Before touching microservices, Sen ensures his students understand TCP/UDP, Sockets, and Threading. His lesson on is arguably the most famous visualization on the internet for distributed sharding. He breaks down how DynamoDB and Cassandra distribute data without re-shuffling the entire cluster.
Limitations and caveats
| Feature | Gaurav Sen (DesignGurus) | Alex Xu (System Design Interview Books) | Educative.io (Grokking System Design) | | :--- | :--- | :--- | :--- | | | Video (Whiteboard style) | Text & Diagrams (Book) | Text-based Interactive Course | | Best For | Visual learners & Understanding "The Why" | Quick revision & Reference | Fast readers who like structured text | | Depth | High (Iterative approach) | High (Reference heavy) | Medium (Good overviews) | | Cost | Medium/High | Low (Cost of book) | Medium/High | gaurav sen system design
If there is one topic that defines , it is Consistent Hashing. While textbooks explain it as a mathematical circle, Gaurav explains it as a map. He visualizes placing servers on a ring and assigning keys to the nearest server. This allows you to add or remove servers without rehashing every single key—a breakthrough for distributed caching systems like DynamoDB or Cassandra. Limitations and caveats | Feature | Gaurav Sen