Have you ever wondered how full-text search engines such as ElasticSearch or Algolia works? Let's find out! In this talk, we will build a RESTful full-text search engine from scratch, understanding how to choose the right algorithms and data structures for accomplishing such a task. By the end of the talk, you will see how to maintain incredibly high performances while working with a massive amount of data and understand why it is so important to choose the right algorithm or data structure for accomplishing such tasks.