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

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

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.”
“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.
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No credit card required
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14-Day free trial