# Экстремально чистый код
Старый код редко лежит бесплатно. Даже если его никто не вызывает, он попадает в поиск, ревью, CI, локальный запуск и голову каждому новому разработчи…
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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…
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…
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 — …
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 …
A Tiny Retry Utility That Saves You From Random Failures
Sometimes the difference between a flaky system and a reliable one is just a few lines of retry logic. Network calls fail, APIs timeout, and transient…
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…
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…
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…
Authentication Mechanisms: JWT, OAuth, and Single Sign-On (SSO)
Introduction In modern application development, securing user authentication is a foundational requirement. As systems scale and threats become more s…
Most Real-Time Platforms Don't Fail From Scale. They Fail From Ambiguity
A lot of engineering teams spend time preparing for scale before they prepare for ambiguity. That sounds backward at first, but in practice ambiguity …
Why queues don’t feel “instant” in real backend systems?
When I first learned about queues and background workers, I imagined something like this: request comes in job goes into queue worker picks it up imme…
Caching Is Easy. Production Caching Is Not.
This post is part of the series The True Code of Production Systems . The first time you add caching to a system, it feels like a superpower. One afte…
Everyone Talks About How to Build Secure Auth. Nobody Talks About What to Watch After You Ship It.
This is a bonus post in the AuthShield series - a production-ready standalone authentication microservice. The original 4-part series covered building…
Most webhook security guides protect the wrong side. The scary part is delivery.
Everyone secures webhook ingestion. Almost nobody talks about SSRF via the delivery worker. I've been staring at webhook architectures for years, and …
Rust vs Go vs Zig for High-Performance Backend Services in 2026
Rust vs Go vs Zig: High-Performance Backend Services in 2026 Three languages compete for the performance-critical backend market. Each makes different…
Researchers Just Made AI 100x More Energy-Efficient. The Method Is What You Should Be Watching.
Book: Observability for LLM Applications — paperback and hardcover on Amazon · Ebook from Apr 22 Also by me: Thinking in Go (2-book series) — Complete…
PHP to Go: The Mental Model Shift Nobody Warns You About
Book: Observability for LLM Applications · Ebook from Apr 22 Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal…
Rust vs Go for AI Infrastructure in 2026: Here's What the Benchmarks Actually Say
Book: Observability for LLM Applications · Ebook from Apr 22 Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal…
GraphQL vs REST: 18 Claims Fact-Checked with Primary Sources (2026)
What happens if we take a scientific approach to analyzing the most common claims about GraphQL vs REST? You might be thinking that you know the answe…
Building a Fintech Infrastructure Platform From Scratch: What I Thought It Would Take vs. What It Actually Took
** The Brief ** A fintech startup needed a platform that lets other fintech companies the kind building neobanks, savings apps, lending products in Ni…
Не просто дашборд: как DORA-метрики помогли нам сократить инциденты на 80%
DORA-метрики легко обсуждать как что-то довольно очевидное: выбрал четыре показателя, подключил данные, построил графики — готово. На практике все инт…
Part 2: The Dataset - Labels, Heuristics, Synthetic Data, and Why AI Starts Before the Model
Before we begin, if you have come directly to this post (Part 2 of 6), here is Part 1 where I explain the basics and set the expectations from this se…
Automation Pipeline Reliability: Why Your Workflow Breaks When Nobody Is Watching
If your deployment, sync, backup, or report workflow depends on scheduled or chained automation, automation pipeline reliability is not a nice-to-have…