# Boris Niehaus - Freelance AI Mobile App Developer, Berlin

> Boris Niehaus is a senior freelance mobile app developer and AI integration specialist based in Berlin, Germany. He helps startups and agencies ship AI features into their Flutter, iOS, and Android apps - RAG/LLM integration, ML-powered features, and computer vision - without hiring a full ML team. Available for freelance contracts.

## Positioning

Boris combines 4+ years of professional app development with hands-on machine learning. The differentiator: many developers build Flutter apps, far fewer can also productionize ML/LLM features. He builds RAG pipelines, AI agents, and embedding-based search on Supabase/Postgres (pgvector) - the kind of intelligent features most mobile teams lack in-house.

## Professional Background

Boris has 4+ years of professional app development experience and works as a Tech Lead & Developer on a production Flutter app with a Supabase backend, ML-powered recommendations via vector search, and a SvelteKit admin interface. He is a graduate of Le Wagon's 7-month Data Science & AI Bootcamp (a bonus on top of his senior practice). Available for freelance projects alongside his full-time role.

## Services Offered

- AI/ML Integration: Adding machine learning models and intelligent features to existing mobile or web apps
- LLM/RAG & AI Agents: AI agents, RAG pipelines, semantic search, and eval-driven LLM features
- Custom Mobile Apps: Native iOS (Swift/SwiftUI), Android (Kotlin), or cross-platform Flutter apps from concept to App Store
- Data Pipelines & Automation: Scraping, ETL, scheduled jobs, and API integrations
- Telegram Bots & Automation: Custom Telegram bots - LLM-powered chat assistants, keyword alerts, scheduled notifications, and channel monitoring
- Prototyping & MVPs: Quick proof-of-concept builds to validate ideas before committing to full development

## Tech Stack

- Mobile: Swift, SwiftUI, Kotlin, Flutter
- AI/ML: Python, TensorFlow, Keras, scikit-learn, LangChain, Hugging Face, Transformers, RAG, Model Context Protocol (MCP), Groq
- Data: SQL, Pandas, NumPy, Streamlit
- Backend: TypeScript, FastAPI, Supabase, Postgres, pgvector, Docker, REST APIs, Telegram Bots, Cloud Deployment
- Monetization & Tooling: RevenueCat, StoreKit (Apple in-app purchases), Google Play Billing, Intercom
- Design: Figma, Photoshop, Lightroom

## Location & Availability

- Based in: Berlin, Germany
- Availability: Available immediately, day-rate or project-based, remote across the EU
- Languages: English, German
- Contact: hi@borisniehaus.de
- Book a call: https://calendly.com/bo-niehaus/30min

## Key Pages

- [Hire / Portfolio Page](https://borisniehaus.de/hire/): Services, tech stack, selected projects, and booking
- [Main Portfolio](https://borisniehaus.de/): Full project showcase with apps and other work
- [LinkedIn](https://www.linkedin.com/in/bo-niehaus/): Professional profile
- [GitHub](https://github.com/just1984): Code repositories
- [Medium Articles](https://medium.com/@bo.niehaus): Technical blog posts

## Selected Projects

- [Police Data Analysis](https://polizeistressi.de/data/index.html): Interactive dashboard analyzing German police assembly data - patterns, trends, and statistics across thousands of registered public gatherings
- [Die Zentrale](https://borisniehaus.de/geschichte/): Interactive database of all "Die drei ???" episodes - 1,977 characters, a Rocky Beach city map, statistics, and visualizations
- [24/7 AI Assistant on Raspberry Pi](https://medium.com/@bo.niehaus/my-ai-assistant-runs-24-7-on-a-low-cost-raspberry-pi-heres-how-claude-code-telegram-92ed8119d534): Self-hosted Claude-powered assistant accessible via Telegram
- [Beep Beep](https://borisniehaus.de/beepbeepbeep/): Free Morse Code trainer for iOS - 20 levels, authentic tones, fully offline
- [Polizei Stressi App](https://polizeistressi.de/): iOS & Android app ingesting Berlin assembly-authority data into a calendar of demonstrations, rallies, and vigils (2,300+ active users)
- [I See Dead People](https://iseedeadpeople.online/): Film archive tracking recently deceased actors and the share of each movie's cast & crew who have passed away - built on Wikidata and TMDB data in PostgreSQL
- [Vegan Offers Telegram Bot](https://t.me/vegan10317_bot): Telegram bot scanning German supermarket flyers and sending personalized vegan deals twice a week, filtered by postal code

## Published Apps (Apple App Store & Google Play)

- [Aber hier leben](https://borisniehaus.de/aber/): Location-based awareness app showing the local vote share of far-right parties in Germany - federal, state, municipal, and EU elections back to 1994, fully on-device with no backend (Google Play; App Store soon)
- Polizei Stressi: Berlin demonstration calendar app (2,300+ active users)
- Privilegien: Interactive privilege awareness exercise
- Die Farbe Rot: Real-time rocket alert visualization for Israel
- Schulbaer: Berlin schools guide for families (1,400 schools)
- Beep Beep: Free Morse code trainer for iOS