Josef Büttgen

Independent product studio — rapid 0→1 design, build and launch of SaaS products

Founded a personal product studio and independently designed, built and shipped six live products

spanning AI, lead-generation, B2B and B2C SaaS (see Selected Projects). Demonstrates exceptional shipping velocity and full-stack breadth — research, UX, frontend, backend, payments, deployment and go-to-market across very different problem domains.

Software engineer and bootstrapped founder who designs, builds and ships full-stack, AI-native SaaS end to end — from the first line of code to paying international customers. Built Setter AI, an AI appointment-setting platform that has handled 110,000+ lead conversations and 1.4M+ messages across ~127,000 contacts and booked ~6,400 sales appointments for clients in 15+ countries — grown profitably with zero outside funding. Founder of the product studio Helicon Solutions (six shipped products). Selected as 1 of 10 international founders for the OpenAI- and Cognition-sponsored HRG Hacker Residency (2025) and a three-time Apple WWDC Scholar. TUM computer-science graduate (thesis 1.3). Equally strong shipping product solo and inside large agile engineering teams. Bootstrapped B2B SaaS — AI appointment-setting for international sales teams

Designed and built the entire product end to end — an AI chatbot that follows up and qualifies leads over WhatsApp & SMS and books sales appointments automatically, powered by OpenAI GPT and Anthropic Claude. Scaled to 110,899 lead conversations, ~1.42M messages and ~6,400 booked appointments across 3,115 onboarded organizations in 15+ countries (US/Canada, UK, DE, FR, AU and more). Reached a peak of 35,764 conversations / 145,038 messages in a single month (May 2026); grown

profitably and self-funded via organic SEO/YouTube distribution (~70,000 lifetime visits). Earlier AI-voice product (2024) placed 53,056 calls totalling ~288 hours of talk time before the pivot to messaging. Featured on StarterStory (Sept 2025) as a bootstrapped AI founder case study. Owns the full stack: TypeScript/React/Node, Supabase/PostgreSQL, Twilio & WhatsApp Business API, Stripe, Calendly/Acuity/Google Calendar integrations, CI/CD.

• · now under Helicon Booking & payment platform for in-person classes

Designed and built a full-stack booking-and-payments SaaS with custom booking forms, fully integrated with Stripe Connect.

Processed $80,000+ GMV and 600+ submissions per year for course providers.