Whenever starting a new SaaS in .NET 8, developers often waste dozens of hours rewiring the exact same baseline plumbing before building core business features.
Here is a breakdown of the production architecture patterns needed to get a scalable boilerplate running.
Whenever starting a new SaaS in .NET 8, developers often waste dozens of hours rewiring the exact same baseline plumbing before building core business features.
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Here is a breakdown of the production architecture patterns needed to get a scalable boilerplate running.
1. Clean Architecture Separation
Keep domain rules isolated from frameworks:
- Core Layer: Pure domain entities (
Tenant,User) and interfaces. No external dependencies. - Infrastructure Layer: Database context (
AppDbContext), token generation, and third-party integrations (Stripe, Dodo Payments, OpenAI). - API Layer: Controllers, Swagger configurations, and dependency injection pipelines.
2. Multi-Tenancy via EF Core Query Filters
Avoid leaking tenant data across requests. Configure automated query filtering inside your DbContext:
csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); // Automatically applies to all queries for entities implementing ITenantEntity modelBuilder.Entity<CustomerRecord>() .HasQueryFilter(e => e.TenantId == _currentTenantService.TenantId); } 3. Webhook Cryptographic Verification Never trust unverified payloads from payment gateways. Always verify request signatures using constant-time HMAC-SHA256 comparison to prevent replay and timing attacks. 4. Command Local Containerization Ship a clean docker-compose.yml that provisions PostgreSQL, applies Entity Framework migrations, and runs your API locally in seconds. I packaged this exact structure into a ready-to-run template called TechLock: [https://techlock.dev] What tenant isolation strategies do you prefer in EF Core? Would love your feedback in the comments! 
