Junior Software Developer — Flutter · PHP · Python

Self-taught Junior Software Developer building end-to-end, working applications with Flutter, PHP, and Python. Completed a technical internship at Turkey's Social Security Institution (SGK), integrating barcode-based asset-assignment hardware with internal enterprise systems.

Independently, I design production-structured projects with encrypted local storage, SQL-injection-safe database access, CSRF protection, automated test suites, and CI/CD pipelines — a security-conscious approach that's uncommon at the junior level.

name: Mert Demir
role: Junior Software Developer
location: İstanbul, Türkiye 🇹🇷

focus:
  - Mobile apps (Flutter / offline-first)
  - Secure backend systems (PHP)
  - Data & automation (Python)

security_practices:
  - SQLCipher / encrypted local storage
  - PDO prepared statements (SQL-injection safe)
  - CSRF protection & CSP headers
  - Row-level locking for concurrency safety
  - Audit logging

currently_learning:
  - Software architecture & design patterns
  - DevOps & cloud technologies

goal: >
  Build scalable, secure, and maintainable software.

Diller: Dart, PHP, Python, JavaScript, C#, HTML5, CSS Framework'ler: Flutter, Riverpod, go_router Veritabanları: SQLite, Drift, SQLCipher, MySQL/MariaDB, SQL Server DevOps & Test: GitHub Actions, Dependabot, Git, flutter_test, mocktail, PHPUnit, pytest Data / ML: TensorFlow, Streamlit, YOLO, OpenCV

Flutter Dart SQLCipher

• Database-level encryption (SQLCipher) using a 256-bit key generated and stored via flutter_secure_storage — no secrets embedded in code
• Rule-based reminder-time suggestion engine based on recent dosing behavior
• 48 source files covered by 21 automated tests; CI via GitHub Actions + Dependabot

PHP 8.1 MySQL PHPUnit

• Prevented stock race conditions on concurrent sales using row-level locking (SELECT ... FOR UPDATE)
• Eliminated SQL-injection risk by routing all DB access through PDO prepared statements
• Built an audit-log service; modeled currency as integer kuruş to avoid rounding errors; backed by 25 automated tests including sales/refund integration tests

Flutter Dart Drift Riverpod

• Layered architecture (app/core/data/features/shared) using Riverpod + go_router
• Type-safe SQL layer over SQLite via Drift; PDF/Excel export and optional biometric authentication
• GitHub Actions pipeline running format, analyze, coverage-tested runs, and debug APK builds on every push

Software Development

• ✅ Flutter ile Mobil Uygulama Geliştirme
• ✅ Dart Programlama Dili
• ✅ Sıfırdan İleri Seviye Python Programlama
• ✅ C# ile Programlama
• ✅ HTML5 ile Web Geliştirme
• ✅ CSS Temelleri
• ✅ Versiyon Kontrolleri: Git ve GitHub

Data Science & Machine Learning

• ✅ Veri Bilimi için Python ve TensorFlow
• ✅ Makine Öğrenmesinin Matematiksel Temelleri

Databases

• ✅ Her Yönüyle SQL Server

Foundations & Security

• ✅ Bilgi Teknolojilerine Giriş
• ✅ Adli Bilişim

Intellectual Property

• ✅ Patent ve Faydalı Modellerin Korunması
• ✅ Markaların Korunması

Inventory & Asset Tracking Systems Intern — Social Security Institution (SGK), İstanbul Sep 2025 – Jun 2026 Supported integration of barcode-printing hardware with SGK's internal asset-tracking systems; worked with the internal stock management program used to assign and track institutional equipment.