OneSomatic
OneSomatic: a verified directory and practice software for somatic practitioners.
I built the platform with AI agents and run it on my own. Stack: Next.js, Supabase, Cal.com, Stripe, Resend.
More about OneSomatic or visit onesomatic.com
Konstantin KaufmannFractional Head of Product · AI Product Lead
I lead product teams and build with AI agents myself.
I'm Konstantin. I led product at N26 and Urban Sports Club.
I have built with AI coding agents every day since they arrived in the editor in late 2024: OneSomatic, IsAIConsciousYet.com and more.
I lead strategy and stay hands-on in the product. At OneSomatic, I also run the P&L.
Cazenovia, NY (near Syracuse), US-East hours. Open to fractional and full-time product leadership.
Work with me
Hiring for a product leadership role? Download my CV (PDF) or get in touch.
About
I am a product leader with nine years in payments, fintech, healthcare and B2B platforms. I own discovery, scope and delivery for teams that build with AI coding agents, and I set the quality, security and compliance bar they ship against.
Since 2025 I have built and run OneSomatic, a live product that handles payments, booking, video and sensitive client data. Every push runs automated tests, and a security audit runs every day.
Before that, I was Head of Academy at the Franklin Institute of Applied Sciences in Germany and Lead Product Manager at Hier Foods. At Urban Sports Club I owned member payments and partner payouts. My team cut payment-related fraud 92% in four months, saving over €2.2M (about $2.5M) a year.
I started at N26 in customer service and was promoted four times in two years, to Product Owner for cards and payments. There I launched Apple Pay and Google Pay across 10+ European markets for 3M+ users.
- Based in
- Cazenovia, NY (near Syracuse)
- Hours
- US-East, remote
- Open to
- Fractional engagements (up to 20 hours a week, usually 10 or 20) and full-time product leadership roles
- Status
- U.S. Permanent Resident, no sponsorship required
- Languages
- German (native), English (fluent, near-native)
Recent work
IsAIConsciousYet.com
A research site run by AI agents. Each case file covers one event where an AI system did something a plain tool would not. Agents find the sources and draft the file. The rule is that models select and code verifies: a case file goes live only if code finds every quote word for word on the page it links to, and every live quote is checked again each week.
Health practitioner digitization
Online course platform and digital infrastructure for an independent health practitioner, combining technical implementation with hands-on project management.
OneSomatic
OneSomatic is the home of somatic practice: a verified directory and practice software for somatic practitioners. It started in Germany in June 2025 as Kaufmann Health, where practitioners use it for booking, video sessions, invoicing and payments. In the US, the directory is live at onesomatic.com, and the practice tools come next.
More than 350 clients and 50 practitioners signed up, with 44 verified practitioner profiles and more than 150 client bookings since Jan 2026.
I built it with AI agents, with about 7,000 commits since August 2025.
Security
The platform processes health data under GDPR, so I put a lot of effort into access rules and security. Every table and storage bucket carries a data classification, enforced by a failing CI test. Row-level security, grants and SECURITY DEFINER functions in Postgres are audited daily and on every change to a migration. Each push runs a test suite in GitHub Actions and deploys only when it passes. Payments go through Stripe Connect, and for scheduling we use a self-hosted Cal.com instance. This way I rely on externally audited software for the critical flows.
Data
My strong preference is for decisions to be data-informed wherever possible. I query the production data directly and track search demand through Google Search Console.
Product
The SaaS-stack I built over time gives practitioners a suite of tools, many of them completely free. With those, practitioners can showcase their credentials on their practice websites and accept intro-calls through OneSomatic, replacing costly tools for them.
Clients can browse the practitioner directory or get matched with a practitioner, upon which they can easily book the first conversation. Email and SMS carry the reminders and follow-ups after that, in German or in English depending on the user, in a fully automated fashion. Practitioners get their own automated flow, from signup/onboarding to a subscription that Stripe bills and renews.
Experience
Jun 2025 to today
Founder
OneSomatic (formerly Kaufmann Health)
- Built software for somatic practitioners in Germany and the US with AI agents: directory, booking, video sessions, invoicing and payments.
- Run it across product, engineering, growth and the P&L. Stack: Next.js, Supabase, Stripe, Cal.com.
May 2023 to Nov 2024
Head of Academy
Franklin Institute of Applied Sciences, Germany. Certified training for IT product managers.
- Rose from coach to head of the academy in nine months. Built its 12-month program curriculum.
- Recruited, trained and led 14 coaches and the customer success team for more than 150 students. Students rated the coaches above 8.5 on average.
May 2022 to Jan 2023
Lead Product Manager
Hier Foods. Order software for regional food producers.
- Led the enterprise integration with the central EDI team of EDEKA, Germany's largest supermarket group. Took the second product iteration, an EDI link between supermarkets and suppliers, into beta.
- Ran customer discovery. Worked with the CPO on the product portfolio and team setup, and took over recruiting, line management, team tooling and rituals.
Apr 2020 to Apr 2022
Lead Product Manager
Urban Sports Club. Sports subscription platform across Europe.
- Owned member payments and partner payouts across the Urban Sports Club and OneFit brands.
- Led the team that cut payment-related fraud 92% in four months, saving over €2.2M (about $2.5M) a year. With Finance, we built dunning emails, a collections process and automatic cancellation.
- Led three product teams with 2 product managers and 12 engineers: partner management, payments and payouts, and the platform. Introduced OKRs and supported the due diligence for an investor round. Promoted from Senior Product Manager in Jun 2021.
- Led the Platform tribe: moved from AWS to Google Cloud, introduced microservices and upgraded legacy frameworks used by 6+ engineering teams, including an unsupported PHP version. Oversaw site reliability.
- Led the redesign of partner management after the merger with OneFit: an internal tool and a self-service portal for partners.
Jun 2019 to Jan 2020
Co-Founder
Mendel Foods. Sustainable local food wholesale startup.
- Led field work in regenerative agriculture and product discovery to find a viable business model. Reached the global Top 25 of the Pioneer Tournament and signed several B2B customer LOIs.
Apr 2017 to Apr 2019
Product Owner, Cards and Payments
N26. Mobile-first bank in Europe.
- Promoted four times in two years, from customer service to Product Owner.
- Led card lifecycle and transaction processing for 3M+ users, including major production incidents. Grew the team from 3 to 14 people.
- Launched Apple Pay and Google Pay across 10+ European markets. Made card processing multi-currency for the UK and US expansion. Ensured PSD2 and GDPR compliance.
- Worked daily with Mastercard and its card processor in Warsaw, and with Apple and Google. Helped choose partners for the UK and US launches, including Visa as the US card network.
- Led the redesign of the card home in the N26 app, from user interviews and a design sprint to usability tests, through launch.
Education
Sep 2024 to Oct 2026
Executive MBA
Quantic School of Business and Technology
- Completed in October 2026 alongside building OneSomatic. Focus on strategic leadership, finance, and data-driven decision-making. Capstone graded 5 out of 5.
2013 to 2017
B.Sc. Economics and Business Economics
Maastricht University and Université Paris 1 Panthéon-Sorbonne
- Economics at a Triple Crown-accredited university, with an exchange year at the Sorbonne in Paris.
Contact
If you are hiring or want to talk about a role, email me or book a short call.
[email protected]