Legacy modernization.
Posts about legacy modernization by Filipe Eduardo, Senior Software Engineer.
14 posts
Page 1 of 2- Legacy modernization
Blue Green Deployment: Switch Systems With No Downtime
Blue green deployment explained by an engineer who led a live platform migration: traffic switching, database changes, rollback plans and when to use canary instead.
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Canary Deployment: Release to a Few Users First
Canary deployment explained: how to pick canary users, which metrics to compare, when to promote or roll back, and how canaries de-risk a live platform migration.
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Change Data Capture: Keep Two Databases in Sync
Change data capture explained: log vs triggers vs polling, ordering, duplicates, schema changes, CDC vs dual writes, and when to skip it in a live migration.
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Code Audit: What to Check in an Inherited Codebase
A practical code audit checklist for inherited codebases: access, build and deploy, money paths, common security issues, and what a useful report contains.
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Database Migration: Moving Data While Users Keep Working
How to run a database migration on a live product: sync strategies, verification, staged cutover and rollback, from an engineer who led a live platform migration.
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Feature Flags: The Switch Behind Every Safe Migration
Feature flags make a live migration reversible: the four flag types, build vs. buy, fail-safe defaults and cleanup, from an engineer who led one.
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Legacy Code Refactoring: How to Change Old Code Safely
How to refactor legacy code safely: characterization tests, picking targets by risk, small reversible steps, and when to switch to an incremental migration.
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Legacy Modernization Services: How to Evaluate a Partner
How to evaluate legacy modernization services: what they include, red flags of rewrite-first pitches, a 30-day handover plan, and questions to ask before signing.
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Legacy Modernization: A Practical Guide for Founders
Legacy modernization for founders and CTOs: when a system is legacy, the first 30 days of a takeover, and how to migrate a live platform incrementally.
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Refactoring: Improve Code Without Changing What It Does
Refactoring explained by a senior engineer: how it differs from a rewrite, when it pays off, and how to do it safely with tests, small steps and code review.
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Replatforming: What It Means and When to Do It
What replatforming means, how it differs from rehosting, refactoring and rewriting, what breaks most often, and how to migrate a live app incrementally.
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Strangler Fig Pattern: How to Replace a Live System
How the strangler fig pattern replaces a live system piece by piece: put a switch in front, move slices in a safe order, handle data, and know when not to use it.
