--- title: Projects description: "Successful projects by Maximilian Flechtner - From apps with thousands of users to conversion-optimized websites. Hundeo, Fussballhero, Wasserradler and more." canonical_url: "https://robocitrus.com/en/projects" locale: en meta: "og:description": "Successful projects by Maximilian Flechtner - From apps with thousands of users to conversion-optimized websites. Hundeo, Fussballhero, Wasserradler and more." "og:image": "https://robocitrus.com/_og/d/c_NuxtSeo%2Ctitle_Projects%2Cdescription_~U3VjY2Vzc2Z1bCBwcm9qZWN0cyBieSBNYXhpbWlsaWFuIEZsZWNodG5lciAtIEZyb20gYXBwcyB3aXRoIHRob3VzYW5kcyBvZiB1c2VycyB0byBjb252ZXJzaW9uLW9wdGltaXplZCB3ZWJzaXRlcy4gSHVuZGVvLCBGdXNzYmFsbGhlcm8sIFdhc3NlcnJhZGxlciBhbmQgbW9yZS4%2Cp_Ii9lbi9wcm9qZWN0cyI%2Cs_e81TcGhJJbplBCC2.png" "og:image:height": "600" "og:image:type": image/png "og:image:width": "1200" "og:title": Projects "twitter:image": "https://robocitrus.com/_og/d/c_NuxtSeo%2Ctitle_Projects%2Cdescription_~U3VjY2Vzc2Z1bCBwcm9qZWN0cyBieSBNYXhpbWlsaWFuIEZsZWNodG5lciAtIEZyb20gYXBwcyB3aXRoIHRob3VzYW5kcyBvZiB1c2VycyB0byBjb252ZXJzaW9uLW9wdGltaXplZCB3ZWJzaXRlcy4gSHVuZGVvLCBGdXNzYmFsbGhlcm8sIFdhc3NlcnJhZGxlciBhbmQgbW9yZS4%2Cp_Ii9lbi9wcm9qZWN0cyI%2Cs_e81TcGhJJbplBCC2.png" --- > Index of every page on this site: [llms.txt](https://robocitrus.com/llms.txt) **Portfolio** # **My **Projects I'm not just the person writing code 💻 I think along, bring my own ideas, and stick with it until the result is right. Every project here shows how I worked with my clients to turn ideas into real products 🚀 *When I see real people using the things I built, I know why I do this 🙌 Whether it's an app, a backend, or an entire system, what drives me is solving problems and building things that work and that people actually enjoy using ✌️* **— Maxi** [**In-House Product – App, Web & Backend**

**DragonBoat Hub**

My own app for dragon boat teams: lineup, live tracking and race admin. Open beta on iOS, Android and the web.**Flutter****Serverpod****Full-Stack Dart****iOS · Android · Web****Open Beta****Eigenes Produkt**](https://robocitrus.com/en/projects/dragonboat-hub) [**App, Web & Backend Development**

**Hundeo**

AI-powered dog training app with over 500 tricks, personalized training plans, and an active community. Thousands of satisfied users train daily with Hundeo.**Flutter****KI-Integration****GoLang Backend****Microservices**](https://robocitrus.com/en/projects/hundeo) [**App & Backend Development**

**QUESS**

Bluetooth device and app that make gut feelings measurable. With smart AI for even better results.**Flutter****Bluetooth/BLE****Serverpod****Full-Stack Dart**](https://robocitrus.com/en/projects/quess) [**Ecosystem: App, Web Dashboard & Backend**

**Baustellenplaner**

Complete ecosystem for fiber optic construction: Mobile app (Android & iOS), web dashboard, and backend from one codebase. Digital construction documentation, crew planning, and order management.**Flutter****Serverpod****Full-Stack Dart****Offline-First****Ecosystem**](https://robocitrus.com/en/projects/baustellenplaner) [**Web Design, Development, Content Creation & Hosting**

**Wasserradler**

Modern company website for water bicycle rental. With user-friendly design and intuitive booking functionality, optimized for mobile devices.**Vue.js/Astro****Tailwind CSS****SEO****Hosting**](https://robocitrus.com/en/projects/wasserradler) [**Web Development and Backend**

**ImmoPlanet Schellenberg**

Professional company website for a skilled trades business in Dortmund. Project portfolio, services overview, and contact form with Go backend.**Nuxt 4****Go Backend****Tailwind CSS****SEO**](https://robocitrus.com/en/projects/immoplanet) [**App Development & Design**

**Fussballhero**

Gamification app for young footballers. Transforms real training performances into virtual achievements and motivates through challenges, rankings and social features.**Flutter****Firebase****Gamification****MVP**](https://robocitrus.com/en/projects/fussballhero) [**Web Design & Development**

**Drachenbootevents**

Landing page for dragon boat events in Berlin and Potsdam. Conversion-optimized for team events with clear call-to-actions and mobile-first design.**PHP****Bootstrap****SEO****Hosting**](https://robocitrus.com/en/projects/drachenbootevents) ## **Let's Connect! 🚀** ### **Ready for your next project? **
** Let's get started!** ![Maximilian Flechtner - Gründer](https://robocitrus.com/cdn-cgi/image/w=3840,f=png,q=75/images/about-me-maximilian-image.webp) #### **Maximilian Flechtner ** [flechtner@robocitrus.com](mailto:flechtner@robocitrus.com) [ +49 0176 41766223](tel:+4917641766223) ### **Let's get started** Tell me about your vision – just drop me an email or use the contact form. Let's plan your digital success together! 💪 [Send me an email](mailto:flechtner@robocitrus.com) [Contact Form](https://robocitrus.com/en/kontakt) ```json {"@context":"https://schema.org","@graph":[{"@id":"https://robocitrus.com/en#website","@type":"WebSite","description":"App Entwickler & Full-Stack Experte aus Deutschland. Ich baue skalierbare Apps, Backends und komplette Startup-Systeme mit Flutter, Go und Kubernetes.","inLanguage":"en-US","name":"Maximilian Flechtner - App Entwickler","url":"https://robocitrus.com/en","publisher":{"@id":"https://robocitrus.com/#identity"},"translationOfWork":{"@id":"https://robocitrus.com/#website"}},{"@id":"https://robocitrus.com/projects#webpage","description":"Successful projects by Maximilian Flechtner - From apps with thousands of users to conversion-optimized websites. Hundeo, Fussballhero, Wasserradler and more.","inLanguage":"en-US","name":"Projects","url":"https://robocitrus.com/projects","@type":["WebPage","CollectionPage"],"breadcrumb":{"@id":"https://robocitrus.com/projects#breadcrumb"},"isPartOf":{"@id":"https://robocitrus.com/en#website"},"potentialAction":[{"@type":"ReadAction","target":["https://robocitrus.com/projects"]}],"primaryImageOfPage":{"@id":"https://robocitrus.com/#logo"}},{"@id":"https://robocitrus.com/#identity","@type":"Organization","alternateName":"Robocitrus","description":"App Entwickler & Full-Stack Experte aus Deutschland. Spezialisiert auf skalierbare Apps, Backend-Systeme und komplette Startup-Lösungen mit Flutter, GoLang und Kubernetes. Von der Idee bis zum Launch - alles aus einer Hand.","email":"flechtner@robocitrus.com","name":"Maximilian Flechtner - App Entwicklung","telephone":"0176 41766223","url":"https://robocitrus.com","address":{"@type":"PostalAddress","streetAddress":"Leppiner Dorfstraße 60","addressLocality":"Arendsee","addressRegion":"Sachsen-Anhalt","postalCode":"39619","addressCountry":"DE"},"contactPoint":{"@type":"ContactPoint","telephone":"0176 41766223","email":"flechtner@robocitrus.com"},"logo":{"@id":"https://robocitrus.com/#logo"}},{"@id":"https://robocitrus.com/projects#breadcrumb","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","name":"Projects","position":1}]},{"@id":"https://robocitrus.com/#logo","@type":"ImageObject","caption":"Maximilian Flechtner - App Entwicklung","contentUrl":"https://robocitrus.com/images/large-logo.webp","inLanguage":"en-US","url":"https://robocitrus.com/images/large-logo.webp"}]} ``` ## Sitemap See the full [sitemap](https://robocitrus.com/sitemap.md) for all pages.