Executive Summary
- Budget (CapEx/OpEx): clear blocks (discovery, architecture, per-template migration effort, QA/performance, hypercare) + ongoing costs (hosting, monitoring).
- Risk heatmap: prioritized risks (SEO drop, performance regression, auth, i18n, accessibility, build stability) with concrete countermeasures and rollback plan.
- Ownership/RACI: lean steering with sponsor (C-level), product, engineering, SEO — every gate has a designated owner.
- Milestones: Foundation → Pilot/Canary → Parallel-Run → Cutover → Hypercare — Go/No-Go by p75 CWV, error rate, SEO smoke tests.
- Reporting: 5 KPI bundles (CWV, error budget/SLO, SEO visibility/CTR, release stability, business metrics).
Why now? The App Router standardizes data fetching, streaming and RSC → faster pages, less client JS, simpler maintenance. Practical hreflang/canonical/i18n guidance: Next.js SEO Guide.
If you want to manage migration without roadmap freeze, our Next.js Agency supports you with Budget-Guardrails, Canary & KPI-Gates.
