Web apps, mobile apps, APIs and internal tools: the software that sits around a custom AI system, or stands on its own. We build it, ship it, and keep it running.
Custom work by the team behind our three products, priced after a free one-page plan. A small business usually starts with the AI front desk · all three products
Every engagement is a different shape: sometimes a greenfield MVP, sometimes legacy modernization, sometimes one feature inside a working system, often the software around an AI agent we are also building.
Next.js / React frontends, Node and Python backends, Postgres or SQLite. From MVP to production-grade with auth, payments, and dashboards.
iOS and Android native apps. SwiftUI / UIKit on iOS, Kotlin / Jetpack Compose on Android. App Store + Play Store submission, ongoing maintenance.
Custom API design, third-party integration work, webhook receivers, OAuth dances. The unglamorous plumbing that makes everything else work.
The lower-visibility software that runs your operation: admin panels, reporting dashboards, ops automation, internal CRUD tools.
A 15-minute call, a free one-page plan within 48 hours, then a fixed-price build. Ongoing work after that is quoted per project, monthly, or handed to your team with our documentation.
What you are trying to build, what exists already, what is blocking you. No deck.
A one-page plan in 48 hours, free either way, yours to keep. If you go ahead, the build is fixed price, scoped and timed before any code ships.
Ongoing work quoted per project and monthly, or your team takes the codebase and our documentation and runs it themselves.
Three of the systems we've shipped, with the software work called out.
A 50,000 sq ft wellness destination, client since 2023. We built the WordPress site, the native iOS app (Android on the way), and the booking and Adyen payments integration with their spa PMS, TAC. The iOS app on the App Store.
A Brooklyn yacht charter, client since December 2025. We rebuilt the site from scratch, with booking through their own LatePoint and Square, and added server-side purchase tracking so paid bookings show up in their analytics.
Smaller builds we shipped end to end, both built from scratch, including online ordering and checkout for Paradise Flower Shop.
Most clients run software development alongside two or three other service lines. Here's where the seams are smoothest.
Simple4u is a six-person team: founder in Brooklyn, engineers in Kyiv. Embedded with World Spa since 2023, rebuilding NYC by Yacht’s site and search since December 2025, and our own company on the same kind of systems.
Your message reaches the founder directly.