Freelancer profile translated to English.
Back to original languageAbout Markus
Hi, I am a software developer & entrepreneur with over 12 years of experience.
I have already developed dozens of apps for iOS, Android, Web, macOS, and Windows.
From the initial idea to publication in the stores. Whether for start-ups or large companies: I accompany projects from A to Z.
What I do:
• Complete app development (Frontend + Backend)
• UI/UX design, implementation & deployment
• Scalable server architecture & cloud solutions
• Analysis & performance optimization
• AI agents & automated workflows
• RAG systems (e.g. for chatbots with knowledge base)
• Text and voice chats with LLMs (e.g. OpenAI, Claude)
I work quickly, reliably, and think along. From prototype to live system.
English
Fluent
German
Native or bilingual
Remote only
Primarily works remotely
Experience
- Nearay GmbHCTOSOCIAL NETWORKSOctober 2024 - September 2025 (11 months)Berlin, GermanyFull-stack development of a cross-platform appFor the Nearay project, I realized the complete technical implementation. From the mobile app to the CMS to the server architecture.Flutter App (iOS & Android)Development of a high-performance app with features such as:• Story Viewer & Editor• In-App Chat• QR code verification• Radio player• Push NotificationsWeb & CMSCross-platform CMS for easy management of content and users via app and web.Backend & Server Architecture (Serverpod)• Development of a scalable backend with Serverpod• API interfaces (REST & Websocket), authentication, data models• Server architecture & hosting on scalable cloud infrastructure• Implementation of fail-safe operation, automatic backups and monitoringStripe IntegrationPayment processing with Stripe for subscriptions and in-app purchases.A stable, maintainable platform with modern UI/UX, secure backend and full control over content & user interactions.
- SwissSign AGSoftware DeveloperTELECOMMUNICATIONSJuly 2023 - December 2023 (6 months)Opfikon, SwitzerlandSwissID AppNew development with Flutter & focus on securityFor this project, I helped to technically re-implement the existing SwissID app. With a modern Flutter stack instead of Xamarin.Forms.Flutter App (iOS & Android)New development of the SwissID app with a focus on usability and security:• Support for multiple user accounts• Two-factor authentication (2FA)• Push notifications for login and security processesTechnical optimization• Implementation of a robust error handler• Integrated logging system for better error analysis and maintenance
- run4planet GmbHSoftware DeveloperSPORTSSeptember 2022 - February 2025 (2 years and 6 months)Potsdam, GermanyMobile App & Platform for Charity RunsFor this project, I took over the complete technical development. From the mobile app to the server infrastructure.Flutter App (iOS & Android)Development of an intuitive app with functions such as:• Live map view for running routes• Push Notifications & Deep Linking• Donation tracking and user managementCMS & Admin PanelA central CMS implemented in Flutter for easy management of projects, teams, participants and content.Backend with C# & GraphQL• Development of a high-performance backend based on .NET & GraphQL• Data management, authentication, event logic• Own server infrastructure for hosting & operationServer Architecture & Infrastructure• Building a stable, scalable infrastructure• Setting up monitoring, fail-safe operation and backups
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Education
- Bachelor Applied Computer ScienceTechnische Hochschule Brandenburg2013