--- title: "CV - Maximilian Flechtner | Maximilian Flechtner - App Entwickler" canonical_url: "https://robocitrus.com/en/cv" last_updated: "2026-07-19T00:11:14.935Z" locale: en meta: description: "Resume of Maximilian Flechtner - Senior Flutter Developer with expertise in GoLang, Kubernetes and scalable app systems. Projects: DragonBoat Hub (my own app for dragon boat teams, open beta), Hundeo (1M+ downloads), QUESS." "og:description": "Resume of Maximilian Flechtner - Senior Flutter Developer with expertise in GoLang, Kubernetes and scalable app systems. Projects: DragonBoat Hub (my own app for dragon boat teams, open beta), Hundeo (1M+ downloads), QUESS." "og:title": "CV - Maximilian Flechtner" "twitter:description": "Resume of Maximilian Flechtner - Senior Flutter Developer with expertise in GoLang, Kubernetes and scalable app systems. Projects: DragonBoat Hub (my own app for dragon boat teams, open beta), Hundeo (1M+ downloads), QUESS." "twitter:title": "CV - Maximilian Flechtner" --- RoboCitrus - Home ![Robocitrus](https://robocitrus.com/cdn-cgi/image/w=3840,f=png,q=75/images/small-logo.webp) ## Profile I'm a Flutter developer focused on mobile apps for iOS and Android. At Hundeo, I was solely responsible for the app over several years. Today it has over a million downloads and a 4.5-star rating. I also migrated the backend from PHP to GoLang with Kubernetes. I work on both greenfield projects and existing codebases. My tech stack includes Flutter with Bloc architecture, backend development with GoLang and Serverpod, as well as CI/CD and deployment. My projects span different industries: pet tech (Hundeo), mental health (QUESS), and construction (Bori Bau). I also build my own products, for example DragonBoat Hub. The app came out of my work as a dragon boat coach and is now in open beta on iOS, Android and the web. I work independently, keep commitments, and communicate openly when adjustments are needed. ## Current Projects Hundeo2025 – March 2026 RINACLA LTD | Freelance Developer Digital dog training app with 1M+ downloads and 4.5+ stars. After my employment ended, I continued working on the app as a freelancer. - User behavior analysis with PostHog and custom dashboards - Identified retention issues and shipped features to fix them - Built the AI chat and recommendation system with Python, automated user analytics - Ongoing development of app and GoLang backend FlutterBlocGoLangPythonPostHogAnalytics QUESS2025 – present METSys GmbH | Freelance Flutter Developer Mental health app based on kinesiology. Users can reflect on and answer inner conflicts and questions using a Bluetooth device. - Flutter app for iOS & Android with BLE communication - Built the entire backend with Serverpod - Real-time data transfer from device to app FlutterServerpodBluetooth LEPostgreSQL ## Other Small Projects DragonBoat Hub2025 – present · Open Beta My own app, built off the back of my work as a dragon boat coach. One-tap lineups, live tracking on the water, race admin. Free on iOS, Android and the web while the beta is open. FlutterServerpodiOS · Android · Web FootballHero2023 Gamification app for young football players. Kids complete real exercises designed by coaches and earn points for their virtual hero. Flutter Bori Bau2025 – 2026 Small craftsman app for a construction business: create jobs, track work hours, document with photos. FlutterServerpodPostgreSQL ## Work Experience Founder & Freelance DeveloperFeb 2023 – present Robocitrus / Medienagentur Maximilian Flechtner | Remote Own agency for app and web development. Clients include mental health, pet tech, and construction companies. FlutterServerpodGoLangNuxtPostgreSQL App DeveloperJuly 2022 – Dec 2024 Hundeo GmbH | Remote Solely responsible for the Flutter app of a digital dog training platform. Migrated the backend from PHP to GoLang with Kubernetes to handle future growth. The app now has over 1M downloads. FlutterBlocGoLangKubernetesDockerCI/CD Apprenticeship as IT SpecialistAug 2019 – July 2022 DevLabor | Salzwedel Dual vocational training focused on real client projects. Built my first Flutter apps, learned web development with Vue.js and Laravel. FlutterVue.jsLaravelWordPressPHP ## Certificates Humanoid AcademyFeb 2026 EF Robotics Hands-on course programming humanoid robots with Python. Covered motor control, sensors, and movement sequences. PythonRoboticsAI ## Education IT Specialist for Application Development Berufsbildende Schulen I, Lüneburg Aug 2019 – July 2022 Extended Secondary School Certificate Sekundarschule Theodor Fontane, Arendsee 2013 – 2019