A design-system migration that keeps shipping while the foundations change.
Most migrations fail when they ask the entire product to pause for architectural cleanliness. A better migration makes each active piece of work a little more coherent than the last.
Migrate by leverage
Begin where inconsistency is most visible, where the team spends the most time, or where a shared pattern will unlock multiple future features. The migration should reduce real work quickly enough that people want to continue it.
Keep the seam intentional
Old and new systems will coexist for a while. That is normal. What matters is knowing which layer owns which decision, and having a rule that retires a legacy exception on contact.
A practical outcome
The team keeps delivering. Each changed area gains a clearer foundation and a smaller maintenance burden. Eventually the old system becomes the unusual case, and the new one is where every team starts.
Make the next part of the product easier to build.
Bring the thing your team is repeatedly working around. We will work out whether a system intervention is the right move.
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