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# backend

Desenvolvimento do lado do servidor, APIs, bancos de dados e logica de negocios.

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Idempotency Keys: The One API Pattern That Prevents Duplicate Charges (and Worse)

Idempotency Keys: The One API Pattern That Prevents Duplicate Charges (and Worse)

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3 min read
I Built a Cache Engine from Scratch in Python — and O(1) LFU Eviction Is Sneakier Than LRU

I Built a Cache Engine from Scratch in Python — and O(1) LFU Eviction Is Sneakier Than LRU

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7 min read
How I Am Building an AI Meeting Assistant in ASP.NET Core (And Avoided Timeout Nightmares)

How I Am Building an AI Meeting Assistant in ASP.NET Core (And Avoided Timeout Nightmares)

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3 min read
Fortifying the User Interface: Frontend Security Best Practices

Fortifying the User Interface: Frontend Security Best Practices

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6 min read
Environment Variables in Node.js: The Complete Guide (2026)

Environment Variables in Node.js: The Complete Guide (2026)

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5 min read
Building a net/http Middleware Chain From Scratch in Go

Building a net/http Middleware Chain From Scratch in Go

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6 min read
Python While Loop Practice: Multiples, Divisors, Count of Divisors & Prime Numbers

Python While Loop Practice: Multiples, Divisors, Count of Divisors & Prime Numbers

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3 min read
Multi-currency billing for global MVNOs: a deep dive

Multi-currency billing for global MVNOs: a deep dive

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5 min read
I Built a Redis Clone from Scratch in Node.js — RESP, Persistence, Replication, Pub/Sub and Transactions

I Built a Redis Clone from Scratch in Node.js — RESP, Persistence, Replication, Pub/Sub and Transactions

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7 min read
Before you build search with Elasticsearch, decide this first

Before you build search with Elasticsearch, decide this first

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5 min read
TryParse Looks Like a Small Utility Method — Until You Realize It Prevents Entire Classes of Production Failures

TryParse Looks Like a Small Utility Method — Until You Realize It Prevents Entire Classes of Production Failures

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5 min read
.NET Quizzes and Tiny Console Projects Look Beginner-Level — Until You Realize They Are Quietly Training You to Think Like a Systems Engineer

.NET Quizzes and Tiny Console Projects Look Beginner-Level — Until You Realize They Are Quietly Training You to Think Like a Systems Engineer

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5 min read
Day 39 of Learning MERN Stack

Day 39 of Learning MERN Stack

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2 min read
My Tests Required a Running Database. Interfaces Fixed That.

My Tests Required a Running Database. Interfaces Fixed That.

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7 min read
41/60 Days System Design Questions

41/60 Days System Design Questions

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1 min read
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