The AI Wrote the Diff. The Tests Wrote the Verdict.
The AI Wrote the Diff. The Tests Wrote the Verdict. AI refactor suggestions are hypotheses. Not facts. A free coding model rewrites your messy legac…
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The Golden-File Refactor Loop: Record, Verify, Move, Commit
You do not understand the messy function. That is fine. The snapshot does not care about your understanding. Golden files turn "I think this is safe…
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…
Letting AI refactor one legacy stylesheet
The patient: one legacy Sass file The target was a legacy client CSS file: about 1,200 lines of hand-written Sass from before Tailwind was standard…
Three Attempts to Refactor a Large Flutter State Class — and the Final Solution
A step-by-step record of refactoring an 800-line State class. What do you do when your State grows beyond maintainability? 1. When Do You Know It's…
Refactoring Safely: A Step-by-Step Guide
Refactoring Safely: A Step-by-Step Guide Refactoring is like renovating a house: you want to improve the structure without breaking the plumbing. Do…
Trying to Be Too Careful: Catching the Same Error Three Times
One day I was wiring Supabase auth for a login page in one of my personal projects. I forced an error for manual testing — and got two error message…
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…
I put my entire CRUD in one React hook. It felt efficient. Then it wasn’t.
They say every bad decision comes from a good intention. I'd say it comes from good intentions… and a little lack of thinking things through. This i…
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.…
whoimports: who still imports this Python module?
Before you rename, move, or delete a Python module: who still imports this? Grepping hits strings and comments. Importing the package can run side e…
Managing technical debt without halting delivery
Technical debt gets talked about like moral failure — sloppy work someone should feel bad about. That framing is wrong and it leads to bad decisions…
The Field Took Twenty Minutes
"Just add a field? It's a 20-minute job." We've all said it. And three days later, you're still knee-deep in a labyrinthine codebase, the ticket is…
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…
Reducing Complexity: Replacing Entity-Based Services and Repositories with Purposeful Layers in Software Design
Introduction: The Prevalence of Entity-Based Patterns Walk into any mid-sized software project today, and you’ll find the same architectural bluepri…
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…
When One Enum Is Secretly Two
I was one commit away from a bug that would never have thrown an error. My system keeps every closed vocabulary in a single file — one source of tru…
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.…
The precedence rule deserves a name
The bug report opened on charmbracelet/glow yesterday morning. Title: TUI doesn't respect --style . The repro ran glow --tui -s light and the output…
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…