Johannes Haberlah

[paused from 04/25 until 07/25 for internship] - Developed a scalable push notification microservice for ZDF, triggering notifications to a large user base (TypeScript, Node.js). - Developed a new backend service for the ZDFtivi native apps, supporting a user base indicated by over 1 million downloads (Kotlin, Spring Boot) - Developed a new booking microservice for TUI Cruises (PHP, Symfony); maintained existing core backend service

- Designed, developed, launched, and maintained a microservice-based course platform for medical course providers, managing the complete project lifecycle as a freelancer (Scala, Java, Spring Boot, GraphQL, RabbitMQ) - Designed, developed, and launched an online platform (booking, management, planning) for a German first aid course provider (Java, Spring Boot); additionally provided consulting and created Google Ads campaigns, resulting in a major increase in sales

- Designed & developed a VideoChat client application for large car dealerships, managing the full project lifecycle (C#, Google Firebase Realtime) - Developed a prototype of a platform leveraging AI (Google Cloud AutoML) to automatically generate videos for used car listings, closely working together with the largest German car dealerships (Java, Python)

- Independently developed a comprehensive company-wide style guide to standardize object-oriented coding practices - Collaborated on the development of a major CRM software system (C#, .NET) - Independently designed, developed, and deployed an internal task management platform (PHP, HTML, CSS) - Analyzed and profiled the performance of multiple database management systems (MS-SQL, MySQL, MariaDB) - Independently maintained a critical internal time tracking tool (C#, WPF, SQL)