Prove your Next.js skills
Next.js work is mostly decisions: what renders where, what gets cached and for how long. Lemma records those decisions through live sessions, adaptive assessments and the apps you have deployed.
What Next.js competence looks like
A capable Next.js developer picks a rendering strategy per route on purpose. They know when a page should be static, when it needs request-time data, and how caching and revalidation affect what a visitor actually sees. When stale data shows up in production, they know which cache to look at.
They structure the App Router cleanly with layouts, loading and error files, keep client components small, and move data fetching to the server. They also care about the parts users feel: image and font optimisation, metadata for search, and middleware that stays fast because it runs on every request.
Route architecture walkthrough in a live session
60 min · Learning · with Noah B.
Noah B. rated the session
Practitioner · after the call
Clear reasoning on app router structure. Talked through trade-offs first.
App Router structure
Layouts, nested routes, route groups, and loading and error boundaries organised around the user's journey.
Rendering strategies
Static generation, dynamic rendering and streaming chosen per route based on the data each one needs.
Caching and revalidation
Request memoisation, data cache, revalidation by time or tag, and debugging stale content.
Server actions and forms
Mutations on the server, progressive enhancement, validation and safe handling of user input.
Metadata and SEO
Per-page metadata, canonical URLs, structured data and generated social images.
Performance and assets
Image and font optimisation, bundle size, and keeping client JavaScript to what the page needs.
What counts as evidence of Next.js skills?
Listing Next.js on a profile proves nothing on its own. What counts is a component you shipped, a session where someone watched you debug one, or a test you passed. These are the records Lemma can hold for your Next.js skill, and where each one comes from. See the evidence methodology for how each source is weighed.
Next.js
Lucia F. · SCI recomputed 9 Oct
Evidence · 4 entries
- Verified
A deployed Next.js app on Vercel
Vercel connector · 9 Oct
- Verified
Your Next.js repository on GitHub
GitHub connector · 2 Oct
- Rated 5.0
Route architecture walkthrough in a live session
Live session · 24 Sep
- Level 7.2
Adaptive assessment on rendering and caching
Adaptive assessment · 11 Sep
A deployed Next.js app on Vercel
Connect a Vercel deployment of a Next.js project you built. Lemma checks that the deployment exists and that your account has access, then re-checks it over time.
Your Next.js repository on GitHub
Link the repository behind the app, or the commit where you moved a route to server rendering. It shows how your routes, layouts and data fetching are organised.
Route architecture walkthrough in a live session
Talk a practitioner through your rendering and caching choices, or build a route together. Their rating records how clearly you reason about the server and client boundary.
Adaptive assessment on rendering and caching
Scenario questions ask which strategy fits a page and why content went stale. Harder rounds show route code and ask you to pick the real cause.
How is a Next.js skills test run on Lemma?
The Next.js test is adaptive: 15 to 25 questions, each picked from how you answered the last, built around real interface bugs rather than trivia. Its result joins your live sessions and linked repositories or deployments in your Next.js SCI, which also weighs how recent the evidence is.
A product page shows prices from yesterday after an update. What is the most likely cause?
- AThe client component re-renders too often
- BThe route uses a dynamic segment
- CThe page is cached and never revalidated
- DImages are not optimised
Walk through a real app
In a live session, show a Next.js project or build a route with a practitioner. Expect questions about why a page is static or dynamic, where data is fetched, and how revalidation works.
Answer adaptive scenarios
The Next.js assessment adjusts to your answers. Realistic scenarios cover rendering choices, caching, server actions and middleware. Harder questions count for more, and you can't go back.
Connect the deployment
Link the Vercel deployment and GitHub repository so your live sessions and assessment sit next to working software. Recent evidence counts for more, so keep shipping.
Next.js skills: common questions
How do I prove I can build production apps with Next.js?
What Next.js questions come up in frontend interviews?
Do I need to know React well before proving Next.js?
Can a side project count as Next.js evidence?
Skills related to Next.js
Browse the skills directoryReact
Show how you structure components, manage state and keep renders fast, with evidence behind it.
Evidence for ReactTypeScript
Show that your types catch real bugs instead of just silencing the compiler.
Evidence for TypeScriptNode.js
Evidence of how you build and debug Node.js services, from the event loop to production errors.
Evidence for Node.jsJavaScript
Evidence that you understand how JavaScript runs, not just how to write its syntax.
Evidence for JavaScript
Start your Next.js evidence record.
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