Why Soft Deletes Are Breaking Your SaaS Database (And How to Fix It) 🛑
The Soft Delete Trap In Laravel, enabling SoftDeletes is as easy as adding a trait to your Eloquent model and a deleted_at timestamp to your migration…
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The Monolith is Dead (Again): Why Microservices Are Still Overhyped for Most SaaS
The Monolith is Dead (Again): Why Microservices Are Still Overhyped for Most SaaS Every few years, the tech world declares the monolith dead, ushering…
CLAUDE.md for Node.js: 6 Rules That Stop AI From Generating Bad Backend Code
CLAUDE.md for Node.js: 6 Rules That Stop AI From Generating Bad Backend Code You ask Claude to "add a POST /users endpoint" and you get back: A .then(…
What breaks when you try to plug AI into an existing backend
Most teams think adding AI is simple. Call an API. Send some data. Get a response. In reality, the moment you try to plug AI into an existing backend,…
Rust's Zero-Cost Abstractions, What Monomorphization Actually Does to Your Code
"Zero-cost abstractions" is one of Rust's core promises. You can write generic, composable, high-level code and the compiler will produce the same mac…
Python's Descriptor Protocol, The Feature Behind Everything You Use Daily
You use descriptors every day. Every time you write @property , every time you call a method, every time you use @staticmethod or @classmethod , you a…
The Go Memory Model, Why Your Concurrent Code Might Be Lying to
You write two goroutines. One sets a variable, the other reads it. You run it a thousand times and it works fine. Then it breaks in production, on a d…
How to Build a Production-Ready Secure Python API (JWT, Rate Limiting, and Caching)
Introduction Most Python APIs work perfectly in development—and fail in production. The issue is rarely functionality. It’s missing security and resil…
Guardrails in AI: Keeping LLMs Safe
🤔 Imagine asking an AI agent to generate a database query… and it returns something wrong — or worse, unsafe. The problem isn’t just intelligence. It’…
Async Processing: The Secret to Surviving Spikes
How decoupling work from requests helps systems stay stable under load In the previous part, we saw the limitations of synchronous systems. When every…
What Actually Breaks When You Connect AI to Real Enterprise Data
Connecting AI to real enterprise data sounds straightforward. Give it access to your systems. Let it read data. Let it take actions. In reality, this …
Building Real-Time Chat That Doesn’t Break at Scale (and Actually Uses AI Properly)
Building Real-Time Chat That Doesn’t Break at Scale (and Actually Uses AI Properly) Most teams underestimate chat. When you try to go past the demo, c…
Microservices: A Practical Crash Course for Engineers Who Actually Ship
Microservices: A Practical Crash Course for Engineers Who Actually Ship Microservices have become one of the most discussed architectural patterns in …
Bank Financial ERP: 20-Module Banking-Grade Enterprise System
WHAT MOST PEOPLE DON'T REALIZE ABOUT BANKING SOFTWARE When people think about software for banks, they usually think about the customer-facing side — …
Why ERP integrations silently fail in production (and how I fixed it in Go)
Most integration systems don’t break immediately. They fail silently over time by corrupting your data. I learned this the hard way while building ERP…
GraphQL vs REST - Which One Should You Really Use?
For years, REST APIs have been the standard. Then GraphQL came in with promises like: “Fetch exactly what you need” “Reduce API calls” “More flexible …
How I Rebuilt a Three-Layer Cache System in Java — Redis, L1, and MongoDB Done Right
I've been working on Nexus , a backend infrastructure project, and recently hit a point where the data synchronization layer needed a serious rethink.…
A Background Job Was Crashing Our JVM Every Week - Until We Taught It to Stop
Some Java services don't fail because of traffic. They fail because background jobs don't know when to stop. A background job should never be able to …
Borrowed Strings: API Designs That Cut 94% of Allocations
The 6ms latency improvement from one character change — how &str over String transformed our hot path performance Borrowed Strings: API Designs Th…
RestTemplate vs RestClient vs WebClient
The HTTP Client Showdown Every Spring Developer Needs to Understand If you've been writing Spring applications for a while, you've probably had this c…
Message Queues Explained: RabbitMQ vs Kafka vs SQS — When to Use What
Why Message Queues? Imagine Service A needs to send emails after a user signs up. If it calls the email service directly: What if the email service is…
Giving Your Accounting App a Brain: NestJS "MCP"
Recap Let's be real: in the last blog we were running a local MCP server on my pc, wiring it up to GitHub Copilot like mad scientists. It was awesome.…
How We Log LLM Requests at Sub-50ms Latency Using ClickHouse
We were logging 50,000 LLM requests per day to PostgreSQL. Query latency was fine. At 400,000 requests, cost aggregation queries started taking 3 seco…
Why Is Redis INCR a Bad Fit for a Public URL Shortener?
LeetDezine Redis INCR is one of those solutions that looks perfect the first time you see it. Atomic counter increments. Every call returns a unique i…
If your refresh token gets stolen, rotation alone won't save you — here's what does
Standard advice for refresh tokens is pretty straightforward: rotate on every use store them hashed keep expiry short Done, right? Not quite. Rotation…
What cave diving taught me about distributed systems
What cave diving taught me about distributed systems I've been building backend systems for 14 years. I've also spent a decent chunk of the last decad…
The Code Pattern That Keeps Our Integrations Stable in Production
When you connect real systems - ERPs, APIs, AI workflows - things don’t behave cleanly. Requests retry. Webhooks get sent twice. Sometimes something s…
Privacy-first mind mapping app. Part 2: Rust Backend - Why the Pain Is Worth It
Choosing Rust for a backend can feel irrational at first. If your short‑term goal is raw development speed, Rust does not win. The compiler is unforgi…
Не всё деплоем правится: как мы вынесли интерфейс из кода с помощью Server-Driven UI
Изменения интерфейса мобильного приложения часто упираются не в сложность реализации, а в скорость релизного цикла: даже простые правки проходят через…
Error 500? Как вместо кодов получать подробные сведения обо всех ошибках сразу
Привет, Хабр! Меня зовут Артём Корсаков. Я пишу на Scala и руковожу группой разработчиков в компании «Криптонит» , а также веду Scalabook — русскоязыч…