The Bug Is in the Files: Characterize Filesystem Side Effects Before a Messy Refactor
Conclusion first: in a messy repo, the refactor usually breaks files, not stdout. Teams write golden tests for console output. Almost nobody asserts…
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Your Agent Renamed the Function — It Just Missed the Caller That Referenced It by String
The rename that looks safe You ask the agent to rename process_payment to settle_payment . It runs across the codebase, updates every import, rename…
Pin Apply Order Before One Discount Extract
Pin apply order before you extract one discount rule. A free coding pass can draft the smallest patch. Frozen checks still decide whether that patch…
Strangling Procedural Legacy PHP into Laravel
The big bang rewrite is the most confident decision an engineering team can make and one of the worst. The pitch is always reasonable. The current s…
Your thresholds do not belong in constants
Every tuning change needed a code review, a release, and a week of store rollout. So we stopped tuning, which is the worst possible outcome. Eightee…
Freeze Object Identity Before One Mutator Extract
Extract one mutator only after tests pin object identity. Value equality alone hides alias bugs in shared containers. A copied list can match every…
Building a Culture of Continuous Refactoring
There is a lot of literature about how to refactor code and what techniques to apply, but sometimes we forget one important aspect: the human factor…
Pin urlencode doseq and quote_via Before One Query Extract
Pin the query-string contract before any helper extract. Extract one encoder only after those bytes stay frozen. Messy HTTP clients scatter urlencod…
Mainframe Migration Tools: What Works and What Fails
Every mainframe migration begins with someone searching for mainframe migration tools, and every vendor demonstration that follows looks remarkably…
Mainframe Modernisation: Rewrite, Refactor or Replatform
Mainframe modernisation is rarely a single decision. It is a choice between several distinct strategies, each with a very different cost, timeline,…
COBOL to C# Migration - A UK Enterprise Guide 2026
COBOL still underpins a vast amount of the software running in UK banks, insurers, public sector bodies, and large retailers. Much of it processes m…
COBOL to Rust Migration - A UK Enterprise Guide 2026
Rust is an increasingly popular COBOL migration target for organisations that want both memory safety and high performance without a garbage collect…
[Go in Practice] Writing Modern Go with AI: Testing JetBrains go-modern-guidelines and Refactoring a 1,039-line main.go
Background In the AI era, even I delegate most of my code optimization or writing tasks to AI. However, due to factors in model training data, too m…
Java 5 Legacy Patterns and Migration Strategies (2026-08-21 14:32)
Java 5 Legacy Patterns and Migration Strategies Released in 2004, Java 5 (also known as Java 1.5) introduced language features that fundamentally ch…
COBOL to Python Migration - A UK Enterprise Guide 2026
COBOL powers an estimated hundreds of billions of lines of code still running in global financial systems, government infrastructure, and enterprise…
The CSS Problem Nobody Thinks Is Solvable
James Coombs is a design engineer who migrated a large frontend from Material UI to a custom design system (Radix, Tailwind). Four CSS systems had t…
Your Migration Guide Is Already Wrong
James Coombs is a design engineer who replaced a migration guide with 49 JSON data files and a handoff playbook. Engineers on four other teams migra…
Symfony and PHP 8.4: Modernizing Without Rewriting Everything
Upgrading a Symfony application to PHP 8.4 doesn't have to mean rewriting half the codebase. For applications that have been running in production f…
Refactoring OpenTelemetry Metrics: from God Class to Per-Subsystem Modules
The constraint that shapes everything A refactor that recently landed in a codebase I work in replaced our metrics god class with per-subsystem modu…
[Перевод] Экономическая выгода рефакторинга в эпоху AI-агентов
Осваивая разработку с помощью AI-агентов, я написал веб-приложение для собственной ежедневной работы. Проект получился довольно сложным: с динамичес…
The Problem with AI-Generated 'Shadow' Duplication
AI agents are incredible at writing functions. They're even better at accidentally duplicating your entire business logic without you realizing it.…
Modernizing Go Code: Automating Updates to Enhance Consistency and Leverage New Language Features
Introduction Modernizing Go codebases has long been a manual, error-prone process, particularly as the language and its standard library evolve rapi…
How to Rewrite Your Software System Without Stopping Your Business
Originally published at spectredev.xyz . Cross-posted here for the Dev.to community. Planning a system rewrite? Learn the strategies that let you mo…
AI Code Refactoring: Why Testing Still Matters
Quick Answer: While AI agents can rewrite or refactor thousands of lines of code in hours, generating the code is only half the battle. Verifying th…
The Singleton Labyrinth
Play the game first: voku.github.io/DevLabyrinth/ It teaches the problem faster than another architecture sermon ever could. You enter a labyrinth.…
Beyong New and Delete: from auto_ptr to unique_ptr
This guide walks through a legacy pattern built around std::auto_ptr , something still found in many older C++ codebases. The pattern usually involv…