🧠 CS Core
"Master the fundamentals, and the rest will follow."
This section covers the foundational computer science knowledge that every serious software engineer should master. These concepts form the bedrock of all software systems and demonstrate a deep understanding beyond just API integrations.
Why CS Fundamentals Matter
In interviews and real-world engineering, understanding why things work is just as important as knowing how to use them. This section proves that foundation.
📚 Topics Covered
Algorithms & Data Structures
Systematic problem-solving patterns and efficient data organization.
- LeetCode patterns (Two Pointers, Sliding Window, DP, etc.)
- Core data structure implementations in Java
- Time & Space complexity analysis
System Design
Building scalable, reliable, and maintainable systems.
- High concurrency & availability patterns
- Distributed systems fundamentals (CAP, BASE)
- Load balancing & caching strategies
Database Internals
Understanding how databases work under the hood.
- MySQL indexing & query optimization
- Transaction isolation levels (ACID)
- Redis caching strategies & persistence
Network & OS
The infrastructure that powers everything.
- TCP/IP handshake, HTTP/HTTPS protocols
- Linux essentials & process management
- Memory management & concurrency
🎯 Learning Path
📖 Quick References
| Topic | Key Concepts | Interview Focus |
|---|---|---|
| Algorithms | Sorting, Searching, Graph, DP | LeetCode Medium/Hard |
| System Design | Scalability, Reliability | Senior+ Interviews |
| Database | Indexing, Transactions | Backend Roles |
| Network/OS | Protocols, Processes | Infrastructure Roles |
Start with Algorithms for coding interviews, then progress to System Design for senior positions. Database and Network knowledge will naturally integrate as you solve real-world problems.