# @duodevlogs on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DUpB3UPDHYd
- **Gondola URL:** https://gondola.cc/posts/61479079-duodevlogs-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/b37f23c329.jpg
- **Posted:** 2026-02-12T02:28:12.000+00:00
- **Account Owner:** Ishraq Haider Chowdhury (@duodevlogs) — https://gondola.cc/duodevlogs

## Caption

Want to become good developers?

POV: You actually learn the most used system design concepts instead of just grinding LeetCode.

Here’s what real backend & system design interviews test you on:

⸻

1️⃣ Caching
Understand cache patterns, invalidation, eviction, write-through vs write-back.

2️⃣ Load Balancing
Round robin, consistent hashing, scaling horizontally.

3️⃣ SQL vs NoSQL
When to choose relational vs document vs key-value stores.

4️⃣ Database Scaling
Vertical vs horizontal scaling, bottlenecks.

5️⃣ Database Sharding
Partitioning data to handle massive traffic.

6️⃣ Indexing
B-Trees, inverted indexes, query optimization.

7️⃣ Database Replication
Leader-follower, async vs sync replication.

8️⃣ Data Consistency
Strong vs eventual consistency. Trade-offs matter.

9️⃣ API Gateway
Single entry point for microservices.

🔟 CAP Theorem
Consistency vs Availability vs Partition Tolerance.

1️⃣1️⃣ Microservices Architecture
When to break the monolith.

1️⃣2️⃣ CDN (Content Delivery Networks)
Reduce latency globally.

⸻

If you understand these deeply,
you don’t just code.

You design systems.

⸻
Comment CAREER to get the whole dev career system (roadmaps, portfolio, ATS friendly resume, Interview guidelines and AI prompting all the way) starting from learning to code to getting hired.

Comment CODE if you want structured learning resources for this.

Comment SENIOR if you want to properly master backend + system design like a serious engineer.

Follow duodevlogs for real dev content.

#systemdesign #backend #developers #softwareengineering #coding

## Stats

- **Views:** 31,044
- **Likes:** 765
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- **Comments:** 573

## Tags

backend, softwareengineering, coding, systemdesign, developers

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