Edge computing comes of age

For years the edge was a niche — CDNs for static assets and little else. That has changed. Runtimes now let you execute real application logic within milliseconds of your users, anywhere in the world, without managing servers in every region.

The appeal is obvious for anything latency-sensitive: personalization, auth checks, A/B routing, and API shaping all belong at the edge, where a round trip to a central database would cost you a hundred milliseconds you can't spare.

The trade-off is a new mental model. State is the hard part — the edge is stateless by design, so you architect around distributed data, eventual consistency, and careful cache invalidation rather than a single trusted database.

Used well, the edge collapses the distance between your users and your product. Used carelessly, it scatters your logic across two runtimes and doubles your debugging surface. The discipline is deciding what genuinely belongs there.