HINTERLAND software Web design and software engineering

Multi-studio fitness platform for Sportsfreund Fitness GmbH, serving three locations across Germany. Built with Next.js and React 19 in TypeScript, integrating the Magicline API for real-time class booking, Klaviyo for marketing automation, and Cloudinary with Bunny Stream for media delivery. A Storybook component library and theme system ensure design consistency across studios.

A comprehensive website redesign for GIGA Hamburg, built as a Next.js monorepo with Contentful CMS and GraphQL. The platform features Algolia-powered search, Observable.js data visualizations, and React PDF generation for downloadable reports. Edge functions handle dynamic routing, while an interactive world map lets users explore the organization's global presence.

Corporate website for Conal GmbH, a systems partner for aluminium. Bold, high-contrast Next.js build spanning services, technology and industry solutions.

A modern booking and marketing website for HANSEKAI serviced apartments, built with Next.js and React. Features include responsive image carousels, JotForm-integrated booking and inquiry forms, and cookie-consent-compliant analytics. Contentful CMS powers all content, enabling the client to manage property listings, pricing, and promotional content across multiple languages.

A digital platform for VH Gruppe, a real estate company managing rental and sales properties. The site integrates the ImmoScout24 API for rental listings and Contentful CMS for sales properties into a unified browsing experience. Features include embedded Google Maps for location context, React PDF export for property exposés, and parallax scroll effects.

A portfolio website for Agentur Göschen, built with Gatsby and Material-UI for a polished, performant static site. Features include a React photo gallery for project showcases, Git-backed Netlify CMS for seamless content editing, and PurgeCSS optimization for minimal production bundle sizes.

Corporate website for Heid + Partner Immobilienmanagement GbR — a property management company based in Hamburg. Built with Gatsby and Contentful, featuring a modern design with property listings and contact forms.

A Gatsby-based static site with PWA support for a historic residential property in Lübeck. The site serves as a digital exposé replacing traditional PDF brochures, featuring interactive Google Maps integration for location exploration and optimized image loading for property photography. Built for performance and offline capability as a progressive web app.

As CTO of hermone, we built a hormone cycle awareness app combining a proprietary algorithm with D3.js data visualizations for personalized health insights. The React Native app uses encrypted MMKV storage for sensitive health data. The backend runs on AWS CDK with Lambda, AppSync (GraphQL), DynamoDB, and Cognito. An Nx monorepo with Detox end-to-end testing ensures code quality.

Offline-first app mapping 1,100+ mooring stations across Germany's waterways, including every Gelbe-Welle guest berth. Built with React Native/Expo — works without signal.

Native iOS journaling app built around a five-minute daily habit. Calm, typographic interface with guided prompts — reflection made effortless.

We are building an AI-powered insurance consultation platform using a multi-agent LLM architecture. The full-stack monorepo includes a Next.js frontend, a Mastra-based AI backend with OpenAI integration, and a React Native mobile app via Expo. Key features include real-time chat with agent handoff, automated coverage comparison, knowledge base ingestion, and observability through Langfuse.

Engaged to reduce infrastructure costs for an established insurtech platform, we restructured a multi-service architecture of accounting, claims, scheduling, and workflow services. The stack runs on Node.js microservices with PostgreSQL and MongoDB, orchestrated via Kubernetes with ArgoCD. We implemented CI/CD pipelines with contract testing, Elastic APM monitoring, and a partner portal frontend.

Led the migration of upday's multi-edition news platform from a legacy CMS to Contentful, architecting a system using Contentful's locale infrastructure to serve 12+ global editions. The Next.js frontend leverages Incremental Static Regeneration with webhook-driven cache invalidation. Infrastructure runs on Kubernetes with Terraform, while Contentful CLI handles schema migrations across editions.

Interactive worldmap visualization for the German Institute for Global and Area Studies (GIGA) in Hamburg. Features dynamic data visualization of research networks, projects, and partnerships across the globe.

A custom TypeScript CLI with 20+ commands for managing Contentful infrastructure at scale, built for upday's multi-edition news platform. The tooling automates content model migrations across 12+ global editions, deploys 13 custom Contentful apps with automated CI/CD, and manages RBAC across environments. GitHub Actions workflows use edition-matrix strategies for parallel deployments.

For a research project on Islamism, we developed a toolset that utilizes the Twitter API to categorize tweets into distinct groups. This technology enables scientists to conduct detailed analyses of topics and connections among Arab Islamists on Twitter.