The blog post outlines a comprehensive guide on building a search engine using pre-trained transformer models, specifically focusing on BERT. It highlights the importance of natural language processing in modern search engines and explains the process of creating a vector-based search engine to improve search accuracy by addressing limitations of keyword-based searches. The guide details the steps involved, including loading a pre-trained model, optimizing the inference graph, creating a feature extractor, and exploring vector space using dimensionality reduction techniques like T-SNE. It further explains how to build a semantic search engine that utilizes Euclidean distance for nearest neighbor search, and it discusses the acceleration of search processes and the benefits of using tools like neptune.ai for experiment tracking. The article emphasizes the significance of similarity in document retrieval and ranking, aiming to enhance search engine performance and accuracy.