Mailbox + gateway
Supervised writes go through a gateway into a DataActor mailbox. HTTP handlers never own the write lifecycle.
- Bounded mailboxes
- Gateway send with timeout
- Unregister during restart → 503
- Contact + document writes supervised
OTP-inspired · crash → restart · keep serving
Crash a write path — the supervisor restarts it while HTTP keeps serving. Auth, OAuth, Stripe, S3, email, and AI chat ship wired on Go, Rust, Node, Python, Ruby, .NET, Elixir, and PHP.
Supervisor + DataActor on mainstream stacks — not a blank CRUD starter · Try a live preview before you buy.
Supervised write paths use a mailbox + gateway. Unregister during restart returns 503 — HTTP keeps serving. OTP-inspired on Go, Rust, Node, Python, Rails, and .NET; native BEAM OTP on Elixir. PHP ships the same production kit without the actor layer. Read the design philosophy
Supervised writes go through a gateway into a DataActor mailbox. HTTP handlers never own the write lifecycle.
OTP-inspired one-for-one restart on Go, Rust, Node, Python, Rails, and .NET; native BEAM OTP on Elixir.
The supervisor story sits on a real SaaS kit — sessions, payments, uploads, email, and AI — same contract across languages.
Running apps — poke the crash endpoint, then buy the zip with the same wiring.
Go · Gin · Vue
Go's most popular HTTP framework — fast JSON APIs and mature middleware
Rust · Axum · Svelte
Modern async Rust — type-safe Axum routes on Tokio
PHP · Laravel · React
PHP's #1 framework — Laravel APIs with a React SPA
Python · Django · React
Python's batteries-included web framework — Django + React
// THE S+S CONTRACT
Every stack ships the same production foundation — auth, payments, uploads, privacy, Docker, architecture docs, and your library. You only choose the language and framework.
Sign in GitHub or Google
Pick stack Language + SPA
Pay once Stripe checkout
Ship Library + updates
// PRODUCTION KIT
Auth, OAuth, Stripe, S3, email, and AI chat — already wired. Your stack choice changes the language and framework, not whether the boring integrations exist.
Real apps shipping on Keller stacks — same auth, Stripe, and Docker wiring.
Live
findoctors.in
Healthcare directory
Live
medicko.com
Medical platform
Live
punesi.com
Live product
Live
ferrumlabs.io
Labs & tooling
Go, Rust, Node, Python, Ruby, .NET, Elixir, and PHP — OAuth, Stripe, and Docker already wired. Niche runtimes stay on Specialty (footer), not the homepage pitch.
Go · Rust · Elixir · Node · Python · Ruby · .NET · PHP
Frontend
React Vue SolidJS Svelte Next.js Angular
Design
Plain Ocean Startup Stellar Glass
A rotating sample of mainstream backends — browse the marketplace for the full catalog.
Go Fiber API with PostgreSQL, Keller auth pages, and a frontend you pick at checkout. Full S+S v2+v3 shipped: email/password, AI chat (SSE), pgvector search, Resend, contact, admin, S3 uploads — plus OTP-inspired supervisor + DataActor (let it crash, auto-restart).
Fiber OTP-inspired supervisor PostgreSQL pgvector
FastAPI backend with PostgreSQL, sign-in, and a frontend you pick — React, Vue, SolidJS, Svelte, Next.js, and Angular. Full S+S v2+v3 shipped: email/password, AI chat (SSE), pgvector search, Resend, contact, admin, S3 uploads — plus OTP-inspired supervisor + DataActor (let it crash, auto-restart).
FastAPI OTP-inspired supervisor PostgreSQL pgvector
Full Phoenix app with LiveView pages — no separate frontend repo. Landing, sign-in, chat, search, and contact are ready to customize. Full Keller v2 on native BEAM OTP: email/password + Resend, AI chat (SSE), pgvector search, contact + admin, OAuth, Stripe, S3 uploads — GenServer supervision, let it crash.
Phoenix LiveView PostgreSQL pgvector
Node.js Express API with PostgreSQL, OAuth, Stripe, and your choice of SPA at checkout. Full S+S v2+v3 shipped: email/password, AI chat (SSE), pgvector search, Resend, contact, admin, S3 uploads — plus OTP-inspired supervisor + DataActor (let it crash, auto-restart).
Express OTP-inspired supervisor PostgreSQL pgvector
Pick a scaffold-time skin at checkout — not a runtime theme switcher.
Crash-isolated writes, restart policy, and the production kit already connected. Test live. Buy once.