Ferdinand Torggler

DataCamp Signal™ is a web application for testing the data science skill levels of students on the DataCamp e-learning platform. It uses machine learning for adapting question difficulty throughout the test and estimating the test-takers score. I worked in a team with two other engineers, where we built the entire application as a single-page app with a front end (built with React and its latest features), a Node.js back end with NestJS as a framework and a GraphQL API for communication between the two. The single-page architecture we chose for this tool helped us achieve a smooth and pleasant user experience, leading to high test-completion rates and lots of positive feedback from our users.

An integrated development environment running in the browser, that is custom made to fit the needs of the instructors who build interactive courses on the DataCamp platform. For the first few months of the project, I was working autonomously, defining the architecture with future extensibility in mind. I chose to use React and Redux (with some additional middleware) for the app. After this initial phase, instructors started switching to this tool, and two more engineers joined my team and helped me add a lot more features until it became the center of content creation at DataCamp. With features like editing and parsing of a custom markdown-based language, modifying and timing slides, previewing exercises, uploading and managing files, persisting content on GitHub, multi-user access, and more, it solved one of the fundamental challenges in the company. Unfortunately, the software is only accessible by instructors working with DataCamp and is not publicly visible.

This project is the online shopping experience of one of Austria's largest supermarket brands (Billa), which belongs to the Rewe Group. I worked as a front-end developer on a team of three. We built a custom online shop in AngularJS and Sass. During this process, I worked closely with the back-end team to define REST APIs and the way data is transmitted. The shop is built as a single-page application in order to provide a seamless experience when adding articles to the cart and navigating through the checkout process.