About Recent Work OneSomatic Vita Work with me

I lead product teams and build with AI agents myself.

I'm Konstantin — product leader 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, Product Radar, isaiconsciousyet.com and more. I lead strategy, own the P&L, and stay hands-on in the product. Syracuse, NY (US-East). Open to fractional and full-time product leadership.

Work with me

Hiring for a product leadership role? Get in touch.

About

I lead products and the teams that build them, and I'm hands-on enough to ship the product myself. Strategy, execution, and operations, end to end.

At N26, I owned payments infrastructure for 3M+ users—incident response, PSD2 compliance, Apple Pay and Google Pay launches across Europe. Promoted four times in two years. At Urban Sports Club, I led payments, platform engineering, and site reliability: fraud detection (92% reduction, €2.2M saved), cloud migrations, legacy system upgrades, and the kind of debugging where money goes missing and someone has to find it.

Since 2025 I have built OneSomatic, software for somatic therapists in Germany and the US, and I run it across product, engineering, growth and P&L.

My work spans payments, healthcare, and marketplace platforms — domains where getting it wrong has real consequences.

I'm based in Syracuse, New York, and work US-East hours. I'm open to fractional engagements (~20 h/wk) and to full-time product leadership roles.

Konstantin G. M. Kaufmann
N26 LogoMendel Foods LogoUrban Sports Group LogoHier Foods LogoFranklin IAS Logo

Recent Work

Kaufmann Health Logo

OneSomatic (formerly Kaufmann Health)

Software for somatic therapists. Therapists run booking, video sessions, invoicing and payments in one place, and clients find them in a verified directory. I built the platform with AI agents and run it on my own. Live in Germany as Kaufmann Health. The US directory is at onesomatic.com.

Stack: Next.js, Supabase, Cal.com, Stripe, Resend.

Is AI Conscious Yet?

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.

isaiconsciousyet.com

Kampschulte Logo

Health Practitioner Digitization

Online course platform and digital infrastructure for an independent health practitioner, combining technical implementation with hands-on project management.

OneSomatic

OneSomatic, called Kaufmann Health in Germany, is a live platform for somatic therapists and their clients. I built it with AI agents, with about 7,000 commits since August 2025.

The platform processes health data under GDPR, so I put a lot of effort into access rules and security. That includes row-level security in Postgres with a script that re-checks those rules every day and after every 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 we rely on externally audited software for critical flows of the app.

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.

The SaaS-stack I built over time gives therapists a suite of tools, many of them completely free. With those, therapists can showcase their credentials on their practice websites and accept intro-calls through Kaufmann Health, replacing costly tools for them.

Patients can browse the therapist registry or get matched with a therapist, 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. Therapists get their own automated flow, from signup/onboarding to a subscription that Stripe bills and renews.

The biggest product decision so far was killing my own revenue model. I had launched on commission, taking a cut of each session. The numbers did not work for a bootstrapped platform, and therapists with established practices did not want the model, so I moved the business onto subscriptions for therapists and rebuilt billing around them.

Shipping working products is faster than ever, so the bar for quality and safety has risen. Knowing what to build, orchestrating agents well, deciding what to automate and iterating fast with users are now the hard problems. That is the work I bring to companies that want to move faster with AI without lowering that bar.

Work

Kaufmann Health Logo

Founder

OneSomatic (formerly Kaufmann Health) · Jun 2025 - Present

  • Built software for somatic therapists 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.
Franklin Institute of Applied Sciences Logo

Head of Academy

Franklin Institute · May 2023 - Nov 2024

  • Built and led a 12-month Product Management certification program from curriculum design to operations.
  • Recruited and managed 14 coaches and a Customer Success team, serving 150+ students across 10+ courses.
Hier Foods Logo

Lead Product Manager

Hier Foods · May 2022 - Feb 2023

  • Built and launched an EDI integration (ISO standard) for supermarket-to-supplier order communication—B2B infrastructure with legacy system constraints.
  • Drove technical integration with enterprise partners while managing product roadmap, recruiting, and engineering team operations.
Urban Sports Group Logo

Lead Product Manager — Payments, Platform & Site Reliability

Urban Sports Club · Apr 2020 - Apr 2022

  • Owned payments, partner payouts, finance, and compliance across two brands. Reduced payment-related fraud by over 92%, saving €2.2M annually.
  • Led the Platform tribe: migrated core infrastructure from AWS to Google Cloud, introduced microservices, and upgraded legacy frameworks (including a PHP version no longer receiving security updates) used by 6+ engineering teams.
  • Oversaw Site Reliability Engineering. When money was missing or transactions didn't reconcile, my team investigated and resolved it.
Mendel Foods Logo

Co-Founder

Mendel Foods · Jun 2019 - Feb 2020

  • Built an ordering platform for restaurants sourcing from small-scale local suppliers. Global Top 25 in the Pioneer Tournament (Marc Andreessen, Patrick Collison, Stephen Wolfram).
N26 Logo

Product Owner — Cards & Payments

N26 · Apr 2017 - Apr 2019

  • Promoted four times in two years—from Customer Service to Product Owner leading three payments teams and managing card infrastructure for 3M+ users.
  • Launched Apple Pay and Google Pay across 10+ European markets. Enabled UK and US expansion by making card processing multi-currency. Ensured PSD2 and GDPR compliance.
  • Managed major production incidents with direct customer impact. Grew team from 3 to 14. Worked directly with Google, Mastercard, and card processing partners.

Education

Executive MBA

Quantic School of Business and Technology · Sep 2024 - Oct 2026

  • Completed in October 2026 alongside building OneSomatic. Focus on strategic leadership, finance, and data-driven decision-making. Capstone graded 5 out of 5.

B.Sc. Economics and Business Economics

Maastricht University & Université Paris 1 Panthéon-Sorbonne · 2013 - 2017

  • Economics at a Triple Crown-accredited university, with an exchange year at the Sorbonne in Paris.

Contact

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