- ποΈ Data Structures & Algorithms (AVL, RB-Tree, Segment Tree, Graphs)
- βοΈ Systems Design (Distributed, Event-Driven, Microservices)
- π Concurrency / Multithreading
- π¦ Memory Management & Performance Optimization
- π Complexity Analysis & Algorithmic Tradeoffs
- REST / gRPC API Architecture
- Auth Systems (JWT, OAuth2, Session)
- WebSockets / Real-time Systems
- Microservice Decomposition
- Message Queues (Kafka, Redis Streams)
- Load Balancing & Horizontal Scaling


