.
  • Engineering Achievement: Built a dynamic calendar booking collision checker resolving date conflicts inside isolated service classes.

GitHub Stats

Yusuf's GitHub Stats Top Languages

Current Focus & Learning

  • Systems Scaling: Microservices deployment with Docker.
  • Testing Pipelines: Advanced mock setups and CI/CD automation with GitHub Actions.
  • API Management: OAuth2/OpenID integration and system scalability.

Contact

Pinned Loading

  1. dershane dershane Public

    A production-grade Educational ERP and SaaS platform built with Laravel 12 utilizing Domain-Driven Design (DDD), custom RBAC permissions, strict typing, and dynamic Feature Flags.

    PHP

  2. klinik klinik Public

    Multi-clinic SaaS platform with resource isolation, async database queue processing, and a custom web setup wizard for automatic database and administrative setup.

    Blade

  3. Akademik_Asistan Akademik_Asistan Public

    React Native student dashboard app with automated Google Calendar sync and secure Gemini AI integration via a Node.js API credentials proxy.

    JavaScript

  4. AI_Task__Orchestrator AI_Task__Orchestrator Public

    VS Code extension for planning development workflows. Translates goals into subtasks and drafts optimized prompts for Cursor, Claude, Gemini, and Codex.

    TypeScript

  5. Promil_Takip Promil_Takip Public

    Real-time BAC calculation app implementing Widmark/Watson formulas, featuring custom Android Home Widgets and Shopify Skia data visualizations.

    JavaScript

  6. rent_a_car rent_a_car Public

    Car rental management system built with Laravel. Features automatic booking date-conflict checks, licensing clients, and admin logging modules.

    Blade