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Web development and mobile apps – websites, PWAs and native apps
Web & Mobile

Web Development & Mobile Apps – Websites, Web Apps, PWAs

We build modern websites, powerful web apps and progressive web apps (PWAs) for your business. Performant, user-friendly and future-proof.

Web Development – Responsive websites and web applications for businesses

Your Digital Presence

In today's digital world, a professional presence on all devices is essential. We develop customized websites, web applications and mobile apps that are not only visually appealing but also technically state-of-the-art.

Our solutions are responsive, user-friendly and search engine optimized. We place great emphasis on performance, security and accessibility to provide your users with an optimal experience.

Whether corporate website, online shop, complex web application or native mobile app – we implement your requirements with the latest technologies and ensure that your digital presence contributes to your business success.

Our Web & Mobile Development Services

Responsive Web Design

Modern websites that are optimally displayed on all devices and offer an excellent user experience.

  • Mobile-First Approach
  • Optimized Performance
  • Accessibility

Native App Development

Powerful native apps for iOS and Android with optimal performance and access to all device features.

  • Swift and SwiftUI for iOS
  • Kotlin and Jetpack Compose for Android
  • Seamless Integration with Device Hardware

Cross-Platform Development

Efficient development of apps for multiple platforms with a shared codebase.

  • Flutter and Dart
  • React Native
  • Faster Time-to-Market

Content Management Systems

User-friendly CMS solutions that allow you to manage your content easily and flexibly.

  • WordPress, TYPO3, Drupal
  • Custom CMS Solutions
  • Headless CMS

E-Commerce Solutions

Professional online shops with all the features you need for successful e-commerce.

  • Shopware, WooCommerce, Magento
  • Custom Shop Systems
  • Payment Integration

Progressive Web Apps

Modern web applications with app-like functionality that work online and offline.

  • Offline Functionality
  • Push Notifications
  • App-like Experience

Frequently Asked Questions

FAQ about Web & Mobile Development

Technology & Platforms

Native or cross-platform – what do you recommend?

Native (Swift/Kotlin) for maximum performance and platform features. Cross-platform (Flutter/React Native) saves development time with one codebase. We advise based on your requirements and budget.

Which web frameworks do you use?

React and Next.js for most projects – stable, performant, well maintainable. Angular for complex enterprise applications. Vue.js when a lighter framework is preferable. Backend: Node.js, .NET, or Python.

Development Process

How does a typical project work?

Conception → UX/UI Design → Development in sprints → Testing → Launch → Support. You receive regular updates and can give feedback continuously.

Can we see the progress during development?

Yes, we work in sprints and provide access to a test environment. You see the app grow and can give feedback early – no surprises at the end.

Thorsten Frieling – Project Manager Groenewold IT Solutions

Plan app or web project? We discuss your requirements and develop a concrete concept and quote.

Schedule Consultation

Costs & Timeline

What does an app or web application cost?

A simple app starts at around 20,000 €, complex applications with backend, integrations and special features correspondingly higher. Web applications similar. Concrete quote after requirements analysis.

How long does development take?

MVP: 2-4 months. Larger applications: 4-9 months. Through agile development you have usable versions early and can go live step by step.

App Store & Maintenance

Do you also handle App Store publishing?

Yes, we support from screenshots and descriptions to the technical submission to Apple App Store and Google Play Store. Including guideline-compliant preparation.

What happens after go-live?

We offer maintenance contracts with updates, bug fixes, and further development. Many apps need regular updates for new OS versions – we take care of that.

Björn Groenewold – CEO Groenewold IT Solutions

Questions about development? We advise on technology, costs, and implementation – from experience with many app and web projects.

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Web and Mobile Development: Cross-Platform Solutions for Every Screen

The line between web and mobile has blurred considerably, and modern users expect seamless experiences regardless of how they access your services. Our development approach embraces this reality by building applications that feel native on phones, tablets, and desktops alike. Using technologies like React, Next.js, Flutter, and React Native, we create unified experiences that share business logic while respecting the unique interaction patterns of each platform.

Progressive Web Apps represent a compelling middle ground for many business scenarios. They deliver app-like experiences through the browser, complete with offline functionality, push notifications, and home screen installation, without the friction of app store submissions or platform-specific codebases. We have built PWAs for field service teams who need reliable access in areas with spotty connectivity, and for customer-facing applications where reducing the barrier to first use directly impacts conversion rates.

Native mobile development remains the right choice when applications need deep integration with device hardware, maximum performance, or must adhere to strict platform design guidelines. Our iOS developers work with Swift and SwiftUI, while our Android team leverages Kotlin and Jetpack Compose. For projects where budget and timeline favor a shared codebase, we use Flutter to deliver polished cross-platform apps that genuinely look and feel native on both operating systems without compromise.

Every web and mobile project we deliver includes responsive design as a non-negotiable foundation, not an afterthought. We follow mobile-first development principles, ensuring that interfaces work beautifully on small screens before progressively enhancing them for larger viewports. Accessibility standards like WCAG compliance are built into our design system, making your digital products usable by the widest possible audience while also improving search engine visibility and meeting increasingly strict regulatory requirements across European markets.

From Concept to Pixel: The UX Design Process

A successful digital product doesn't start with code – it starts with a thoughtful UX design process. We begin with wireframes and mockups that make information architecture and user flows tangible before a single line of code is written. Building on that foundation, we develop a consistent design system with reusable components, color palettes, and typography rules. This system ensures visual consistency across all screens while significantly accelerating development. Through targeted A/B testing we validate design decisions with data: which button color converts better? Which layout drives more interactions? The result is interfaces that don't just look good but measurably perform.

Rendering Strategies for Performance and SEO

Choosing the right rendering strategy directly impacts load times, search engine visibility, and user experience. With Server-Side Rendering (SSR) and Static Site Generation (SSG), we deliver pages that are fully rendered on the first request – ideal for SEO and perceived speed. Combined with a Headless CMS, editors get a comfortable backend for content management while the frontend operates as a decoupled application offering maximum performance and flexibility. Next.js allows us to mix SSR, SSG, and client-side rendering on a per-route basis – giving every page exactly the rendering strategy that's optimal for its purpose.

Mobile Features That Make the Difference

Modern mobile apps thrive on features that go beyond simply displaying content. Push notifications keep users actively engaged and enable time-critical communication – from order status updates to personalized offers. For companies with an international focus, we implement comprehensive internationalization (i18n): multilingual interfaces, localized date and currency formats, and culturally adapted content. And with Progressive Web Apps, we bring app-like experiences directly to the browser – including offline capability, home screen installation, and fast load times, all without the hurdles of app store submissions.

Frequently Asked Questions

Web & Mobile Development

Platform, Cost & Timeline

Native app or cross-platform – which is better for my project?

Native apps (Swift/Kotlin) offer maximum performance and access to all device features. Cross-platform (Flutter/React Native) enables faster development for iOS and Android with one codebase and lower costs.

What does a website or app cost?

Depends on scope. A professional website from €5,000–10,000 excl. VAT; web and mobile apps typically €20,000–80,000 excl. VAT. We give a transparent quote after requirements analysis.

How long does app development take?

Website: 4–8 weeks. Web app: 2–4 months. Mobile app: 3–6 months. We work agile with regular releases so you see results early.

Do you also handle App Store publishing?

Yes. We support from screenshots and descriptions to technical submission to Apple App Store and Google Play Store, including guideline-compliant preparation.

Can my app also work offline?

Yes. We build apps with offline functionality that store data locally and sync when online – important for field service or areas with poor coverage.

Björn Groenewold – Geschäftsführer Groenewold IT Solutions

Discuss your web or app project

We give a transparent quote after requirements analysis.

Book a call

Related Topics

Complementary Services from Other Areas

These services are frequently requested together with Web & Mobile Development or complement it thematically.

Integration & Interfaces

AI & Machine Learning

Consulting & Strategy

Your Next Step

Tell us briefly what you have in mind.

After your inquiry, we'll clarify open questions and give you a well-founded initial assessment.

30 min strategy call – 100% free & non-binding