Tech Debt and Refactoring
Refactor strategies, rewrites, migrations, and the cultural patterns that turn legacy into leverage.
35 posts · page 1 of 2
- Tech Debt and Refactoring
The Critical Path Test Suite: A Founder's Definition
Not every feature needs tests. The critical path does. Here is what the critical path test suite is and how to build one that actually protects your product.
7 min read
- Tech Debt and Refactoring
The Code Review That Actually Improves Code
Most code reviews catch bugs. The best ones improve the engineer. Here is how to make code review a tool for quality and growth, not just gatekeeping.
6 min read
- Tech Debt and Refactoring
Test Coverage: A Metric With a Story
Test coverage tells you what percentage of your code runs during tests. It does not tell you whether those tests are meaningful. Here is how to use it correctly.
6 min read
- Tech Debt and Refactoring
Tech Debt in Startups: How It Kills Products and How to Manage It
Tech debt does not announce itself. It compounds quietly until velocity drops to zero. Here is how to manage it before it manages you.
7 min read
- Tech Debt and Refactoring
Snapshots, Property Tests, and the Modern Test Toolbox
Unit tests and integration tests are not the whole story. Here is what else belongs in a serious test suite.
7 min read
- Tech Debt and Refactoring
Refactoring Without a Test Suite: A Survival Guide
The ideal refactor starts with a full test suite. Most real refactors do not. Here is how to refactor code safely when the safety net does not exist and adding tests first is not feasible.
6 min read
- Tech Debt and Refactoring
Refactoring User Sessions Without Logging Anyone Out
Session architecture changes are among the riskiest refactors because doing them wrong logs out every user simultaneously. Here is the migration strategy that preserves session continuity through the transition.
6 min read
- Tech Debt and Refactoring
Refactor Stories That Saved a Startup
Not all refactors stall companies. Some unlock growth that was blocked by the existing architecture. These are the patterns that make refactoring a business decision rather than a technical indulgence.
6 min read
- Tech Debt and Refactoring
Refactor Stories That Killed a Startup
Refactoring is necessary and valuable. It is also one of the most reliable ways to destroy momentum at the wrong moment. These are the patterns that turn a reasonable engineering goal into a business catastrophe.
6 min read
- Tech Debt and Refactoring
Mutation Testing: A Discipline Worth Considering
High code coverage does not mean good tests. Mutation testing reveals whether your tests actually catch bugs. Here is what it is, when it adds value, and how to introduce it without adding meaningless overhead.
6 min read
- Tech Debt and Refactoring
Migrating From REST to GraphQL: A Strategic Read
GraphQL solves real problems but introduces its own. The migration from REST to GraphQL is not a performance upgrade; it is an architectural shift. Here is when it is worth it and how to do it without breaking existing clients.
6 min read
- Tech Debt and Refactoring
Migrating From Express to Fastify or NestJS or Beyond
Express still works but it shows its age in production. Here is when to migrate, which framework to migrate to, and how to do it incrementally without breaking the application that customers depend on.
6 min read
- Tech Debt and Refactoring
End to End Tests: When They Help and When They Hurt
End to end tests are the only tests that prove the system works for users. They are also the most expensive to maintain. The teams that get this balance right ship faster than the ones at either extreme.
12 min read
- Tech Debt and Refactoring
Code Smells That Predict Tech Debt
Not every code smell predicts pain. A few specific ones reliably do. The teams that catch them early pay less debt later. Here are the smells worth treating as warnings, not preferences.
12 min read
- Tech Debt and Refactoring
Big Bang vs Gradual Migration: A Decision Map
Big bang migrations look fast and end badly. Gradual migrations look slow and end well. The decision is rarely as binary as the framing suggests. Here is the map I use to pick.
12 min read
- Tech Debt and Refactoring
Adding Tests to a Legacy Codebase Without Going Mad
How to ship a useful test suite on top of a codebase that has none, without quitting the company. A staged plan that delivers safety before perfection.
12 min read
- Tech Debt and Refactoring
The Boy Scout Rule in Practice: Leaving Code Better Than You Found It
The boy scout rule applied to engineering: what it means to leave code better, the limits of the rule, and how to practice it without derailing your sprint.
12 min read
- Tech Debt and Refactoring
Why Your Test Suite Is Slow and How to Fix It
A slow test suite is a quiet productivity tax. Most of the slowness is a small number of fixable causes. This is the order I work in, and the patterns I see most often when I take over a slow CI pipeline.
12 min read
- Tech Debt and Refactoring
The Multi Year Refactor: Cultural Patterns That Make It Stick
The team behaviors that turn a multi-year refactor from a stalled wishlist into steady, measurable progress -- without stopping product work.
12 min read
- Tech Debt and Refactoring
The Database Migration Without Downtime
How to run a schema migration on a live production database without taking the application offline or losing a single row of data.
12 min read
- Tech Debt and Refactoring
The Refactor Sprint: When a Quarter of the Roadmap Becomes Cleanup
Sometimes the team needs to stop shipping features and spend a quarter cleaning up the codebase. Here is how to run that sprint without losing the team, the product manager, or the deployment pipeline.
12 min read
- Tech Debt and Refactoring
The Pareto Refactor: Twenty Percent Effort for Eighty Percent Improvement
Most refactor work improves the codebase by less than it costs in disruption. The Pareto refactor finds the twenty percent of changes that produce eighty percent of the improvement, and stops there.
11 min read
- Tech Debt and Refactoring
The Legacy Codebase: A Senior Engineer's Five Day Audit
How to assess a codebase you inherited in five days -- what to read, what to run, and what to report to the team before writing a single line.
12 min read
- Tech Debt and Refactoring
Why TypeScript Almost Always Pays Off in SaaS
TypeScript is not faster to write. It is faster to maintain, faster to refactor, and faster to onboard new engineers into. For a SaaS that will live for years, that math is decisive.
12 min read