Shameless plug, but hopefully relevant enough: my directory and search engine for personal blogs[1] indexes over 1000 RSS feeds, and naturally lots of them are about engineering and software development. Full-text search is implemented with Typesense, and there are also "related" recommendations for each post, example [2].
1. https://minifeed.net/
2. https://minifeed.net/items/n1HZYMDEKyra