A production-grade modular-monolith .NET 10 SaaS foundation for advanced .NET teams, solo founders, and agencies who want a real base.

AppointMe is a modular monolith (.NET 10 + React 19) with the hard parts already solved: multi-tenancy, authentication, authorization, CQRS, domain events, durable messaging, and a typed frontend wired to the backend contract. Clone it, press F5, and you have a running multi-tenant app — then build your product on top.

Live demo

Try the live demo — seeded multi-tenant instance, no signup required.

It's a shared public demo seeded with sample data — other visitors' activity may be visible, and the environment may be reset periodically.

What's inside

• Modular monolith — Identity, Organizations, CRM, and Booking, each a bounded context with its own DbContext and schema, organized by vertical slice.
• Auth done properly — OIDC with a hybrid scheme: JWT Bearer for the API, cookies for browser flows. Keycloak for local development, Entra External ID for the Azure deployment — swappable behind the app's own provisioning flow. Sign-up, email verification, and password reset included.
• Multi-tenancy — company resolution via header/claim with EF Core query filters on a command path, raw Dapper reads carry the tenant predicate by convention.
• CQRS + DDD — writes through EF Core aggregates and domain events; reads through Dapper. Async messaging via Wolverine with a durable SQL transport.
• Permission system — auto-discovered, role-based permissions with default grant policies and conflic resolutions strategies.
• Typed frontend — React 19 + Vite 7 + Tailwind 4, TanStack Query hooks and TypeScript types generated directly from the backend OpenAPI spec (orval).
• One-command local stack — .NET Aspire orchestrates SQL Server, Keycloak, Mailpit, the API, and the frontend, with database migrations applied and demo data seeded automatically. Prefer to skip Aspire? A matching compose.yaml runs the same backing services so you can launch the API and frontend yourself.

Quick start

Goal: clone the repo and have AppointMe running locally — backend, frontend, database, auth, and mail.

You choose how the backing services (SQL Server, Keycloak, Mailpit) run:

• Option A — .NET Aspire (recommended): one command starts everything, including the API and frontend. Zero manual wiring.
• Option B — Docker Compose: brings up only the backing services on the same ports; you run the API and frontend yourself. Pick this if you'd rather not depend on the Aspire host, or want the dependencies running independently of your debugger.

Both produce an identical running app — same images, ports, credentials, and seeded data. Do the prerequisites once, then follow either option.

Prerequisites

First run pulls container images and restores NuGet/Yarn packages, so it takes a few minutes. Subsequent runs are fast — the SQL Server, Keycloak, and Mailpit containers are persistent and reused across restarts.

Clone and trust the dev cert

Both options start here:

git clone <your-fork-or-clone-url> appointme
cd appointme

# One-time: trust the local HTTPS dev cert (used by the API, frontend, and Keycloak)
dotnet dev-certs https --trust

Option A — .NET Aspire

# Start the whole stack — backing services, API, and frontend
cd src/AppointMe.Aspire
dotnet run

Prefer your IDE? Open AppointMe.sln in Visual Studio or Rider, set AppointMe.Aspire as the startup project, and press F5. That's the entire setup.

Either way, the .NET Aspire dashboard opens automatically. Wait for every resource to turn Running (green) — the API waits for SQL Server and Keycloak to be healthy before it starts.

What happens on startup, with no action from you:

• SQL Server, Keycloak, and Mailpit containers come up.
• The appointme Keycloak realm (clients, roles, mappers) is imported.
• EF Core migrations are applied to every module's schema.
• Demo customers and appointments are seeded (Development only).
• The API starts, then the Vite frontend.

Option B — Docker Compose

Compose runs only the backing services (SQL Server, Keycloak, Mailpit) — on the same ports, images, and credentials as Aspire. You run the API and frontend yourself.

# 1. One-time: export the trusted dev cert that Keycloak serves on https://localhost:8082
./docker/keycloak/export-dev-cert.sh
#    (Windows / no bash — run the command the script wraps:)
#    dotnet dev-certs https --format PEM --no-password -ep docker/keycloak/certs/keycloak.crt

# 2. Start the backing services and wait for them to report healthy
docker compose up -d
docker compose ps          # SQL Server and Keycloak should show "healthy"

# 3. Run the API (applies migrations + seeds demo data on first start)
dotnet run --project src/AppointMe.Api

# 4. In a second terminal, run the frontend
cd src/AppointMe.Frontend
yarn install
yarn dev

Then open https://localhost:5173. To stop the services, docker compose stop (keeps data) or docker compose down (removes the containers; SQL Server and Keycloak data survive in named volumes — add -v to wipe them too).

What Compose does for you:

• SQL Server, Keycloak, and Mailpit containers come up with health checks.
• Keycloak serves HTTPS on 8082 using your trusted dev cert and imports the appointme realm.
• SQL Server and Keycloak data persist in named volumes across restarts.

EF Core migrations and demo-data seeding happen when you start the API in step 3 (same as Aspire — the API does this on startup, not Compose).

Where everything lives

About these credentials. Every secret used in local development — the SQL sa password, the Keycloak admin account, and the Keycloak client secrets in appsettings.Development.json and appointme-realm.json — is a throwaway default. It only protects containers running on your machine, and it's committed on purpose so the stack runs with zero setup. These are safe to keep in a public repo, but never reuse them in a real deployment. Production secrets live in Azure Key Vault and are injected at deploy time — see infra/. A gitleaks workflow scans every push/PR to catch any real secret that slips in.

Create your first account

The app manages its own sign-up — you don't register through Keycloak directly.

1. Open https://localhost:5173 and go to Sign up (/auth/signup).
2. Submit the form. AppointMe provisions your user in Keycloak and sends a verification email.
3. Open Mailpit at http://localhost:8026, find the verification email, and click the link. (No real mail is sent — Mailpit catches everything locally.)
4. Log in with your new credentials.
5. Complete onboarding to create your company. You now have a fully working, multi-tenant AppointMe instance with demo data to explore.

That's it — you're up and running.

Project layout

src/
├── AppointMe.Aspire/        # .NET Aspire orchestrator — the F5 entry point for local dev
├── AppointMe.Api/           # ASP.NET Core API host (endpoints auto-discovered)
├── AppointMe.Shared/        # Shared domain abstractions, value objects, infrastructure
├── Identity/                # Authentication & user provisioning (Keycloak, Entra)
├── Organizations/           # Companies, employees, invitations, onboarding
├── CRM/                     # Customer management
├── Booking/                 # Appointments & scheduling
└── AppointMe.Frontend/      # React + Vite + TypeScript SPA

The codebase follows Domain-Driven Design with vertical slice architecture — each use case owns its command, handler, endpoint, and request/response in a single folder. For the full architecture guide, conventions, and patterns, see CLAUDE.md.

Common commands

# Full stack (recommended) — from src/AppointMe.Aspire
dotnet run

# Backing services only, without Aspire (see Quick start → Option B)
docker compose up -d        # start SQL Server, Keycloak, Mailpit
docker compose ps           # check health
docker compose down         # stop and remove containers (data volumes persist)

# Backend only
dotnet build AppointMe.sln
dotnet run --project src/AppointMe.Api

# Tests
dotnet test                                          # everything
dotnet test --filter "FullyQualifiedName~TestName"   # a single test

# Frontend — from src/AppointMe.Frontend
yarn install
yarn dev            # dev server on https://localhost:5173
yarn build          # production build
yarn lint           # ESLint
yarn generate:api   # regenerate the typed API client from the backend OpenAPI spec

When you change the backend contract (endpoints, request/response shapes, routes, or auth attributes), restart the API and run yarn generate:api to keep the frontend's typed client in sync.

Tech stack

• Backend: .NET 10, C# 14, EF Core 10, Wolverine 5.9, Dapper
• Frontend: React 19, TypeScript 5.8, Vite 7, Tailwind CSS 4, TanStack Query
• Infrastructure: SQL Server 2022/2025, Keycloak, orchestrated with .NET Aspire

License

AppointMe is released under the MIT License — free to use, modify, and distribute, including commercially.

It builds on open-source libraries that remain under their own licenses. See THIRD-PARTY-NOTICES.md for attribution and a note on Hangfire (LGPL-3.0).