01 Services
Nine disciplines, one accountable engineer.
You work directly with the engineer who writes the code, from the AI integration to the server it runs on.
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01
AI Integration & AI Products
AI assistants, retrieval-augmented generation (RAG), document processing, and AI capabilities integrated into production applications.
- OpenAI
- Anthropic
- LangChain
- pgvector
- Python
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02
Cross-Platform Mobile App Development
Development of iOS and Android applications using React Native, Expo, and TypeScript, with shared codebases, platform-specific functionality, and offline capabilities where required.
- React Native
- Expo
- TypeScript
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03
Native iOS Development
Development of native applications for iPhone, iPad, and Apple Watch using Swift, SwiftUI, and modern Apple frameworks.
- Swift
- SwiftUI
- SwiftData
- XCTest
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04
Native Android Development
Development of native Android applications using Kotlin and Jetpack Compose, with attention to maintainable architecture, device compatibility, and performance.
- Kotlin
- Jetpack Compose
- Coroutines
- Room
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05
Web Development
Development of responsive websites and web applications with React, Next.js, and Astro, including custom WordPress themes and plugins.
- React
- Next.js
- Astro
- WordPress
- TypeScript
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06
API Development
Design and development of secure, well-documented APIs that connect applications, third-party services, and data sources.
- REST
- GraphQL
- OpenAPI
- OAuth 2.0
- Webhooks
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07
Backend Development
Development of backend systems, business logic, data models, payment integrations, and background processing tailored to application requirements.
- PHP / Laravel
- Swift / Vapor
- Java / Spring Boot
- PostgreSQL
- Redis
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08
DevOps & Hosting
Containerized environments, automated CI/CD pipelines, cloud infrastructure, and monitoring for application deployment and operation.
- Docker
- GitHub Actions
- AWS
- Hetzner
- Grafana
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09
Automation
Automation of business processes and repetitive tasks through custom workflows, AI agents, scheduled operations, and system integrations.
- Python
- Node.js
- Webhooks
- REST APIs
- GitHub Actions
02 Selected work
Recent projects, shipped and in use.
Products I designed, built and launched myself.
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Auftragspilot
Offline job, quote and invoice app
An iPhone and iPad app for self-employed professionals, tradespeople and small businesses in Austria, Germany and Switzerland. It manages customers, jobs, quotes and invoices, with EPC QR codes or Swiss QR-bills for payment, VAT handling including the small business exemption and reverse charge, and a weekly calendar. Everything runs offline on the device, with no server and no login.
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Beaver
Private PDF scanner and toolkit
An open-source PDF app for Mac, iPhone and iPad. Scan paper with the camera, turn photos into PDFs, merge, split and extract pages, export PNG or JPEG and run OCR. All processing happens on the device, without ads, accounts or tracking.
beaverpdf.app (opens in a new tab) Source on GitHub (opens in a new tab)
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PawGuard
Pet care tracker for cats and dogs
A pet care app with a health journal for vaccinations and therapy plans, care notes, medical records with photos and documents, and a shared calendar with reminders. Pets can be shared with family or a pet sitter, and vet-ready PDF health records can be exported. Available in five languages.
More open-source projects on GitHub, including Raven, an on-device document assistant for iPhone, iPad and Mac built on Apple’s Foundation Models framework (also on the App Store), and Cordon, a local ad and tracker blocker for macOS.
More on GitHub (opens in a new tab) Raven on the App Store (opens in a new tab)
03 Process
A clear process, from start to launch.
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0130 minutes
Intro Call
We discuss your project, target users, technical requirements, and business objectives. I assess the initial scope, identify risks, and we decide together whether I am the right fit for your project.
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021-2 weeks
Scope & Planning
We define the project scope, technical architecture, technology stack, deliverables, and milestones. You receive a written proposal outlining the development approach, estimated timeline, and pricing.
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03Weekly demos
Iterative Development
I deliver working software in short iterations, with regular progress updates, demos, and room for your feedback. Testing and code reviews are part of every iteration.
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04As agreed
Launch & Support
I handle deployment, release preparation, and technical handover, including App Store and Google Play submissions where applicable. Post-launch maintenance, updates, and support are provided within the agreed scope.
Let's build it.
Tell me what you are working on. You will receive a reply within 24 hours.