Humidifier cross-border multi-currency auto-sync rate calibration tech
Reverse overseas online shopping supports settlement in over ten mainstream foreign currencies, including the US dollar, euro, pound sterling, and Aus…
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Why PDF generation breaks in production (and why localhost lies)
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…
[EN] How to Organize a REST API Tree to Survive Time (and Org Chart Changes)
Also available in Spanish Before designing an endpoint, classify its nature. Only then choose its location. The Silent Problem There are many articles…
ID, token, UUID и slug: в чём разница и почему их нельзя мешать
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…
Comparable vs Comparator in Java
In Java, sorting is an important operation when working with collections such as ArrayList, LinkedList, and other data structures. For primitive data …
Rate Limiting Like a Jedi: Mastering the Token Bucket with Redis
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 …
Recap — M0 Foundations
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. …
REST vs GraphQL vs gRPC — Which One Should You Actually Use?
Every engineering team hits this conversation at some point. Someone proposes GraphQL. Someone else says REST is fine. A third person mentions gRPC an…
pg-smart-search: Путь от 8 секунд до 40 мс — Часть 2. Масштабирование до миллиона строк и производственная архитектура
Привет, Хабр! В первой части мы разобрали архитектуру pg-smart-search изнутри: параллельный Promise.race , механизм Zombie Prevention через AbortSigna…
The Thread Battle: Go Concurrency vs. Node.js Event Loop from First Principles
When building high-concurrency backend services, two ecosystems dominate the conversation: Node.js and Go (Golang). If you ask the internet how they h…
Redis Isn't Just a Cache: 14 Use Cases (System Design)
You're probably using Redis for one job. There are 13 more, and a few of them work in ways that surprised me even after years of using it. I just publ…
FastAPI for AI Engineers - Part 6: JWT Authentication in FastAPI
In the previous article, we explored the concepts of Authentication and Authorization. We learned that: Authentication answers "Who are you?" Authoriz…
Your Hand-Rolled Two-Phase Commit Between Two Databases Isn't Atomic
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…
[Перевод] System Design: проектируем Rate Limiter, ограничитель запросов
В задаче проектирования Rate Limiter важны сразу несколько вещей: выбор алгоритма лимитирования, централизованное хранение состояния, работа через API…
Stop Writing Boilerplate API Responses: Meet BaR-js
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: ... }) . …
Indexing: The Force Awakens in My Rate Limiter Quest
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 …
UUID vs ULID vs NanoID: Which Identifier Should You Use in 2026?
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…
Event-Driven Architecture: Uncle Explains Like You're Five 👦👨🦳
A conversation between Uncle (a backend architect) and Nephew (a curious developer) about events, publishers, subscribers, Redis Pub/Sub, RabbitMQ, an…
Not Every Lint Warning Is Cosmetic
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 ,…
Most developers think an API Gateway is just a reverse proxy.
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 Built a Consistent Hashing Ring in Pure Python and Finally Understood How Cassandra Distributes Data I've been using Cassandra and Redis Cluster for…
Admin Panels Are Not Configuration Systems
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…
Securing Financial APIs in 2026: Implementing Global Request Interceptors and Automated Audit Trails in Spring Boot
With the recent surge in security vulnerabilities across the Spring ecosystem in the first half of 2026, relying on scattered security validation insi…
Struct Embedding in Go: Composition That Bites When You Reach for Inheritance
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…
Translate Infrastructure Errors at the Adapter, Not in Your Domain
Book: Decoupled PHP — Clean and Hexagonal Architecture for Applications That Outlive the Framework Also by me: Thinking in Go (2-book series) — Comple…
A Meal Planner & Grocery Shopping Agent in Typescript with HazelJS
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…
Beyond the Happy Path: Lessons in Resilience and Distributed State
Reflecting on two major technical challenges from my backend engineering internship, focusing on fault tolerance, infrastructure, and distributed arch…
Encrypt your .env with AWS KMS: Secrets that never touch process.env
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 …
When you just need to inspect a webhook before writing code
Webhooks are usually discussed as something your application should process automatically. A payment provider sends an event. A Git hosting service no…
FastAPI for AI Engineers - Part 5: Authentication vs Authorization (And Why Most Beginners Confuse Them)
In the previous article, we explored how Pydantic validates data before it enters our application. For example, if an API expects a temperature value,…