The provider timed out after committing
Your HTTP client raises ETIMEDOUT on POST /charges . Something has to be written to the database, the status column has two useful values, and so th…
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Почему найти хорошего backend-разработчика стало сложнее — и дело не в дефиците кадров
Если смотреть только на количество откликов, может показаться, что искать IT-специалистов стало проще: резюме на рынке много, а конкуренция за вакан…
Building a Data Pipeline for Real Estate Feasibility Analysis
Real estate feasibility analysis is often treated as a financial modeling problem, but the financial model is only as reliable as the data behind it…
How a Timeout Can Charge Your Customer Twice (And How to Stop It in Laravel)
A customer attempts a payment. The request safely reaches your server, and the transaction is performed successfully. Then, while the response is be…
HLD: Instagram Feed
Design a photo-sharing platform where users post photos and see a feed of photos from people they follow. 1️⃣ Clarify Requirements Functional Requir…
Stop Choosing Between BM25 and Vector Search: Implement Hybrid Search with RRF
Combine dense embeddings and sparse keyword search using Reciprocal Rank Fusion to eliminate retrieval failure modes in production RAG systems. The…
Сколько зарабатывают разработчики в 2026 году и куда пойти учиться
Разработчик — традиционно самая высокооплачиваемая специализация в IT. По данным исследования Хабр Карьеры за первое полугодие 2026 года, медиана дл…
Next.js + Node.js: Where Do You Draw the Line?
I've been building a few applications with Next.js and Node.js, and one thing I keep coming back to is: How much backend logic should actually live…
Fixing a Prisma Client Resolution Issue in a pnpm Monorepo
Introduction While working on the RAHB project, I encountered a Prisma issue in a pnpm monorepo where prisma generate could not resolve @prisma/clie…
Polymarket Bot Execution: Why Detecting a Signal Isn't Enough
A trading bot can detect the right signal and still lose the trade. That sounds strange at first. If the strategy correctly identifies an opportunit…
Мы списали uv со счетов. А потом он ускорил наш CI на 80%
Мы списали uv со счетов. А потом он ускорил наш CI на 80% В Python -сообществе вокруг uv уже несколько месяцев шум: быстрый резолвинг, один инструме…
Hidden complexity of building WebSocket servers from scratch
WebSockets Sound Simple Until You Have to Maintain One There's a moment every engineer hits when building a real-time feature: you look at the WebSo…
SQL Execution Order Internals: Why WHERE Fails on Aliases but ORDER BY Succeeds
Ever wondered why this query fails in SQL? SELECT department_id , COUNT ( * ) AS emp_count FROM employees WHERE emp_count > 5 -- ❌ Error: Invalid…
Building a Zero-Downtime Cache Invalidation Pipeline with Webhooks
Cache invalidation is notoriously difficult to get right in high-throughput systems. If your cache TTL is too short (e.g. 10 seconds), your database…
Webhooks vs Polling: Why Real-Time Integrations Matter in 2026
Webhooks vs Polling: Why Real-Time Integrations Matter in 2026 In modern software, knowing that something happened is often just as important as kno…
Stop Using Regex: Building Zero-Crash LLM JSON Pipelines in Production
Replace brittle string parsing with schema-enforced validation and self-healing repair layers. The Bottleneck in Production Most LLM pipelines don't…
Что изучить в начале осени: 34 открытых урока для тех, кто развивает карьеру в IT
Новые инструменты появляются быстрее, чем успеваешь их изучать: LLM, инфраструктура, фреймворки, подходы к разработке. Как выбрать то…
Декомпозиция: Основы
Декомпозиция помогает превратить большую и непонятную задачу в последовательность конкретных шагов. Разберём, как применять её в жизни, обучении, ра…
Introducing the Picverce AI Public API for image tools and generation models
Introducing the Picverce AI Public API Picverce AI just shipped a Public API so you can run the same image tools and generation models from your own…
ACH Return Code R01: Handling Insufficient Funds in Payout Systems
ACH Return Code R01: Handling Insufficient Funds in Payout Systems The source material about a sports trade doesn't align with fintech or payment in…
Why API Testing is the Silent Backbone of Great Software
Most of what makes a modern application work never appears on screen. Behind every screen tap or page load sits a network of APIs quietly passing da…
Managing Slack and Discord Bot Webhooks Without Getting Rate-Limited
429 too many requests Discord API rate limiting strategy async chat bot architecture asynchronous event handling asynchronous webhook processing AWS…
Simple SMS API Comparison: 3 Bounce-Suppression Controls for App Alert Status
Short answer: for B2B SaaS app alerts, choose an SMS API by whether webhook delivery events and polling results can feed one idempotent status ledge…
AOP: aspect / pointcut / advice / weaving
Every codebase grows a set of chores that have nothing to do with the actual job of a method, yet somehow end up inside every method anyway. Logging…
Building a Chat-Based Sales Bot That Doesn't Drop Messages During Flash Sales
Originally published at parvejshah.com/blog/conversational-commerce-webhook-architecture by Parvej Shah . In Bangladesh and much of South and Southe…
Frontend Backend Correlated Logging: Browser Fetch Request IDs and Server Logs
Short answer: give each browser fetch a request ID, carry it to the backend in a standard HTTP header, and emit that same ID in structured logs on b…
Load Balancing: How Backend Systems Handle Millions of Requests
Imagine you have built a backend API that works perfectly. You deploy it to a server, connect your database, and everything is running smoothly. The…
How do you design permissions for a multi-tenant SaaS product?
I’ve been thinking a lot recently while working on migrating the Role and Permission System of our organization-based SaaS product to a more scalabl…
Из Java во Flutter: я написала мобильное MVP и вот что поняла
Всем привет! Меня зовут Милена, я бэкенд‑инженер на Java в Банки.ру. Полтора года назад я вызвалась написать мобильное приложение для …
JWTs are Like Stamped Letters
My favorite thing about innovative mechanisms used in web infrastructure to deconstruct hitches is how they usually have very similar themes to our…