Skip to main content

Custom web development

We build custom websites and web applications that turn visitors into customers. Performance, security, and design in every line of code.

What is custom web development?

Custom web development means designing and building a website or web application from scratch, around your business goals, instead of adapting a generic template. At Leonwebs, a web development agency based in León (Spain), we build corporate websites, online stores, web applications, and PWAs with React, Next.js, and TypeScript, optimized for search engines and for Google's Core Web Vitals.

Benefits of a custom website

Optimal performance

We optimize every website for Google's Core Web Vitals (LCP, INP, and CLS) with SSR, SSG, and automatic image and font optimization.

SEO from day one

Search engine optimized architecture: structured data, dynamic meta tags, and automatic sitemap.

Responsive design

Perfect experience on mobile, tablet, and desktop. Every pixel adapts to all screen sizes.

Built-in security

Security headers, CSRF protection, data validation, and OWASP best practices from the start.

What our web development includes

  • Corporate websites and landing pages
  • Online stores and e-commerce platforms
  • Complex web applications (SaaS, dashboards, portals)
  • Progressive Web Apps (PWA)
  • Third-party API and service integrations
  • Custom admin panels

Web development technologies

  • React
  • Next.js
  • TypeScript
  • Tailwind CSS
  • Node.js
  • PostgreSQL
  • Prisma
  • Vercel

How we build your website

  1. Requirements analysis

    We define objectives, features, and technical architecture.

  2. UI/UX design

    Wireframes and interactive prototypes focused on conversion.

  3. Iterative development

    Sprints with partial deliveries so you see real progress.

  4. Testing and launch

    Thorough testing, performance optimization, and deployment.

Frequently asked questions about web development

Will my website be optimized for SEO?

Yes. Every website we build ships with the technical SEO foundations in place: prerendered pages (SSR or SSG) that search engines can read without running JavaScript, semantic HTML, per-page metadata, structured data, an automatic sitemap, and Core Web Vitals optimization. Final rankings also depend on your content and on how competitive your sector is.

What are Core Web Vitals and why do they matter?

They are the three metrics Google uses to measure the real-world experience of using a page: LCP (loading speed, 2.5 s or less), INP (responsiveness to interaction, 200 ms or less), and CLS (visual stability, 0.1 or less). They matter because they reflect what users actually perceive and are part of Google's page experience signals. We optimize them with prerendering, optimized images and fonts, and the minimum JavaScript necessary.

Source: web.dev, Web Vitals (opens in a new window)

Can you build an online store or a PWA?

Yes. We build online stores and e-commerce platforms, Progressive Web Apps (PWAs), complex web applications such as SaaS products, dashboards, and portals, and custom admin panels, with whatever third-party API and service integrations your business needs.

Other Leonwebs services

Ready to get started?

Tell us about your project and we'll help you make it happen.

Request a quote