Web Development

Web Development Company in Belgium

Professional Web Development That Drives Business Results. Your website is your most important digital asset. We design and build modern, fast, SEO-optimized websites and web portals that convert visitors into customers — built with cutting-edge technology and designed for performance.

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In short

Rui Codex is a web development company in Belgium that builds corporate websites, client portals, e-commerce platforms and progressive web apps: fast, mobile-friendly and built to be found in search. A corporate website typically takes 4-8 weeks from kickoff to launch; web portals and e-commerce platforms take 8-16 weeks.

We work on site in Belgium and the Benelux and deliver projects remotely across Europe, including Germany, Austria, Switzerland and France, in English, Dutch, French, German or Turkish, with the GDPR applied to all work.

Does This Sound Like You?

Common challenges businesses face with their web presence.

Slow, Outdated Website

Your website looks dated and loads slowly, hurting your brand credibility and driving visitors away.

Not Ranking on Google

Your competitors appear on Google but you don't. Poor SEO structure means missed leads and lost revenue.

Not Mobile-Friendly

Most web traffic now comes from phones. If your site does not work on a small screen, a large share of your audience never sees it properly.

No Self-Service Options

Customers can't book appointments, check orders, or find answers online — everything requires a phone call.

Websites Built for Results

We combine striking design with robust engineering to deliver websites that look great, perform fast, and rank well on search engines.

Modern, Fast, and Conversion-Focused

Every website we build starts with your business goals. Whether you need a corporate presence, a customer portal, or a full e-commerce platform, we architect every pixel and every line of code to support your growth.

  • Mobile-first responsive design
  • Core Web Vitals optimized
  • SEO-ready from day one
  • WCAG accessibility compliance
  • SSL, security headers, GDPR-ready

The Impact of a Great Website

3x
More lead conversions
<2s
Average load time
70%
More organic traffic
100%
Mobile responsive

Our Web Development Services

From corporate websites to complex web applications — we cover the full spectrum.

  • Corporate Website Design

    Professional, brand-aligned websites that establish credibility and convert visitors. Custom layouts, compelling copy, and conversion-optimized pages.

  • Web Portal Development

    Customer portals, partner dashboards, and internal tools with secure authentication, role-based access, and real-time data views.

  • E-Commerce Platforms

    Online stores with product management, payment gateways, inventory sync, and multi-channel selling. Shopify, WooCommerce, or fully custom.

  • Progressive Web Apps

    App-like web experiences that work offline, send push notifications, and install on home screens — no app store required.

  • SEO & Performance Optimization

    Technical SEO, Core Web Vitals tuning, structured data markup, and performance audits that improve your search rankings and page speed.

  • CMS Integration & Training

    Easy-to-use content management systems so your team can update pages, blog posts, and media independently. Full training included.

Our Web Development Process

A structured approach that delivers on time and exceeds expectations.

  1. 1

    Discovery & Strategy

    We learn your business goals, audience, and competitors to define the project scope and sitemap.

  2. 2

    UX & Design

    Wireframes, mockups, and interactive prototypes reviewed with your team before any code is written.

  3. 3

    Development

    Clean, semantic code with responsive layouts, CMS integration, and SEO best practices baked in.

  4. 4

    Testing & Launch

    Cross-browser testing, performance audits, and a smooth go-live with zero downtime.

  5. 5

    Support & Growth

    Ongoing maintenance, analytics monitoring, and iterative improvements to maximize results.

What Can We Build for You?

Common web development projects we deliver for businesses across Belgium and Europe.

  • Corporate Website Redesign

    Modernize your online presence with a fresh design, faster performance, and better conversion rates.

  • Customer Self-Service Portal

    Let customers check order status, download invoices, and manage accounts without contacting support.

  • Multi-Vendor E-Commerce

    Marketplace platforms with vendor management, product catalogs, payment splits, and review systems.

  • Internal Knowledge Base

    Centralized documentation portals with search, access control, and version history for your team.

  • Booking & Reservation System

    Online scheduling with availability management, payment processing, and automated confirmations.

  • Marketing Landing Pages

    High-converting campaign pages with A/B testing support, lead capture forms, and analytics integration.

Web Platforms We Have Built

The project types above are not hypothetical: each of these is a published case study or one of our own products.

  • A secure client portal for an investment advisory firm: a client management panel with two-factor authentication, end-to-end encryption and real-time market data processing.
  • A B2B sales portal on which a distributor's dealers place orders online, with pricing and stock synchronised in real time with its Netsis accounting system.
  • Nexcustom, a product customisation platform for an Etsy-based shop: it retrieves products, orders and customer data through the Etsy API, customers personalise products with interactive canvas-based tools, and the platform then manages production and shipping.
  • EveryTranslate, our own translation platform: an ASP.NET Core (.NET 10) application with SQL Server, document translation that preserves formatting, and a REST API for developers.
  • Idle Defense, one of our own games: written in React and TypeScript, built with Vite and packaged for Android with Capacitor, so one web codebase also ships as a store app.

What Every Website Project Includes

Whatever the size of the site, these are part of the delivery, not extras.

  • A mobile-first, responsive build for phones, tablets and desktops.
  • On-page SEO fundamentals: semantic HTML, meta tags, structured data and a sitemap.
  • Cross-browser testing and a performance audit before launch.
  • Accessibility built to the WCAG guidelines, plus SSL and security headers.
  • A content management system your team can edit without code, with training and documentation.
  • Full repository access and a handover package at the end of the project.

Technologies We Use

We choose the right technology for your project's specific needs and long-term goals.

ASP.NET Core
React
Next.js
Tailwind CSS
WordPress
Shopify
Bootstrap
HTML5/CSS3

ASP.NET Core is the framework this website and EveryTranslate run on, and React with TypeScript powers Idle Defense. The methodology, testing and security practices behind every build are set out on our technology and methodology page.

Frequently Asked Questions

Common questions about our web development services.

A typical corporate website takes 4 to 8 weeks from kickoff to launch. More complex projects such as web portals or e-commerce platforms can take 8 to 16 weeks depending on features, integrations, and content volume.

Cost depends on the scope, the design work, the content and the integrations involved. After a free discovery call in which we scope the project with you, we give a detailed written quote.

Yes. Every website we build includes on-page SEO fundamentals: semantic HTML, meta tags, structured data, fast load times, mobile optimization, and sitemap generation. We also offer ongoing SEO services for content strategy and link building.

Absolutely. We integrate user-friendly CMS solutions so your team can update text, images, blog posts, and pages without any coding knowledge. We also provide training sessions and documentation.

Yes, all our websites are built mobile-first with responsive design. They adapt seamlessly to desktops, tablets, and smartphones, ensuring a great user experience on every device and meeting Google's mobile-first indexing requirements.

It does if the website lets consumers buy products or services online. Under Directive (EU) 2019/882, EU countries apply its accessibility requirements from 28 June 2025, and its e-commerce rules cover the online sale of any product or service to consumers. Microenterprises providing services - fewer than 10 employees and no more than €2 million in annual turnover or balance sheet total - are exempt.

You own the code and files we write for you, as set out in our terms. At the end of the project you receive full repository access and a handover package. Third-party components such as a CMS, plugins or licensed fonts stay under their own licences.

Support continues after launch: ongoing maintenance, analytics monitoring and iterative improvements, as in the last step of our process. What maintenance covers, and what it costs, is agreed per project before launch.

Yes. Redesigning an existing corporate website is one of the project types on this page. We first review what the current site does well and what it lacks, and then propose either a redesign or a full rebuild.

Often, yes. Flemish SMEs that already export can apply to Flanders Investment & Trade (FIT) for a flat subsidy towards a multilingual website, webshop, company film or social media content, provided an external specialist both builds and translates it. You apply yourself through Mijn FIT, at least seven days before the work starts, and FIT alone decides whether you qualify and how much you receive; Dutch-only content and translation-only orders are excluded. We supply the invoices and the FIT acknowledgement that the subsidy requires on the finished site. Details (in Dutch): FIT subsidy for digital international communication.

Yes. Each language gets its own URL, hreflang annotations tell search engines which version to show in which market, and every version has its own page titles and descriptions. Country-specific pages are added where the law requires them, such as the legal notice (Impressum) that websites in Germany and Austria need. This website is built that way, in five languages.

Delivered work

Real projects rather than scenarios - what was built, and how.

Products we build and run ourselves

Live apps and games we designed, built and still maintain, with the same engineering we bring to client work.

Idle Defense

Game

EveryTranslate

App
See all our apps and games

Where we work

Rui Codex is a Belgian company and works on-site with clients across Brussels, Antwerp, Ghent, Leuven and Liège, serves clients across the Benelux (Belgium, the Netherlands and Luxembourg), and delivers projects remotely across Europe. See all service areas.

Outside the Benelux: how we work with companies across Europe.

Ready to Build a Website That Works for Your Business?

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