The Velocity Lab

The Migration You've Been Putting Off for Years

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Episode Summary

Engineering leaders have been sitting on the same migrations for years — monolith to microservices, ORM rewrites, framework upgrades — because the cost of doing them was always 50% of the engineering org for a year. Claude makes those migrations feasible. But not as a single 12,000-line PR. Dan and Dave break down the method that turns a five-year migration into a three-month migration with a skill, a cron job, and a learning loop.

Key Topics

  • The anti-pattern: 12,000- to 100,000-line migration PRs. Tempting with Claude, but the absolute wrong way
  • The method: pick a small piece, do the first migration with Claude in the loop, then have Claude write a skill from what you learned
  • Run the skill on a cron — Claude opens one small migration PR a day while you ship product code
  • Why the engineering fundamentals haven't changed: testing infrastructure, shadow reads/writes, upfront planning are still required
  • Adding a learning loop so every cron run gets smarter — each PR is less rocky than the last
  • Who this is for: engineering leaders, product leaders, and CEOs staring at tech debt they've been avoiding for years

    • Notable Quotes

    • "30,000, 50,000, a hundred thousand line PRs are not the answer."
    • "Your three-year migration is now a six-month or a three-month migration. And the most important thing is — you're not spending any time on it."
    • "All the core engineering principles that you've already learned are still super, super valuable."

      • About The Velocity Lab

      Dave O'Dell and Dan McAulay work inside engineering organizations every day helping them ship faster with AI. No hype, no BS — just what's working in the field.

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      The Velocity LabBy Dave O'Dell and Dan McAulay