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Case studySoftware FactoryLens & Co.

Global Edge Launch on Vercel — Under Budget, On Deadline

ISR plus edge configs for forty locales; Lighthouse green without a bespoke CDN science project.

Project overview

Problem

Marketing needed locale-specific campaigns without cloning repos; performance SLAs were missed on mobile networks.

Solution

Next.js on Vercel with ISR tiers, edge middleware for geo headers, and image pipeline tuned per breakpoint—not a manual CDN rule zoo.

Key metrics

40
Locales on one codebase
98
Lighthouse perf (median)
−52%
LCP vs legacy
3
Rollback windows tested

System architecture

Preview deployments per PR; production traffic split by region; analytics hooks validated before enabling aggressive cache policies.

Workflow

  • Baseline

    Synthetic RUM from real device lab profiles across target countries.

  • Tier ISR

    Hot paths revalidated faster; long-tail static with longer TTL.

  • Edge rules

    Locale detection without double redirects; cookie consent respected.

  • Launch

    Progressive enablement with instant rollback via deployment pinning.

Results & impact

Paid conversion on mobile climbed without extra headcount—performance became a factory output, not a hero project.

Deeper dive

Deeper dive

Stale-while-revalidate semantics meant merchandising pushes felt instant to shoppers while builds stayed predictable for engineers.