Olcay Duzgun - Portfolio

💰

Personal Finance Tracker

You can drag

📝

Blog & CMS Platform

You can drag

📱

Secure Auth Framework

You can drag

🔬

Algorithm Comparisons

You can drag

⚡

Advanced Algorithms

You can drag

📊

Pandas Spreadsheet Analyzer

You can drag

📋

Task Management API

You can drag

🌐

Uptime Monitor ("İnci")

You can drag

Information about: Personal Finance Tracker

💰

Personal Finance Tracker

Olcay Duzgun

A full-stack financial engine featuring real-time data synchronization and automated expense categorization.

▶ ✨ Key Features:

📊 Real-time expense tracking with intelligent categorization algorithms

💵 Live market integration for forex and gold price monitoring

🎯 Objective-driven savings tracking with predictive milestones

📈 Dynamic analytics and trend visualization using Chart.js

💱 Automated multi-currency conversion with historical tracking

🔔 Event-driven notification system for budget thresholds

📱 Optimized responsive architecture with Cross-platform support

🔐 Enterprise-grade authentication and AES-256 data encryption

▶ 🛠️ Technologies Used:

ReactNode.jsExpressMongoDBTailwind CSSChart.js

💻 View on GitHub

Information about: Blog & CMS Platform

📝

Blog & CMS Platform

Olcay Duzgun

Scalable content management system with role-based access control and SEO-optimized rendering.

▶ ✨ Key Features:

✍️ Markdown-integrated rich text editor with asset management

👥 Granite-solid RBAC (Role-Based Access Control) system

💬 Asynchronous comment threading with moderation workflows

🏷️ Dynamic taxonomy system for advanced content filtering

🔍 Performance-tuned SEO with automated metadata generation

📊 Internal analytics dashboard for content engagement metrics

🎨 Modular theme architecture for rapid UI prototyping

🚀 Django-powered back-office for streamlined administration

▶ 🛠️ Technologies Used:

DjangoPythonPostgreSQLBootstrapHTML/CSS

💻 View on GitHub

Information about: Secure Auth Framework

📱

Secure Auth Framework

Olcay Duzgun

Android security implementation focusing on encrypted local persistence and synchronized session management.

▶ ✨ Key Features:

🔐 Implementation of encrypted shared preferences and password hashing

✅ Reactive form state management with real-time validation

🎨 Material Design 3 architecture for scalable UI components

💾 Local-first data synchronization using Room Persistence Library

📧 Cryptographically secure password recovery workflows

🌐 RESTful API integration with OAuth2 compliance

🔄 Automated JWT token rotation and session persistence

📱 Adaptive layout system for diverse Android form factors

▶ 🛠️ Technologies Used:

KotlinAndroid SDKMaterial DesignRoom Database

💻 View on GitHub

Information about: Algorithm Comparisons

🔬

Algorithm Comparisons

Olcay Duzgun

In-depth analysis and performance comparison of fundamental algorithms.

▶ ✨ Key Features:

📚 Spell checker implementations: Linear List, BBST, Trie, Hash Map

🔍 Pattern matching algorithms: Brute-Force, Sunday, KMP, Boyer-Moore

⏱️ Comprehensive performance benchmarking with time complexity analysis

📊 Visual comparison charts and statistical data

💡 Detailed documentation with algorithm explanations

🧪 Extensive test cases with edge case coverage

📈 Memory usage profiling and optimization suggestions

🎓 Educational resource for understanding algorithm efficiency

▶ 🛠️ Technologies Used:

C++Data StructuresAlgorithmsPerformance Analysis

💻 View on GitHub

Information about: Advanced Algorithms

⚡

Advanced Algorithms

Olcay Duzgun

Collection of optimized algorithm implementations and problem-solving techniques.

▶ ✨ Key Features:

🚀 High-performance implementations using C++ STL

🧠 Advanced data structure manipulation and optimization

🔧 Template-based generic programming for reusability

📝 Comprehensive inline documentation and usage examples

✅ Unit tests with multiple test scenarios

⚙️ Time and space complexity analysis for each algorithm

🎯 Real-world problem applications and use cases

📚 Best practices and coding standards demonstration

▶ 🛠️ Technologies Used:

C++STLOptimizationTesting

💻 View on GitHub

Information about: Pandas Spreadsheet Analyzer

📊

Pandas Spreadsheet Analyzer

Olcay Duzgun

A Flask + Pandas tool to upload, explore, clean, and analyze CSV/Excel data.

▶ ✨ Key Features:

📥 Upload your CSV/Excel or use bundled sample dataset

🔎 Raw data exploration: preview, shape, columns, and numeric summary

🧹 Cleaning: remove duplicates, standardize column names, fix numeric types

📈 Analysis: top authors, high-rated books, genre performance, yearly distribution

🗂 Flexible expected columns with sensible defaults and mapping

▶ 🛠️ Technologies Used:

FlaskPythonPandasJinja2

💻 View on GitHub

Information about: Task Management API

📋

Task Management API

Olcay Duzgun

A robust FastAPI-based task management system with secure authentication and Docker integration.

▶ ✨ Key Features:

🔐 Secure User registration and login powered by JWT authentication

📋 Efficient CRUD operations for task management

🐳 Containerized development environment with Docker Compose

📚 Interactive API documentation with Swagger UI (OpenAPI)

💾 Persistent storage using SQLite database

🧪 Automated testing suite with Pytest

▶ 🛠️ Technologies Used:

PythonFastAPIDockerSQLitePydantic

💻 View on GitHub

Information about: Uptime Monitor ("İnci")

🌐

Uptime Monitor ("İnci")

Olcay Duzgun

A professional, distributed system to monitor website uptime, track incidents, and calculate availability statistics.

▶ ✨ Key Features:

🌐 Distributed Monitoring with a scalable worker system

🚨 Automatic Incident Tracking and recovery detection

🔐 Secure authentication using JWT and bcrypt hashing

📊 High-precision analytics for 24-hour uptime calculation

🛡️ Production-ready architecture with Nginx rate limiting

🚀 Asynchronous design for optimal performance and scalability

▶ 🛠️ Technologies Used:

PythonFastAPIDockerNginxAsyncio

💻 View on GitHub

Notes

📌 A Little Note...

Hey there! 👋

Welcome to my digital space! This portfolio was crafted with passion, lots of coffee ☕, and a sprinkle of creativity ✨

I believe that great software is built by people who care. Every line of code here represents a story, a challenge overcome, and a lesson learned.

Fun fact: I debug with print statements and I'm not ashamed to admit it! 😄

If you're reading this, you're probably someone who appreciates the little details. Let's build something amazing together! 🚀

- Olcay

About Me

Olcay Düzgün

Full-Stack Engineer & Problem Solver

I specialize in architecting scalable distributed systems and building high-performance web applications. With a focus on technical excellence and lean development, I bridge the gap between complex business logic and intuitive user experiences. I don't just write code; I build solutions that last.

🚀 Core Competencies

Designing robust API architectures, optimizing database performance, and integrating machine learning models into production environments. I prioritize maintainability, security, and developer experience (DX) in every codebase I touch.

🎯 Focus Areas

Distributed Systems API Design Performance Optimization Cloud Native Architecture Product Engineering

🛠️ Tech Stack

React Node.js Python Django MongoDB PostgreSQL Kotlin Android C++ TypeScript

🤝 Let's Connect

🔗 LinkedIn / Olcay Duzgun

📌 A Little Note...

Olcay Düzgün

🚀 Core Competencies

🎯 Focus Areas

🛠️ Tech Stack

🤝 Let's Connect

Email Me