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Most of us use Redis like this: SET name Alice GET name It feels simple. You send a command. Redis stores something. You get the value back. But I wan…
Reverse overseas online shopping supports settlement in over ten mainstream foreign currencies, including the US dollar, euro, pound sterling, and Aus…
PDF generation is one of those things that works perfectly… until real users touch it. On localhost: npm run dev Open Chrome → print → PDF. Done. Then…
Also available in Spanish Before designing an endpoint, classify its nature. Only then choose its location. The Silent Problem There are many articles…
В каждом бэкенде рано или поздно рядом появляются id , UUID , slug , token и request_id . Все они выглядят как строки, но отвечают за разные вещи. Ког…
In Java, sorting is an important operation when working with collections such as ArrayList, LinkedList, and other data structures. For primitive data …
The Quest Begins (The “Why”) Picture this: I’m huddled over my laptop at 2 a.m., eyes glazed, watching the metrics dashboard flash red like the Death …
This module built one thing, from many angles: the container — the part of Spring that creates your objects, wires them together, and hands them out. …
Every engineering team hits this conversation at some point. Someone proposes GraphQL. Someone else says REST is fine. A third person mentions gRPC an…
Привет, Хабр! В первой части мы разобрали архитектуру pg-smart-search изнутри: параллельный Promise.race , механизм Zombie Prevention через AbortSigna…
When building high-concurrency backend services, two ecosystems dominate the conversation: Node.js and Go (Golang). If you ask the internet how they h…
In the previous article, we explored the concepts of Authentication and Authorization. We learned that: Authentication answers "Who are you?" Authoriz…
I had a write that spanned two physically separate databases. A rename that had to propagate across several tables in one database and a couple of tab…
В задаче проектирования Rate Limiter важны сразу несколько вещей: выбор алгоритма лимитирования, централизованное хранение состояния, работа через API…
We've all been there: you’re building an endpoint, and for the hundredth time, you’re typing out res.status(200).json({ success: true, data: ... }) . …
The Quest Begins (The "Why") Ever had one of those days where your API feels like it’s stuck in quicksand? I was building a simple rate‑limiter for a …
A few years ago, choosing an ID format was easy. Most of us generated a UUID, stored it in the database, and moved on. Today things are different. Mod…
A conversation between Uncle (a backend architect) and Nephew (a curious developer) about events, publishers, subscribers, Redis Pub/Sub, RabbitMQ, an…
How old tools improve the work of new (non)humans. I noticed this pattern while working through a series of backend cleanup tasks in pylint , flake8 ,…
It's much more than that. An API Gateway sits between clients and your backend services, acting as a single entry point for your entire system. Client…
I Built a Consistent Hashing Ring in Pure Python and Finally Understood How Cassandra Distributes Data I've been using Cassandra and Redis Cluster for…
I learned this the annoying way: admin panels are not configuration systems. They can become one, but not by accident. Early on, it feels harmless. So…
With the recent surge in security vulnerabilities across the Spring ecosystem in the first half of 2026, relying on scattered security validation insi…
Book: The Complete Guide to Go Programming Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in G…
Book: Decoupled PHP — Clean and Hexagonal Architecture for Applications That Outlive the Framework Also by me: Thinking in Go (2-book series) — Comple…
In this post, we'll build a practical AI-powered meal planning agent using HazelJS. This agent helps users create personalized meal plans, discover re…
Reflecting on two major technical challenges from my backend engineering internship, focusing on fault tolerance, infrastructure, and distributed arch…
A year ago I'd have told you a .env file was fine. Then we patched a CVSS 10.0 RCE in Next.js ( CVE-2025-66478 ) and spent the next two days rotating …
Webhooks are usually discussed as something your application should process automatically. A payment provider sends an event. A Git hosting service no…
In the previous article, we explored how Pydantic validates data before it enters our application. For example, if an API expects a temperature value,…