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Service details

Web Application & Website Development

We design and build high-performance websites and web applications that are fast, accessible, and optimized to convert. Whether you need a marketing site, a SaaS product, or a complex web platform, we bring both engineering depth and design sensibility.

Every project starts with your goals: more leads, better retention, faster time-to-market. We build to those outcomes — not just to a spec.

What’s included

  • Custom website design & development
  • SaaS and internal web application development
  • CMS integration (Sanity, Contentful, WordPress headless)
  • Performance optimization (Core Web Vitals, Lighthouse 90+)
  • SEO-ready architecture and structured data
  • Accessibility compliance (WCAG 2.1 AA)
  • Analytics setup and conversion tracking

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Use cases

  • Build a high-converting marketing website with CMS editing capability
  • Develop a multi-tenant SaaS platform from MVP to scale
  • Replace a slow legacy website with a modern, headless architecture
  • Create a customer portal or internal dashboard with real-time data
  • Launch a landing page suite with A/B testing infrastructure

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Tech stack

  • Next.js, React, TypeScript
  • Tailwind CSS, Framer Motion
  • Sanity, Contentful, Strapi
  • Vercel, Cloudflare, AWS
  • PostgreSQL, Supabase, Prisma

What our clients say

“Crossline redesigned our platform and our conversion rate jumped by 28% in the first month.”

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“We needed a complete rebuild — fast, modern, and SEO-ready. Crossline delivered ahead of schedule and the results speak for themselves.”

Laura Mendes

CMO at Growthly

Build a complete website using the assistance

Start your free trial today and see your ideas come to life easily and creatively.

  • No credit card required

  • 14-Day free trial