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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