Two companies came up in search as building with Next.js for Kitchener-Waterloo clients. Both descriptions come from search snippets and the companies' own marketing pages. I haven't checked their portfolios, reviews or where they're actually based.

- **Codingclave** has pages for both Kitchener and Waterloo. It says it builds websites, portals, landing pages and web apps with Next.js, React and TypeScript. It also lists bilingual EN/FR support, PIPEDA compliance and local SEO for Google.ca. Its stated fixed-price range is CAD 800–4,000, which is low for custom work, so confirm what's included.
- **Vecta Creations** calls itself a full-service web engineering agency based in Canada. It lists React 19, Next.js 14, TypeScript, Tailwind CSS and Node.js. It has a Clutch profile, where you can read client reviews.

Fineart, a Canadian design agency, also came up as a Next.js specialist. The results didn't say where it's located, so it may not be local.

Before you choose, ask each for local client references and examples of live Next.js sites. You can also compare more Kitchener firms on Sortlist.

SOURCES:
https://codingclave.com/canada/web-development-kitchener
https://codingclave.com/canada/web-development-waterloo
https://codingclave.com/canada/waterloo
https://clutch.co/profile/vecta-creations
https://www.sortlist.com/web-development/kitchener-on-ca
https://webstaging.prismic.io/blog/top-nextjs-freelancers-and-agencies