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Level Up Coding System Design Newsletter

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REST API Authentication Methods Clearly Explained

8 API authentication methods every developer should know.

What OpenAI’s Data Agent Teaches Us About Building Reliable AI Agents

How OpenAI built its data agent to work across 70,000 datasets.

Vector Databases Clearly Explained

The mental model that makes vector databases click.

What Netflix Live Teaches Us About Building Reliable Systems

How does Netflix stream live events without crashing?

RAG Clearly Explained

The mental model every engineer should have.

How Discord Fans Out One Message to a Million Users

A case study in fanout, bottlenecks, and the engineering decisions behind Discord's scale.

LLMs: The Essential Guide

Most engineers only see the API layer. Here's what's happening underneath.

MCP Clearly Explained

Plus: Big upgrades are coming to LUC. Vote on what you'd like to see first.

REST vs GraphQL vs gRPC

The tradeoffs behind resource-driven, query-driven, and method-driven APIs.

Service Discovery in Distributed Systems Clearly Explained

How modern systems dynamically locate healthy services as infrastructure constantly changes.

Docker vs Kubernetes

(4 min read) | The real difference that actually matters, how to decide, where teams go wrong, and more...

OAuth Clearly Explained

(4 min read) | OAuth flow, three different tokens, three different jobs, what OAuth actually solves, where OAuth systems usually break, and more

Infrastructure as Code Clearly Explained

The IaC workflow that actually works, why it matters in practice, security risks you can't ignore, and more...

Redis Clearly Explained

How Redis works under the hood, where it fits in the stack, where it shines, and when NOT to use it.

Database Indexing Clearly Explained

(4 minutes) | What indexes really do, index types, how the optimizer decides, when they help (and when they hurt), and the right mental model

Circuit Breakers: How to Stop Small Failures from Spreading

(4 Minutes) | What they are, what triggers a trip, why they help so much, observability, and when to use them (and when not to)

REST APIs Properly Explained

(4 minutes) | Constraints, trade-offs, when not to use it, and more

How SSO Actually Works

(5 minutes) | What actually happens when you click “Sign in with Google”

Hashing vs Encryption vs Tokenization

(5 minutes) | One question decides which one you should use...

Sync vs Async Clearly Explained

(5 minutes) | One design choice determines if your system blocks or flows.