A workshop for software ventures —
crafted, not assembled.
A white-label, multi-tenant member directory platform for clubs, dojos, gyms, and studios. Branded iOS app per tenant, web admin console, Stripe billing, two-factor authentication, and audit logging. Native Kotlin Android port in development.
Wellness and training intelligence for iOS. Native Swift, on-device computation, integrates with HealthKit. Subscription via in-app purchase. Native Kotlin Android port on the roadmap.
Tatzel Labs is the operating entity behind a small, deliberate set of software products — shipped natively on the platforms they live on, and built by people who use them.
We work in Swift on iOS, Kotlin on Android, and Go on the server. We choose native over cross-platform because the difference shows. We choose small, focused products over sprawling platforms because they are easier to make well.
The company is a single-member Massachusetts limited liability company, formed in May 2026. Our products span consumer mobile (LiftCortex) and business-to-business SaaS (MemberDex), with a bias toward platform-native experience and respectful data handling.
We are not currently hiring. For collaboration, integration, or product inquiries, see contact below.
Software engineer with thirty years of work across embedded systems, mobile, and SaaS; five patents in home automation; and a habit of shipping personal apps on weekends. Tatzel Labs LLC is the operating entity for that work as it shifts from hobby to craft.
For longer-form writing, project deep dives, and the personal portfolio, see the bio site — it lives separately from the company.
For partnership, integration, or product inquiries.
david@tatzel-labs.comLegal & agent correspondence: see Registered Office above.