Building a Multi-Tenant SaaS with ASP.NET Core: A Practical Guide
Tenancy models, tenant resolution, data isolation with EF Core and the other foundations every .NET SaaS product needs.
Read the articleSaaS Development
SaaS Development from Architecture to Production
We build scalable multi-tenant SaaS products — the tenant model, billing, permissions and infrastructure that every SaaS needs, plus the features that make yours different.
- Multi-tenancy
- ASP.NET Core
- Next.js
- Flutter
- Stripe
- PostgreSQL
- Azure
- AWS
The SaaS foundations we build
Every SaaS product needs the same hard, unglamorous parts. We build them properly so your team can focus on the product.
Multi-tenant architecture
Tenant isolation, per-tenant configuration and a data model designed for growth.
Authentication & roles
Sign-up, SSO options, organizations, invitations and role-based access control.
Subscription billing
Stripe plans, trials, metered usage, invoices and webhook handling.
Admin & support tools
Internal back-office to manage tenants, plans, users and support tasks.
APIs & integrations
Public APIs, webhooks and connectors to the tools your customers already use.
Observability
Logging, metrics, alerts and audit trails across tenants.
SaaS development, end to end
- Product and technical discovery for a first release
- Architecture and data model design
- Web app in Next.js or React, API in ASP.NET Core or Node.js
- Mobile clients in Flutter
- AI features using LLM APIs where they add real value
- CI/CD, environments and cloud deployment on Azure or AWS
- Ongoing development with a dedicated team after launch
Backend
- ASP.NET Core
- C#
- Node.js
- REST APIs
Frontend & mobile
- Next.js
- React
- TypeScript
- Flutter
Data
- PostgreSQL
- SQL Server
- MongoDB
Platform
- Stripe
- Azure
- AWS
- Docker
- CI/CD
How we deliver SaaS projects
Discovery
Users, core workflows, pricing model and the smallest valuable release.
Architecture
Tenancy model, data design, integrations and infrastructure plan.
Build
Iterative delivery with demos and a staging environment you can use.
Launch & grow
Production release, monitoring and continued development.
Frequently asked questions
Which multi-tenancy model should we use?
It depends on your customers' isolation, compliance and scale needs. Common options are a shared database with a tenant key, a schema per tenant, or a database per tenant. We usually start simple and design so larger customers can be isolated later.
Can you take over an existing SaaS codebase?
Yes. We start with a technical review of the architecture, code quality, deployment and security, then agree priorities with you before continuing development.
Do you handle subscription billing?
Yes. We integrate Stripe for subscriptions, trials, plan changes, invoices and webhooks, and connect billing state to feature access in your application.
Can you build the mobile app for our SaaS?
Yes. We build Flutter apps for iOS and Android that use the same API as your web application.
Related services
.NET Development
ASP.NET Core APIs, SaaS platforms and enterprise applications on modern .NET.
Software Architecture
Architecture reviews, technical direction and fractional architect support.
API & Backend Development
REST APIs, integrations and backend services that other systems depend on.
AI Application Development
New AI-powered products, assistants and agents built on proven LLM APIs.
Flutter Development
Cross-platform iOS and Android apps built with Flutter and Dart.
Cloud Development
Azure and AWS applications, containers and CI/CD pipelines.
Building or scaling a SaaS product?
Tell us what you are building, the stack you use and the capacity you need. We reply within one business day.