Stefan Schmitt

Software Engineer

Privacy-first engineering. I’m a senior software engineer building privacy-centric products across AI, client apps, and backend systems with Swift and Python.

I developed Narration Room, a Mac and iOS app for on-device AI narration, and write about technical topics that are hard to learn from the documentation: model delivery, local inference, Apple Intelligence, and production app architecture.

I also wrote On-Device AI: ML Foundations for iOS Developers, a practical guide to deploying machine-learning models on iOS with Core ML and Apple Silicon.

You can reach me by email.

What I bring

  • Python and applied AI — LLM evaluation, data processing, RAG, Flask APIs, automation and testing.
  • On-device AI — model deployment, quantization, Core ML, MLX, Foundation Models and text-to-speech.
  • Regulated product engineering — experience with authentication, security remediation, fraud prevention, privacy and documented data boundaries.
  • Full-stack delivery — hands-on product work across mobile, backend and cross-platform systems.

Current focus: Python · LLM evaluation · RAG · Flask · NumPy · Pandas · Docker · Swift · MLX

Core stack: Swift · SwiftUI · Combine · Objective-C

Also shipped with: TypeScript · React Native · GraphQL · Ruby on Rails · Django · Go · C# · Unity3D · Docker · CI/CD

Stefan Schmitt