Backend

Backend Developer Roadmap - https://roadmap.sh/backend

Testing Strategies in a Microservice Architecture - https://martinfowler.com/articles/microservice-testing/

Data Structures for Data-Intensive Applications: Tradeoffs and Design Guidelines - https://cs-people.bu.edu/mathan/publications/fnt23-athanassoulis.pdf

Designing Data-Intensive Applications - https://github.com/keyvanakbary/learning-notes/blob/master/books/designing-data-intensive-applications.md