Using Contributions as Case Studies

# Case Study: [Feature Name]
 
## Problem
[What was the issue?]
 
## Challenge
[Why was it hard?]
 
## Solution
[How you solved it]
 
## Results
[What changed?]
 
## Learnings
[What did you learn?]
 
[Link to PR]

# Case Study: Caching Layer Implementation
 
## Problem
Post API was returning 10,000+ queries, 
causing 8-second page loads.
 
## Challenge
Cache invalidation in distributed system.
Needed to handle concurrent updates.
 
## Solution
Implemented Redis with:
- 5-minute TTL for consistency
- Event-based invalidation on writes
- Fallback to database
 
## Results
- 80% hit rate achieved
- 90% latency reduction (8s → 0.8s)
- Handling 3x user load
 
## Learnings
- Distributed cache complexities
- Performance monitoring importance
- Trade-offs between consistency/speed
 
[Link: github.com/...]