Multilingual Website Development Built for Speed

Multilingual website development means shipping a site that serves content in more than one language without tanking speed, SEO, or your content team's ability to work independently. Growth teams, e-commerce brands and SaaS companies come to us watching international traffic bounce because checkout, docs or product pages only exist in English, and once that happens the fix isn't a plugin -- it's a foundation change. Routing, content modelling and CMS all get built around locales from day one, rather than a translation plugin bolted onto an English-first site (an approach that doesn't hold up, and we've seen why).

That means handling the routing itself, whether subdirectories, subdomains or domain-based, along with hreflang and canonical setup, RTL layout logic for Arabic or Hebrew, and the translation workflow connecting your CMS to a platform like Phrase or Lokalise. A typical build runs 6-10 weeks depending on language count and content volume, priced against the fixed-fee bands we use for multilingual projects: $15,000-$25,000, scoped to your language count, page count and CMS complexity. What you get at the end is a site where every language variant is pre-rendered or server-rendered, scores 90+ on Lighthouse, and where adding a language later is a content task for your team rather than a rebuild for us. If you're running WordPress with a translation plugin and watching page speed crater every time you add a locale, this is the fix.

Who This Is For (and When It's the Wrong Choice)

We build this for teams where language is a growth lever, not an afterthought. SaaS companies expanding into new markets need localized marketing pages, docs and in-app copy that stay in sync as the product changes. E-commerce brands selling across borders need localized product pages, checkout flows and currency/date formatting that doesn't break at scale. Directories and marketplaces with content volume in the tens of thousands of pages need 30+ language variants that stay indexable and fast. And healthcare and regulated businesses need patient-facing content in multiple languages without crossing compliance boundaries.

None of this fits everyone, though. If you genuinely serve one market and one language with no plan to expand, the routing and CMS complexity here is overhead you don't need -- skip it. The same goes for teams needing just one extra language for a handful of static pages next week; a lightweight plugin will carry you until you're ready to do this properly, and if the budget can't stretch to the fixed-fee band above, we'd rather say so up front than half-build something that falls over at language number three.

How We Do It

We treat i18n as an architecture decision made in week one, not a feature bolted on in week ten. The build breaks into four phases:

Weeks 1-2: Architecture and routing. We audit your target markets, decide between subdirectories, subdomains or country-code domains, and map your content model in Sanity, Payload or your existing headless CMS. You get a routing and locale-fallback plan before any code ships.

Weeks 3-6: Build. We build the Next.js or Astro frontend with locale-aware routing baked in, CSS logical properties for automatic RTL mirroring, and server-rendered or statically generated pages per locale so there's no client-side translation overhead. Vercel Edge Middleware handles geolocation-based locale detection.

Weeks 7-8: Content and translation workflow. We wire your CMS to Phrase, Lokalise or an AI-assisted translation pipeline with human review, migrate your existing content, and set up locale-level publishing states so English can go live while German is still in review.

Weeks 9-10: SEO and QA. Hreflang tags (including x-default), localized sitemaps, per-locale metadata and structured data, then a Lighthouse pass across every language to confirm 90+ scores before launch.

Here's what you walk away with: a locale-ready codebase your developers can extend, a CMS your content team can run without filing tickets, documented hreflang and sitemap setup, and a translation workflow connecting your CMS to whichever platform you use. Adding language six after launch is a content task, not a new project.

What We've Shipped

Multilingual isn't theoretical for us -- it's on the page you're reading and in the client work we've delivered.

SleepDr.com, a sleep medicine practice, moved from WordPress to Next.js 15 + Payload CMS + Supabase with a HIPAA-safe architecture (patient forms handled via HIPAA-compliant Jotform, no PHI stored on our servers), medical schema, 20 city landing pages and four-language support, taking Lighthouse from 35 to 94 along the way -- a result backed by a verified 5.0 Clutch review. Full write-up: /blog/sleepdr-wordpress-to-nextjs-migration-lighthouse-35-to-94/.

Scale looks different for Deluxe Astrology, which runs on Next.js + Supabase across 91,000+ pages, 75+ calculators and 30 languages, with technical SEO built into the architecture rather than layered on after the fact -- proof that locale count and page count can both grow without the site slowing down.

Then there's this site. socialanimal.dev runs on Astro 5 with Supabase and React islands across 1,797 English pages and 11 languages, generated through our own AI content engine with Winston AI scoring, deployed on Vercel. We build multilingual architecture because we run on it ourselves.

Sources

Our hreflang and canonical decisions follow Google's own guidance on localized versions, and we measure our performance targets against the Core Web Vitals thresholds Google uses for ranking. Astro's per-locale static generation relies on the islands architecture documented by the Astro team, and our RTL layout work follows WCAG guidance on text direction and reading order.

If you're weighing a corporate rollout across many markets rather than a single site, our multilingual localisation platform work covers the enterprise version of this same architecture.

Next Step

If you're bouncing 60% of international traffic because your checkout, docs or product pages only exist in English, tell us your language count and current stack. We'll scope the fixed fee and the 6-10 week timeline against your actual content volume -- get in touch or check current pricing first.