Web Design and Development

// What Is Our Web Design Service?

Web design is the end-to-end process of planning, designing and coding a corporate website around a business's needs. Zep Bilisim builds hand-coded HTML5, CSS3, JavaScript and PHP websites that are mobile-first, WCAG 2.1 AA accessible and SEO-friendly. More than 120 projects have been delivered since 2020.

// Why Modern Web Design Matters for Your Business

Your website is your business's storefront in the digital world. Prospects discover you, form first impressions and judge your professionalism through these pages. Research shows users make decisions about a site in the first 50 milliseconds - meaning a fast, modern and trust-inspiring site is not a preference but a requirement.

At Zep Bilisim we go beyond template approaches to build sites that are truly unique to your brand, speak to your audience and serve your business goals. Fast page loads, intuitive navigation, an excellent mobile experience and strong search visibility are the standards we apply to every project.

Sites coded with pure HTML5, CSS3 and vanilla JavaScript stay free of the weight created by heavy frameworks. This approach delivers both performance and long-term maintainability. Where PHP backend is needed we use modern, secure and maintainable structures. Each project is not just beautiful - it's a measurable tool that serves your business.

// Responsive and Mobile-First Approach

Today more than 60% of web traffic comes from mobile devices. Google also uses mobile-first indexing - meaning Google evaluates your site through its mobile version first. That's why we start design on mobile and scale up to desktop.

We don't just make sites that "work on phones." We design mobile experiences that look great from a 320px narrow screen all the way to a 2560px ultra-wide monitor, with thoughtful touch interaction and fast loading. CSS Grid and Flexbox for fluid layouts, clamp() and viewport-based units for dynamic typography, and lazy-loading for image optimization are part of our toolkit.

// SEO-Friendly Web Design

The most beautiful site is worthless if Google can't find it. Every phase of our web design service is planned around SEO principles: semantic HTML tags, heading hierarchy (H1-H6), alt-tagged images, clean URL structures, XML sitemap, robots.txt configuration and schema.org microdata. Core Web Vitals metrics - LCP, INP, CLS - are optimized on all projects.

After the technical SEO foundation is in place, we recommend our SEO Optimization service for advanced work. With keyword research, content strategy and link building, our expert team can multiply your organic traffic.

// The Advantages of Not Using a Framework

JavaScript frameworks like React, Vue and Angular are very popular today. But they aren't needed for every project - they're actually harmful for many marketing-focused websites. Why? They add hundreds of kilobytes of JavaScript, extend first-page load time, create SEO problems and complicate development. Building a "Hello World" with a 500KB React bundle on a corporate brochure site is like cracking a nut with a sledgehammer.

We champion vanilla JavaScript - not to be "old school," but for real performance gains. Modern JavaScript (ES6+) supports classes, async/await, modules and arrow functions natively. Intersection Observer, Web Animations API, CSS Grid and Flexbox eliminate the need for frameworks. Result: 10x faster page loads, easier maintenance and Google Lighthouse scores at 95+.

// Why Site Performance Is So Critical

Amazon found that every 100ms of additional page load time reduces sales by 1%. Walmart reported a 2% increase in conversion rate for every 1 second of speed improvement. These small percentages add up to large numbers on high-traffic sites. Since 2021 Google has used Core Web Vitals as an official ranking factor - slow sites lose in SEO too.

The performance targets we aim for on every project: LCP under 2.5s, INP under 200ms, CLS under 0.1, TTFB under 800ms, TBT under 200ms. To hit these we use image optimization (WebP/AVIF), inline critical CSS, font preloading, lazy-loading, code splitting, CDN, HTTP/2 and server-side caching.

For deeper performance and SEO work, see our SEO Optimization service. Together they make your site a professionally competitive digital asset.

// Accessibility (a11y) and Inclusive Design

Web accessibility (a11y) ensures all users with different abilities and needs can use your site. Screen reader support, keyboard navigation, color contrast, alt text, ARIA labels and semantic HTML are all part of inclusive design. We build sites that meet WCAG 2.1 AA standards, which both expands your audience and helps Google rankings.

Regulations like the 2025 European Accessibility Act make accessibility a legal requirement for corporate websites. Similar regulation is coming to Turkey too. We audit and report accessibility on every project.