Migrating, creating, and maintaining B2B web services for customers, e.g. the Rechnungsbahnhof for Deutsche Bahn.

Implemented backend services for the Breitling online store, including product asset management (images, manuals, etc.) and order processing (payments, returns, etc.).

• Provide software development and consulting services for clients through the company.
• Manage client communication, requirements analysis, and delivery of technical solutions in a cross-border business environment.
• Handle all operational responsibilities including invoicing, accounting and tax compliance.
• Design and implement internal tools for project, development, and company management.
• Develop prototypes for applications, including system design and UI/UX elements.

• Design, realization, quality assurance, presentation and maintenance of the roster planning desktop application OC:Planner
• including controlling features with the dashboard or by creating reports with OC:Report Writer,
• the self-service web application OC:MyPlan (e.g. for requesting vacations)
• and associated REST services (e.g. OC:MyCalendar to access the schedule on phone calendar apps),
• especially the time recording and management service OC:Time
• and also specialty modules for particular types of customers like the Tagesdienstplan providing daily (instead of weekly/monthly/yearly) view of the duty roster for staffing of rescue vehicles in the fire department.

1. Major: Mathematics
2. Minor: Computer Science

The university processes proved unsuitable for autistic people, so I dropped out.

• 🇩🇪 German (native) → https://de.dame.software/cv/
• 🇺🇸 English (C2, bilingual)
• 🇫🇷 French (B2, professional proficiency) → https://fr.dame.software/cv/

1. Programming languages:
   1. .NET (C#, VB.NET, F#.NET)
   2. JVM (Java, Kotlin, Scala, Groovy)
   3. C/C++
   4. Python
   5. Delphi/Pascal
   6. Matlab
   7. Lisp
   8. Scheme
   9. Haskell
   10. Erlang / Elixir
   11. Prolog
   12. Rust
   13. Dart
   14. Golang
   15. OCaml
   16. Clojure
   17. Ruby
   18. PHP
2. Backend frameworks:
   1. Spring Boot
   2. Quarkus
   3. Hibernate
   4. JPA
   5. ASP.NET Core
   6. Entity Framework
   7. Pydantic
   8. FastAPI
   9. Uvicorn
   10. Ariadne
   11. SQLAlchemy
   12. Flask
   13. Django
   14. Node.js
   15. Express
   16. NestJS
   17. Ruby on Rails
3. Frontend:
   1. React
   2. Vue.js
   3. Angular (SSR/Angular Universal)
   4. JavaScript
   5. TypeScript
   6. UI/UX Design
   7. Blazor
   8. eCharts
   9. Charts.js
   10. HTML5
   11. CSS3
   12. SCSS
   13. Tailwind CSS
   14. Bootstrap
   15. Material Design
   16. DOM manipulation
   17. responsive design
   18. media queries
   19. component-based design
   20. Frontend state management (Pinia, NgRx Store, Redux)
   21. reactive programming (RxJS)
   22. browser debugging
   23. Webpack
   24. Vite
   25. esbuild
   26. WebAssembly
   27. Electron
   28. JSP
   29. accessibility (WCAG, WAI-ARIA)
4. Data Storage:
   1. database design
   2. SQL
   3. Postgres
   4. Microsoft SQL Server
   5. Oracle
   6. MySQL
   7. MariaDB
   8. normalization
   9. indexing
   10. query optimization
   11. data modeling
   12. NoSQL storage (DynamoDB, MongoDB, Redis)
   13. data warehouse
   14. ACID
5. APIs:
   1. RESTful APIs
   2. GraphQL (Hasura, Apollo)
   3. API authentication and authorization (JWT, OAuth)
   4. HTTP methods and status codes
   5. API documentation and schema design (Swagger, OpenAPI)
   6. serialization / deserialization
   7. gRPC
   8. XML-RPC
6. Testing:
   1. test automation / automated testing
   2. NUnit
   3. xUnit
   4. GTest
   5. Karma
   6. Jasmine
   7. Selenium
   8. Playwright
   9. Cypress
   10. Puppeteer
   11. Pytest
   12. JUnit
   13. mockito
   14. Cucumber
   15. unit tests
   16. integration tests
   17. end to end tests
   18. manual tests
   19. load tests
   20. test coverage
7. Desktop:
   1. WinForms
   2. DevExpress
   3. WPF
   4. MFC
   5. AWT
   6. GTK+
   7. Qt
   8. tk
   9. wxWidgets
   10. GUI design patterns
8. Mobile:
   1. Flutter
   2. .NET MAUI
   3. Ionic
   4. React Native
   5. cross-platform development
9. 3D:
   1. Three.js
   2. Unity
   3. Godot
   4. OpenSCAD
   5. OpenGL Shading Language (GLSL)
   6. scene graph concepts
   7. materials, lighting, and shading
   8. 3D transformations (matrices, projections)
   9. camera systems
   10. collision detection
   11. physics engines
   12. 3D printing
10. Cloud:
    1. cloud platforms
    2. AWS
    3. Azure
    4. GCP
    5. serverless architecture (AWS Lambda, GCP Functions)
    6. cloud storage concepts (AWS S3, MinIO, Firebase)
    7. messaging queues (AWS SQS Messaging Queue)
    8. cloud service models (SaaS, IaaS)
    9. Infrastructure as Code (IaC)
    10. Secrets management / key rotation / environment variables (AWS Secrets Manager)
11. Development tools:
    1. Version management
    2. branching strategies
    3. Git
    4. GitLab
    5. GitHub
    6. Subversion
    7. Atlassian Jira
    8. Atlassian Confluence
    9. Atlassian BitBucket
    10. Continuous Integration (CI)
    11. Continuous Delivery (CD)
    12. Continuous Deployment (CD)
    13. CI/CD pipelines
    14. GitHub Actions
    15. Jenkins
    16. containerization and orchestration (Docker, Kubernetes)
    17. Nginx
    18. virtual machines (VMWare, QEMU)
    19. ngrok
    20. Visual Studio
    21. Visual Studio Code
    22. IntelliJ IDE
    23. Eclipse
    24. Chrome Dev Tools
    25. Linux
    26. Unix
    27. BSD
    28. MacOS
    29. Windows
    30. Poetry
    31. pip
    32. MyPy
    33. Ruff
    34. NuGet
    35. Postman
    36. build automation (make, cmake, gradle, maven)
    37. Figma
12. Formats:
    1. JSON
    2. XML
    3. CSV
    4. TSV
    5. YML
    6. Markdown
    7. PDF
    8. SOAP
    9. LaTeX
13. Network Protocols:
    1. DNS
    2. SMTP
    3. POP3
    4. IMAP
    5. MIME
14. Development process:
    1. Coordination, specification, effort estimation, design, implementation, test and documentation of user stories, errors, interfaces, processes, configurations, development methods
    2. TDD
    3. BDD
    4. DDD
    5. prototyping
    6. wireframing
    7. agile development
    8. Scrum
    9. Kanban
    10. Scrumban
    11. stand-up
    12. retrospective
    13. code review
    14. pull request workflows
    15. GitFlow
    16. pair programming
    17. defensive programming
    18. profiling
    19. benchmarking
    20. project management
    21. requirements engineering
    22. estimation
    23. UML / diagramming
    24. clean code
    25. refactoring
    26. code smells
    27. technical documentation
15. Architecture:
    1. Software architecture
    2. clean architecture
    3. hexagonal architecture
    5. Microservices
    6. Event-driven architecture (EDA)
    7. CQRS
    8. Service-oriented architecture (SOA)
    9. Domain events / Event sourcing
    10. Internationalization (i18n), Localization (l10n)
    11. MVVM Design Pattern (Model View ViewModel)
    12. ORM
    13. MVC
    14. dependency injection
    15. SOLID
    16. separation of concerns
    17. N-tier architecture
    18. Dependency inversion / Inversion of Control (IoC)
    19. Repository pattern / Unit of Work pattern
    20. Adapter / Port pattern
    21. API-first design
    22. scalability
    23. modularity
    24. distributed systems
16. Programming paradigms:
    1. object-oriented programming (OOP)
    2. typed languages
    3. functional programming
    4. procedural programming
    5. scripting
    6. memory management
    7. asynchronous programming
    8. concurrency/multithreading
    9. event-driven programming
17. Security:
    1. OWASP top 10 awareness
    2. HTTPS/TLS
    3. CORS
    4. CSRF/XSS protection
    5. Role-based access control (RBAC)
18. Services:
    1. monitoring and logging (DataDog, Grafana)
    2. LLM (OpenAI, Azure GPT, Realtime API, Groq)
    3. STT (Speech to Text, ASR)
    4. Google STT
    5. TTS (Text to Speech)
    6. Deepgram
    7. 11Labs (Elevenlabs)
    8. Langfuse
    9. Algolia
    10. PicturePark
    11. CPI
    12. SAP
    13. Salesforce
    14. payment processing (Riskified, Adyen, Klarna, iDEAL, ApplePay)
19. Communication:
    1. Google Meet
    2. Google Mail
    3. Microsoft Teams
    4. Outlook
    5. Slack
    6. Mattermost
    7. GoTo Meeting
    8. Webex
    9. Google Docs / Microsoft Word / LibreOffice Writer
    10. Google Sheets / Microsoft Excel / LibreOffice Calc
    11. Microsoft Powerpoint