Portrait of me

Stefan Eißler

Product Engineer | AI Strategist | Business Strategy

Bridging the gap between corporate strategy and technical execution. As a Product Engineer with a background in Business Informatics, I specialize in building high impact web and mobile applications. My expertise in AI automation and data driven systems allows me to create digital products that solve complex business challenges and drive efficiency.
I don't just write code I engineer competitive advantages. Let’s turn your digital roadmap into a high performance reality.

Selected Work

Carcheck

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Car Buying AI Assistant

Find the perfect car: Analyze price, condition, and running costs in seconds!

  • AI-powered vehicle analysis with market comparison and evaluation.
  • Transparent cost breakdown for insurance, taxes, and maintenance.
  • Will support kleinanzeigen.de, mobile.de, autoscout24.de, and more.

Next.js

Gemini AI

n8n

Stripe

Bitcoin Business Hub

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The Financial Service Layer for the Bitcoin Economy

Automated accounting processes and business intelligence for companies using Bitcoin as hard money within their operations.

  • Enterprise middleware for GoBD-compliant transaction workflows and automated document assignment.
  • Seamless bridge between Bitcoin wallets (non-custodial) and established ERP systems such as DATEV or Lexware.
  • Active pilot customer phase and technical Proof-of-Concept (PoC) for scaling Bitcoin adoption in small and medium-sized enterprises.

Next.js

Bitcoin

Bitcoin Lightning

Business Owner

Ensemble Music

ensemblemusic.online

A social app designed to make music collaboration effortless and stress-free.

  • Full-stack application built with React Native for both web and mobile, seamlessly integrated with Supabase for backend support.
  • Real-time chat functionality to connect musicians and a localization algorithm for discovering nearby collaborators.
  • Recently launched and now entering the funding and marketing phase.

Tamagui

React

React Native

Turborepo

Adoray

Festival App

A mobile-first application developed for Adoray Switzerland, offering users access to current events, festival registration, and an enhanced festival experience through an interactive map-based game.

  • Seamless event registration powered by a Supabase backend.
  • Features a cooperative team-based game where participants complete location-based challenges and submit videos and photos directly through the app.
  • Delivers real-time notifications to drive engagement and create a hybrid digital-physical festival experience.

Expo

Supabase

Giftbuddy

Coming Soon
Your personal gift planner

Never forget a great gift idea again! Capture and organize presents with ease.

  • Simple and intuitive management of gift ideas for your contacts.
  • Create and maintain wishlists so you're always prepared for special occasions.
  • Receive smart reminders for events where a thoughtful present would be appreciated.

Expo

Tamagui

WatermelonDB

Supabase

Blog