# Tobias Sittenauer ## Entrepreneur & Tech Enthusiast **Email:** tobias@sittenauer.eu **Phone:** +49 151 44238412 **Location:** Weihmichl, Germany **LinkedIn:** https://www.linkedin.com/in/tobias-sittenauer --- ## Summary Technology leader, entrepreneur, and hands-on software architect with a strong background in building and scaling software platforms. Currently serving as CTO at Careville, responsible for the end‑to‑end architecture, development, infrastructure, and operation of a SaaS platform in the healthcare sector. I combine strategic technology leadership with active software development, focusing on scalable architectures, cloud infrastructure, and high-quality engineering practices. Passionate about turning ideas into real products, building strong engineering teams, and solving complex technical challenges. --- # Professional Experience ## Careville, Chief Technical Officer **Aug 2023 – Present** Dingolfing, Germany ### Strategic Leadership & Technology Ownership - CTO with end‑to‑end responsibility for architecture, development, infrastructure, and operation of a healthcare SaaS platform - Building and scaling the software engineering team and establishing modern development processes - Defining and executing the technical strategy of the company - Driving the technological evolution of the platform with a focus on scalability, stability, and maintainability ### Software & Platform Architecture - Architecture and design of a multi-tenant SaaS platform for care management - Design of complex enterprise software for healthcare organizations including administration and billing workflows - Development of an integrated web and mobile platform using React Native - Migration from early product prototypes to production-ready enterprise systems - Architecture reviews, technical decision-making, and enforcement of engineering quality standards ### Hands-on Engineering - Active development of core platform components and backend services - Implementation of complex billing and accounting logic for German health and care insurance providers - Modeling of domain logic in a highly regulated healthcare environment - Supporting the engineering team through code reviews, architecture guidance, and technical problem solving ### DevOps, Cloud & Platform Operations - Design and operation of a cloud-native SaaS infrastructure - Building and maintaining modern CI/CD pipelines for automated build, test, and deployment workflows - Operation and administration of Managed Kubernetes (OVH) - Implementation of Infrastructure as Code and automated deployment strategies --- ## StackForge, Founder **2025 – Present** Weihmichl, Germany ### EU-sovereign products and open source - Founder of StackForge, building EU-sovereign, GDPR-native software products and open source. - @stackforge-eu/factur-x: open source TypeScript library for Factur-X, ZUGFeRD, and XRechnung e-invoicing (EUPL-1.2). - Pastely (pastely.eu): EU-hosted link-in-bio, short link, and digital business card platform. - Entrivia (entrivia.eu): visitor management for the DACH market with NIS-2 and ISO 27001 positioning. --- ## Voltane GbR, Managing Director **Jun 2021 – Present** Landshut Region, Germany ### Web Development & Custom Software - Full-stack web development for custom client solutions - Development of tailored software systems and web applications - Technical project management for client-specific IT projects ### IT Consulting & Architecture - Software architecture design including design patterns and technology stack selection - System architecture and integration of distributed systems and APIs - Enterprise IT architecture planning and technology roadmaps - Architecture reviews and technical assessments ### Consulting - Strategic IT consulting and technology recommendations for clients --- ## xpecto AG, Head of Development **Dec 2016 – Jul 2023** Landshut, Germany ### Technical Leadership & Product Development - Strategic development of the fintech platform xpectoPro and associated backend systems - Leadership of the development team responsible for xpectoPro and xpectoOnline - Technology modernization: migration of the customer portal from Python to React / Next.js - Development of a proprietary React v18 component library for standardized UI/UX ### Innovation & Process Optimization - Development and market launch of a no/low-code platform for individualized investment subscription processes - Introduction of code review processes to improve software quality and knowledge sharing - Adoption of modern frontend technologies to improve user experience ### Team & People Management - Technical and disciplinary leadership of the development team - Resource planning and project coordination --- ## xpecto AG, Software Developer **Dec 2012 – Nov 2016** Landshut, Germany ### Software Development & Product Engineering - Development and optimization of the fintech platform xpectoPro (formerly eAgentur) - Migration of the payment system from DTA to SEPA standard - Design and development of a digital shareholder meeting module including electronic voting capture - Development of a conversion tool for account number / bank code to IBAN / BIC - Implementation of IBAN checksum validation to improve data quality ### Customer Support & Projects - Onboarding and technical support for enterprise clients - Implementation of cross-industry custom development projects --- ## xpecto AG, Apprentice (Software Development) **Sep 2010 – Nov 2012** Landshut, Germany ### Final Project: Mechanical Turk Paper Form Scanner Development of an intelligent document processing system for digitizing handwritten form data. Key features: - OCR-based coordinate extraction of handwritten text from scanned forms - Automated workflow for distributing text fragments to Amazon Mechanical Turk - Integration of processed data back into the xpectoPro system - Quality management and coordination of the digitization workflow --- # Skills **Architecture & Engineering** - Software Architecture - Enterprise Application Design - SaaS Architecture - Multi-Tenant Systems - Domain-Driven Design **Cloud & Infrastructure** - Kubernetes - Cloud-Native Architectures - Infrastructure as Code - CI/CD Pipelines - DevOps **Development** - Full-Stack Development - React / Next.js - React Native - Backend Systems - API Design --- # Certifications - Professional Scrum Master I (PSM I) - Certified Associate in Project Management (CAPM) --- # Languages - German, Native - English, Full Professional Proficiency