Mehmet Sekercioglu

A student study portal that a million remote students of the university use.

At peak times, 30,000 concurrent users use the system. I used Go, Elixir, and Phoenix for the back end of the application.

A resource, personnel management, and content creation system internally used by an institution that offers distance education. The faculty has over one million students studying remotely, and resources are planned and created through this application in various formats like epub, HTML, and PDF. Storing metadata about all of their educational materials and payment information is done through the system. I used PHP/Laravel, MySQL, and Redis for this application.

A single sign-on application that allows users to use one password for multiple applications and switch between them seamlessly after logging in once. The system supports various identity providers, meaning users can use a Google password, their official identity provider password, or any custom identity provider to log in.

The system has two main benefits:
• Multiple identity providers can be added to any application simultaneously without dealing with each other separately.
• It supports seamlessly switching between multiple applications if needed.

I built this application using Elixir, Phoenix, and PostgreSQL. It performs well, runs inside a Docker container, and is used in multiple high-traffic applications. Also, it had more than two billion logins in three years and is still heavily used in production.

A module that converts HTML to various formats, including epub and PDF. Before converting, it pre-processes raw HTML. I wrote this app because I couldn't find high-quality epub creation libraries. This module was written in Python/Flask and runs in a Docker container. Around 2,000 thousand books have been edited and generated through this system.