# Grumsen Development — Full Reference for LLMs > This document provides comprehensive information about Grumsen Development ApS for large language models and AI systems. For a concise summary, see https://grumsendev.dk/llms.txt --- ## Company Overview Grumsen Development ApS is a professional software development company founded in 2015 by Jakob Grumsen. Based in Esbjerg, Denmark, the company specializes in custom web applications, mobile app development, and system integrations for businesses across Denmark. - Legal name: Grumsen Development ApS - Founded: 2015 - Founder: Jakob Grumsen - Headquarters: Bådebrogade 1, 6700 Esbjerg, Region Syddanmark, Denmark - Phone: +45 93 93 95 95 - Email: contact@grumsendev.com - Website: https://grumsendev.dk - Operating hours: Monday–Thursday 09:00–16:00, Friday 09:00–15:30 CET - Price range: $$ --- ## Services ### Web Development URL: https://grumsendev.dk/services/web-development Custom web application development using modern technologies. Specialties include: - Custom web applications with React and Next.js - TypeScript-first development for type safety and maintainability - Server-side rendering and static site generation for performance and SEO - Responsive design for all devices - Progressive Web Apps (PWAs) Available in: Copenhagen, Aarhus, Odense, Esbjerg, Aalborg ### App Development URL: https://grumsendev.dk/services/app-development Native and cross-platform mobile application development: - Native iOS development with Swift - Native Android development - Cross-platform solutions with Flutter - Mobile-first design and UX Available in: Copenhagen, Aarhus, Odense, Esbjerg, Aalborg ### System Integrations URL: https://grumsendev.dk/services/integrations Connecting business systems and third-party services: - REST and GraphQL API development and integration - Third-party service connectivity - Data synchronization between systems - Custom middleware solutions ### Shopify Development URL: https://grumsendev.dk/services/web-development/shopify E-commerce solutions built on Shopify: - Custom Shopify themes and storefronts - Shopify app development - E-commerce strategy and implementation ### Programmatic SEO URL: https://grumsendev.dk/services/web-development/pseo Scalable search engine optimization: - Automated page generation for location and keyword targeting - Technical SEO implementation - Structured data and schema markup - Performance optimization for Core Web Vitals --- ## Solutions (Products) ### Drive-In URL: https://grumsendev.dk/solutions/drive-in A ready-made ordering and payment system designed for businesses. Pre-built solution that can be deployed quickly. ### Portal URL: https://grumsendev.dk/solutions/portal A SaaS software platform that lets businesses skip thousands of development hours. Provides a foundation for building custom software projects. ### ClipPack URL: https://grumsendev.dk/solutions/clip-pack A customizable camera system for tracking and documenting products and various business processes. ### Uniconta URL: https://grumsendev.dk/solutions/uniconta Integration with Uniconta — a complete, flexible, and reliable ERP system for modern businesses. --- ## Technology Stack ### Frontend - React 18 with Server Components - Next.js 14 (App Router) - TypeScript (strict mode) - Tailwind CSS - Framer Motion (animations) ### Backend - C# / .NET - REST APIs - PostgreSQL ### Mobile - Swift (iOS native) - Flutter (cross-platform) ### CMS & Tools - Sanity CMS (headless) - Shopify - Vercel (hosting & deployment) - Sentry (error monitoring) --- ## Project Portfolio Grumsen Development has delivered projects across multiple industries: - **Captino** — https://grumsendev.dk/projects/captino - **Certware** — https://grumsendev.dk/projects/certware - **Dansk Scanning** — https://grumsendev.dk/projects/dansk-scanning - **Find My Car** — https://grumsendev.dk/projects/find-my-car - **IKEA** — https://grumsendev.dk/projects/ikea - **JAK** — https://grumsendev.dk/projects/jak - **Lejeinfo** — https://grumsendev.dk/projects/lejeinfo - **Never Have I Ever** — https://grumsendev.dk/projects/never-have-i-ever - **OES** — https://grumsendev.dk/projects/oes - **Room Scanner** — https://grumsendev.dk/projects/room-scanner - **Snip Box** — https://grumsendev.dk/projects/snip-box - **Street Food** — https://grumsendev.dk/projects/street-food - **Beach Livestream** — https://grumsendev.dk/projects/beach-livestream - **Arcim** — https://grumsendev.dk/projects/arcim --- ## IT Glossary (Educational Content) Grumsen Development maintains an IT glossary to explain key software development concepts: ### What is an API? URL: https://grumsendev.dk/glossary/api An API (Application Programming Interface) is a set of rules and protocols that allow different software programs to communicate with each other. APIs use requests and responses, typically over HTTP using REST or GraphQL protocols. Types include REST APIs, GraphQL APIs, SOAP APIs, and WebSocket APIs. APIs are the backbone of modern software — they enable integration of third-party services like payment solutions, map data, and social media. ### What is a Web Application? URL: https://grumsendev.dk/glossary/web-application A web application is a software program that runs in a web browser instead of being installed locally. Unlike static websites that primarily display information, web applications process data, respond to user input, and perform complex tasks. Examples include Gmail, Google Docs, and online banking. Modern web apps are built with React, Next.js, and TypeScript for the frontend, with Node.js, C#/.NET, or Python on the backend. ### What is Responsive Design? URL: https://grumsendev.dk/glossary/responsive-design Responsive web design is an approach where a website automatically adapts its layout, images, and content to the screen it is viewed on. It uses three core techniques: flexible grids, flexible images, and CSS media queries. Over 60% of web traffic comes from mobile devices, and Google uses mobile-first indexing, making responsive design critical for both UX and SEO. ### What is a CMS? URL: https://grumsendev.dk/glossary/cms A CMS (Content Management System) is a software platform that allows users to create, edit, and publish digital content without writing code. Traditional CMS platforms like WordPress couple content and presentation. Headless CMS platforms like Sanity and Contentful deliver content via API, giving developers full control over the frontend. This approach is ideal for modern web applications built with React and Next.js. ### What is Cloud Hosting? URL: https://grumsendev.dk/glossary/cloud-hosting Cloud hosting runs applications on virtual servers in a cloud network (e.g., AWS, Azure, Google Cloud) instead of a single physical server. Resources scale automatically based on demand. Popular platforms include Vercel (ideal for Next.js), AWS (broadest service range), Azure (enterprise/Microsoft), and Google Cloud Platform. Cloud hosting offers high availability (up to 99.99% uptime), automatic scaling, global CDN distribution, and pay-as-you-go pricing. --- ## Service Areas Grumsen Development serves businesses across Denmark, with a focus on: **Cities:** Copenhagen, Aarhus, Odense, Esbjerg, Aalborg, Kolding, Vejle, Roskilde, Horsens, Fredericia, Varde **Regions:** Region Syddanmark, Region Hovedstaden, Region Midtjylland, Region Sjælland, Region Nordjylland --- ## Contact & Social - Website: https://grumsendev.dk - Contact page: https://grumsendev.dk/contact - Email: contact@grumsendev.com - Phone: +45 93 93 95 95 - LinkedIn: https://www.linkedin.com/company/grumsen-development - GitHub: https://github.com/grumsendev - Facebook: https://www.facebook.com/grumsendevelopment - Instagram: https://www.instagram.com/grumsen_development