The document discusses using various cloud technologies and tools for building a search engine called Seravia. It outlines using MongoDB for document storage, Sphinx for full-text search, and Amazon Web Services like EC2, S3, and EMR for scalable infrastructure and distributed computing. The architecture involves crawling data, preprocessing and analyzing it on AWS, then storing documents and search indexes across MongoDB and Sphinx to power the search engine deployed on EC2 instances behind a load balancer.