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Web development and mobile apps – websites, PWAs and native apps
250+ projects · 5.0 on Google · 100% in Germany

Web and mobile delivery with one team, one backlog and measurable releases

For mid-sized companies: end-to-end journeys in the browser and on device—clear architecture and ownership – delivery and project ownership from Germany (Leer/East Frisia), named contacts, no offshore guesswork.

  • 250+ delivered projects
  • 5.0 stars on Google
  • 100% engineering in Germany

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

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, React Native, and .NET MAUI, 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 or React Native to deliver polished cross-platform apps that genuinely look and feel native on both operating systems without compromise. Where your stack is already Microsoft- and C#-centric, .NET MAUI is a strong fit for cross-platform delivery across mobile and desktop.

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.

Thorsten Frieling

How we get started together

Everything begins with an open conversation. You don't need finished plans—just tell us about your idea. We listen and find the right path together.

Thorsten Frieling – Project Management

Book a no-obligation consultation

Frequently Asked Questions

Web & Mobile Development

Quick answers

App or mobile website?

It depends on the use case. For reach, a website or PWA; for deep system integration and customer loyalty, often a native app.

Separate iOS and Android builds?

Usually not anymore. With Flutter or React Native we build one codebase for both platforms, which significantly reduces cost.

How do we keep the app up to date?

We offer maintenance contracts so your app stays stable even when new operating system versions ship.

Do you build backends as well?

Yes—we deliver full stack. The backend is often the more critical layer, because that’s where business logic and data live.

Technology & platforms

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

Native apps (Swift/Kotlin) offer maximum performance and full access to platform features. Cross-platform development with Flutter, React Native or .NET MAUI delivers one codebase for iOS and Android with shorter timelines and lower cost when your requirements fit. We recommend based on use case, budget and release plan.

Which web frameworks do you use?

We primarily use React and Next.js—stable, performant and maintainable. For complex enterprise applications we also use Angular; Vue.js where a lighter stack fits. Backends include Node.js, .NET and Python depending on integration and operations.

Development process

How does a typical project work?

Conception → UX/UI design → iterative development in sprints → testing → launch → support. You receive regular demos and can steer priorities continuously.

Can we see progress during development?

Yes. We work in sprints with access to a staging environment so you see increments early—no big-bang surprise at the end.

Costs & timelines

What does a website or app cost?

Scope-dependent. Professional websites often start around €5,000–10,000 excl. VAT; web and mobile apps typically €20,000–80,000 excl. VAT depending on backend and integrations. Simple apps frequently begin near €20,000; larger platforms cost more. We provide a transparent quote after requirements analysis.

How long does development take?

Indicative ranges: website about 4–8 weeks; web app roughly 2–4 months; mobile app commonly 3–6 months (MVPs often 2–4 months; larger programmes 4–9 months). Agile cadence means usable releases early so you can go live step by step.

Launch & operations

Do you also handle App Store publishing?

Yes—from screenshots and descriptions through technical submission to Apple App Store and Google Play, prepared to meet store guidelines.

What happens after go-live?

We offer maintenance with updates, fixes and further features. Mobile apps need ongoing OS and policy alignment—we plan that into operations.

Can my app also work offline?

Yes. We implement offline-capable apps that cache data locally and sync when online—important for field teams or unreliable connectivity.

Björn Groenewold – Managing Director Groenewold IT Solutions

ROI & cost clarity

When does a custom app pay off?

A tailored web or mobile app is an investment—it pays off when time savings, quality in core processes, and clean integration into your systems outweigh licensing costs or manual workarounds over the years. Leadership and IT need realistic ranges for budget and payback—not gut feelings—with the same rigour we apply to architecture and releases.

Use the ROI calculator for web and app development to relate investment, operating cost, and expected benefit—so you can have an honest conversation about fixed price, MVP scope, or long-term evolution from our team in East Frisia with clear milestones.

Björn GroenewoldManaging Director
Calculate ROI for web & app development →
Related topics for Web & Mobile Development

Everything you should know

Web and mobile often share APIs and authentication—yet release cadences and UX cycles differ. The articles below structure responsive web, PWAs and native apps for your audience.

All topics belong to Web & Mobile Development and cross-link where it makes sense.

Up to 50% of your investment via BAFA/KfW

Use our funding calculator to see which government grants may apply to your project.

Service cluster

Related services for Software & Platforms

Web and mobile are standard today—combined with custom software and CMS you build a strong digital presence.

Related topics

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

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Web & Mobile Development | Apps & Websites