What is Next.js?

0-2 years experience

1. 1We need a new "About" page in our Next.js project. How would you create it and make sure it’s reachable via /about?
2. 2If you add a component file inside the pages folder, what does Next.js automatically do with that file?
3. 3What happens under the hood when you navigate from one page to another using the Next.js Link component?

2-5 years experience

1. 1Our product‑list page uses getServerSideProps and is loading slowly during peak traffic. How would you diagnose and improve its performance?
2. 2We have a page that rarely changes but must be SEO‑friendly. Would you use getStaticProps with revalidation or getServerSideProps, and why?
3. 3You added an API route at /pages/api/user.js that returns JSON, but the client receives a 404. What could be causing that?

5-8 years experience

1. 1Design a strategy for an e‑commerce site that needs SEO, personalized content, and frequent inventory updates using Next.js features.
2. 2How would you implement caching and invalidation for a large number of ISR pages to keep them fresh without overwhelming the origin server?
3. 3Explain how you would organize a monorepo that contains several Next.js apps sharing UI components and utilities while avoiding version conflicts.

8+ years experience

1. 1Our legacy React SPA must be migrated to Next.js across multiple product teams. Outline the migration plan, key risks, and how you’d keep both teams productive during the transition.
2. 2Multiple teams need consistent routing conventions and data‑fetching patterns across dozens of Next.js services. What governance and architectural guidelines would you establish?
3. 3For a global SaaS platform with strict multi‑tenant isolation, how would you leverage Next.js to enforce tenant boundaries while still delivering high performance at scale?