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Practical deep dives into AWS, system design, data modeling, and building reliable software that actually scales.

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How to Design a Rate Limiter That Actually Works at Scale
System Design#rate-limiting#redis

How to Design a Rate Limiter That Actually Works at Scale

Rate limiting looks simple - until you deploy it across multiple servers and it starts failing silently. This article covers what breaks in production and how to fix it.

Raunak Gupta
28 min · Updated 2 days ago
Caching Strategies That Work (And When They Fail)
System Design#caching#redis

Caching Strategies That Work (And When They Fail)

Caching improves performance - until it starts serving stale data or becomes your biggest bottleneck. This article covers the real decisions you'll face in production.

Raunak Gupta
32 min · Updated 2 days ago

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4 articles
Why Your Database Indexes Are Not Working (And How to Fix Them)
Databases#sql#performance

Why Your Database Indexes Are Not Working (And How to Fix Them)

You added an index. Your query is still slow. This article covers the debugging mindset - why indexes fail in real systems, how to diagnose the problem, and how to fix it.

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Raunak Gupta·Mar 22·30 min
How to Design a Rate Limiter That Actually Works at Scale
System Design#rate-limiting#redis

How to Design a Rate Limiter That Actually Works at Scale

Rate limiting looks simple - until you deploy it across multiple servers and it starts failing silently. This article covers what breaks in production and how to fix it.

Read more

Raunak Gupta·Mar 22·28 min
Caching Strategies That Work (And When They Fail)
System Design#caching#redis

Caching Strategies That Work (And When They Fail)

Caching improves performance - until it starts serving stale data or becomes your biggest bottleneck. This article covers the real decisions you'll face in production.

Read more

Raunak Gupta·Mar 22·32 min
SQS vs Kafka: When to Use What in Real Systems
System Design#aws#kafka

SQS vs Kafka: When to Use What in Real Systems

Both SQS and Kafka solve similar problems - until your system scales and the differences start to hurt. This article covers when each one breaks and how to make the right call.

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Raunak Gupta·Mar 22·35 min
TechUnfiltered.dev | System Design, AWS & Backend Engineering Deep Dives