Ozan Hazer

Tatilde Kirala (Vacation Rentals) is the leading villa rental marketplace in Turkey, which was built by another agency using Symfony, Vue.js, and Elasticsearch. The project got too complicated, and three other agencies, including the one that actually created the project, couldn't fix the existing problems and add new features.

Heavy refactoring was done to clean up over-engineered parts of the software, fix numerous bugs during the clean-up, and conduct various performance improvements. After the refactoring, the requested new features were added.

The hosting costs (AWS) were also unnecessarily high. After the performance improvements and better AWS configuration, the costs were reduced by 90%., while overall page load speeds were improved by around 10%.

A React Native mobile application built for the Qatar Ministry of Health helps people find sports companions around them. The purpose of the project is to encourage Qatar citizens to participate in sports. Performed all mobile UI and UX implementations.

Depo Photos is an editorial stock photography website providing photos and videos to mainstream media in Turkey. Verified professional freelance photojournalists join and upload their photos and videos to the system, and media companies buy subscriptions to access the content.

The system is still active and currently hosts over three million media with 450+ accredited professional photojournalists. The content can be searched using 20 different criteria, and the most complex query takes under one second.

The software can read and write metadata information in IPTC, EXIF, XMP, and other formats and supports hundreds of image and video formats, including RAW formats like HEIC, CR2, CR2, and NEF.

Due to privacy concerns, Bilkent University does not prefer third-party email delivery platforms to send bulk emails. This service provides an API to the developers for sending mass emails using the university's SMTP servers.

It supports load balancing across multiple SMTP servers, rate limiting, email prioritization, markdown, and HTML email templates. It utilizes Redis queues heavily. More than 60,000 emails are sent daily on average.

Timing App is a sophisticated time-tracker for Mac. I provide support for the web version of the application, fix bugs, and add features as requested. The project has very strict code-style rules and very high-quality expectations enforced by the CI/CD system.

Developed an automation system where invitations are created for the events organized by the European Union in Turkey. Invitations are sent by email, and attendance records are kept by the operators by telephone with automatic RSVP responses.