Software architect · I build apps end to end — my own products, and yours.
Founder, software architect and author with 20+ years of engineering experience. I design, build and operate production software end to end: native iOS and macOS (Swift, SwiftUI), cross-platform (Flutter), and high-performance backends (Quarkus on Kubernetes). Based in Bad Nauheim, Germany.
I work under Berger & Rosenstock GbR — the Digital Freedom product brand, and The App Architect, where I build apps for clients.
Need an app built? Under The App Architect I take your idea from whiteboard to the App Store as a single accountable architect — fixed price, no agency overhead, and you own all the code.
theapparchitect.com → · Book a free call
Photograph a wine bottle and get a verdict matched to your taste profile — it trains itself from every confirmed match. Quarkus microservice mesh, OpenAI Vision label reading, taste-vector matching. Flutter app, iOS & Android. sommelio.app · App Store
AI-powered reporting for construction and field service. A photo or voice memo on site is transcribed, geocoded, analyzed and compiled into a structured, validated report — 45 minutes of evening paperwork become 90 seconds on site. Quarkus microservice mesh on Kubernetes, Kafka, OpenAI Whisper & Vision, PostgreSQL. Flutter app, iOS & Android. dokuai.app · App Store
AI-generated word puzzle game. Every hour the backend creates new puzzles — GPT-4o picks the words, DALL·E 3 generates the visual clues, everything translated into 8 languages. Global leaderboard, streak system, offline play. Quarkus backend, PostgreSQL. Flutter app, iOS. snapshots-quiz.app · App Store
Native macOS app for Civo Cloud — full CRUD, Kubernetes deep integration (live metrics, pods, logs), S3 file browser, firewall management, 8 languages. Swift 6, SwiftUI, zero dependencies. civo-cloud-manager.app · App Store · Source
- Seaworthy (TestFlight beta) — iOS maintenance log for boat owners with on-device AI
- Bucketeer — native macOS object-storage browser for 9+ providers (S3, R2, B2, Wasabi, …) with Finder mount and cross-provider sync
- PaperlessIQ — AI-native document management for iOS with on-device classification
- Pourenzo — AI bartender: photograph the spirits you own, get cocktails you can actually make
More — including full case studies — on marcelrgberger.com and theapparchitect.com.
Solopreneur — The Art of Working Alone — an honest account of indie development, a business shutdown, and the return to solo work.
Native macOS app for Homebrew: background auto-updates, a full Brew GUI for browsing and installing casks, and an AppSnapshot engine for backing up and migrating app data across Macs. Swift.
Claude Code plugin: control Apple Pages from Claude — create, edit, format and export documents via /pages. 100+ templates, PDF/Word/EPUB export, tables, images. Python.
Claude Code plugin for full Apple Numbers control via AppleScript — create spreadsheets, manage data, format cells, export to PDF/Excel/CSV. Shell.
Claude Code plugin: control WhatsApp from Claude — read chats, send messages, search, auto-reply, export conversations, monitor in real time. macOS only. Python.
Claude Code plugin: control Xcode from Claude — build, test, run, clean, manage simulators, schemes, projects and devices. 30+ commands via AppleScript + xcodebuild + xcrun. Python.
Single-file Python CLI for Atlassian Jira Cloud — issues, comments, transitions, attachments, links, agile boards and bulk operations. Standard library only, no dependencies.
Claude Code plugin for managing domains and DNS records via the INWX API. Python.
Ask a Pro — AI-powered document analysis with 85+ expert consultation roles for legal, medical, tax and professional advice. TypeScript.
Swift · SwiftUI · Flutter · Dart · Quarkus · Java · Kafka · PostgreSQL · Kubernetes · ArgoCD · Civo · GitHub Actions
- Client work — The App Architect
- Personal site — marcelrgberger.com
- LinkedIn · YouTube
- Email — hello@marcelrgberger.com