About Slicekit
A SaaS foundation you would have built anyway
Every new SaaS starts with weeks of the same plumbing: authentication, a typed client, background jobs, logging, dashboards, CI. Slicekit is that plumbing, assembled, wired together and tested, so the first thing you write is your product.
Why it exists
Most starter kits are either a thin scaffold that leaves the hard parts to you, or a sprawling boilerplate you spend longer deleting than using. Slicekit aims for the middle: a complete, honest slice of a real application that demonstrates how the pieces fit, while staying small enough to read in an afternoon.
It is built around vertical slices and domain-driven design on the API, and a mirrored slice-per-feature layout on the frontend. That symmetry is the point: a feature is a single slice through the whole system, from the database to the button, so adding or removing one is a local change rather than a scavenger hunt.
Slicekit is built and maintained by Gerwin Kuijntjes, a certified software engineer. It's built with AI in the loop but never on autopilot: every slice is architected, reviewed and owned by a human, with architecture and integration tests as guardrails. AI-accelerated craftsmanship you can trust and extend, not unreviewed AI slop.
One architecture, both sides
The API and the SPA follow the same vertical-slice shape. Learn one feature and you can navigate every feature, on either side of the wire.
Batteries included, not bolted on
Auth, audit, messaging, storage and observability are first-class parts of the template, not afterthoughts you wire up under deadline pressure.
Readable over clever
Explicit handlers, named events and obvious folders. The code is written to be read by the next engineer, or the next agent, six months from now.
Yours to own
Buy once and the code is yours under a commercial license: standard tooling, no proprietary runtime. Rename it, rip parts out, deploy anywhere. There is no platform to depend on.
What's in the box
A modern, mainstream stack with no exotic dependencies, chosen so the knowledge transfers to your other projects, and so hiring against it is easy.
- API
- .NET 10 · Minimal API · Wolverine CQRS · EF Core · PostgreSQL
- Frontend
- Vite · React 19 · TypeScript · TanStack Router & Query · shadcn/ui · Tailwind v4
- Messaging & storage
- RabbitMQ · Redis · MinIO (S3) · transactional outbox
- Observability
- OpenTelemetry · Loki · Tempo · Prometheus · Grafana · Alertmanager
- Tooling
- Docker Compose · GitHub Actions · Testcontainers · architecture tests
What you're buying
Slicekit is a one-time purchase, not a subscription. You pay once, get the full source under a commercial license, and own it. There is no hosted service to lock you in and no per-seat tax on the product you build on top. Clone the private repo, delete what you do not need, and keep the parts that save you weeks. Lifetime updates are included.
Own the foundation, ship the product
Slicekit hands you the essential 80% of a SaaS (event-driven architecture, enterprise auth, a finished admin panel, observability and CI) wired together and tested. Buy it once and spend your time on the 20% that is your product.