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Paul Wellner Bou Software architecture & development.

Full-stack development across backend, frontend and infrastructure.

// about

20+ years across architecture, development, deployment and QA.

Focus on code quality, security, automation and clean APIs — taking full responsibility for a system, from architecture to operations.

Projects in media and news, public broadcasting, finance, e-learning, legal tech, healthcare and culture.

Degrees
  • Diplom-Mathematiker (FH)
  • Diplom-Betriebswirt (BA)
Certifications
  • Professional Scrum Master I (PSM I)
  • Sophora Certified Architect (SOCAR)
  • Sophora Certified Administrator (SOCAD)
Languages
German (native) · English (fluent) · Spanish (fluent)
// profiles
01 section

My projects.

open

BookmarCat

Bookmarks with browser plugins and mobile apps.

Go · Svelte · Swift
open

Get Feedback

Anonymous, no-account feedback after remote meetings & coaching.

Go · React
open

Noctua Mail

Web-based IMAP mail client.

TypeScript · Bun · Next.js · SQLite
open

Chord Charts

Build, hear, share and print chord diagrams for four-string instruments.

JavaScript · SVG · Web Audio
♪ open

Virtual Instruments

Sampled instruments and found sounds turned into playable virtual instruments.

Sampling · SF2/SFZ · DecentSampler · Kontakt
↻ open

Chronicreplay

Replays production logs as load tests; visualizes response-time deltas.

Java
⇆ open

API Comparator

CLI to diff API responses across environments.

TypeScript · Bun
△

AI Model Playground

Web UI for tweaking responses, context memory and parameters of llama.cpp models.

TypeScript · Bun · llama.cpp — wip
02 section

Roles.

/01 13+ years

Software & Solution Architect.

Architecture decisions, documentation, security, quality.

  • Solution architecture
  • Security architecture
  • Architectural documentation
  • Requirements engineering and refinement
  • Code reviews & quality assurance
  • Stakeholder communication
  • Lead development
// methods
  • arc42
  • C4
  • Code reviews
  • TDD
  • Clean Code
// stack
  • JVM (Java, Kotlin, Spring)
  • TypeScript & JavaScript
  • API Design
  • Architecture
  • Data & Search
/02 20+ years

Full-Stack Developer.

Web, mobile, APIs and services end-to-end.

  • Feature ownership end-to-end
  • Frontend + backend
  • API design and backend services
  • Database and search integration
  • Responsive web and mobile apps
  • Refactoring legacy code
  • Test automation
// methods
  • Scrum
  • Kanban
  • TDD
  • BDD
  • Clean Code
  • Code reviews
  • AI-assisted development
// stack
  • TypeScript & JavaScript (Node.js, Bun, React, Next.js, Vue.js)
  • JVM (Java, Kotlin, Spring, Groovy)
  • Python
  • Go
  • Git
  • Mobile (React Native, Expo, iOS, Android)
  • APIs (REST, GraphQL, OpenAPI)
  • Databases & Search (PostgreSQL, MySQL, MongoDB, Elasticsearch, Solr, Azure SQL)
  • Web UI (HTML & CSS, Material Design)
  • Containers (Docker, Kubernetes)
/03 12+ years

DevOps & Platform.

Automation, infrastructure as code, cloud.

  • CI/CD pipelines
  • Test & deployment automation
  • Containerization
  • Infrastructure as code
  • Operational responsibility
// methods
  • Continuous Integration
  • Test automation
  • Code reviews
// stack
  • Containers (Docker, Kubernetes, OpenShift)
  • Infrastructure as Code (Terraform, Ansible)
  • Cloud (AWS, Google Cloud, Azure, DigitalOcean)
  • CI/CD & Automation (GitLab CI, GitHub Actions, Jenkins, SonarQube, Shell)
/04 8+ years

Tech Lead & Mentor.

Teams, processes, training.

  • Technical leadership
  • Team leadership
  • Mentoring
  • Project management
  • Trainings & workshops
// methods
  • Scrum
  • Kanban
  • Code reviews
  • TDD