Hasan Talha Yazici

Software Engineer - Mollie January 2022 - Present

Worked on the web app, API and infrastructure of Thirona using Python, Django, Javascript, PostgreSQL, MySQL, AWS, Docker, Bash.
Developed/maintained a number of internal systems/tools mostly using Django, Flask, MySQL, Docker.

Worked on the RESTful APIs of the analytics and visualization services for the main product using Python, Django, Flask, MySQL, AWS, Docker, Bash. Constantly adding new features to the product and optimizing performance of these resources.
Improved the organization’s CI/CD pipeline using GitHub Actions, Terraform and several AWS services.
Built a CLI module to ease the process of setting up and using a local development environment for all the internal projects using Bash, Click, AWS CLI and Docker Compose. This module decreased the time spent by developers on building and refreshing their local development environment from 10+ minutes to 2 minutes.

Worked on a data crawling API with ETL process using Python, Tornado, Scrapy, MongoDB, PostgreSQL, Celery, Redis, AWS, Docker.
Maintained and built new features for website’s microservices such as commenting and rating service, schools data providing service. Tech stack mostly included Django and Django Rest Frameworks.

Performed discount optimization on regional sales data from across the country using K-Means clustering with Python, Pandas, Scikit-learn, NumPy, Matplotlib, and improved sales by 105% and gross profit rate by 16.8% on products with regional discounts.
Improved feedback system by developing a micro-service to analyze sentiment of customer feedback on the goods. Used Naive Bayes algorithm to classify feedback as Positive or Negative with 92,5% accuracy, precision and recall. Tech stack included Python, Flask, Javascript, Pandas, NumPy, Scikit-learn.
Worked with HR department to develop an employee churn algorithm to calculate each employee’s probability of leaving the company. Used Scikit-learn’s Gradient Boosting algorithm and achieved 89% accuracy on past employees’ labeled data.

Experienced full-stack web development for the marketplace platform using MVC architecture and the tech stack included PHP, MySQL, JQuery, HTML5, CSS3, Git, Atlassian JIRA and Bitbucket.
Developed a unique WordPress plugin for the platform’s blog using PHP for the backend and HTML5, Bootstrap, JQuery to create custom footers and in-post ads. This implementation improved the blog’s Click-Through-Rate by ~75%.
Integrated Google AMP to the blog in order to increase the readability of blog posts from mobile devices. Increased traffic to blog posts by ~25%.