B2B SaaS application development

SaaS project types

• Vertical B2B SaaS: industry-dedicated platforms (legal tech, real estate tech, restaurant tech) with domain-specific features.
• Tools for product/marketing teams: dashboard analytics, A/B testing platforms, customer feedback tools, marketing automation.
• Multi-tenant SaaS with white-label: architecture allowing per-client branding, custom domains, theming.
• Internal tools as SaaS: apps replacing manual processes (custom CRM, ticketing, document management) — sold as product.
• API-as-a-Service: backend services consumed by other apps (data enrichment, ML inference, integrations).
• Marketplace platforms: two-sided platforms with transactional flow, commissions, dispute resolution.

SaaS architecture — multi-tenancy done right

The most important architectural decision in SaaS is the multi-tenancy model. Wrong choice = rewrite at first enterprise client requesting isolation. We work with three models:

• Shared database, shared schema (row-level tenancy): most efficient for scale, complex for data isolation. For under 1000 tenants with similar needs.
• Shared database, separate schemas: good compromise. For SaaS with moderate regulatory needs.
• Database-per-tenant: maximum isolation, higher operational cost. For enterprise clients with strict data residency.

B2B SaaS stack

• Frontend: Next.js with TypeScript for SEO + landing pages, plus SPA app shell for dashboard. Tailwind + shadcn/ui design system.
• Backend: Modular NestJS for API, or Laravel for projects with multiple integrations. tRPC for end-to-end type safety.
• Database: PostgreSQL with Prisma or Drizzle ORM. Redis for cache + sessions.
• Auth: Clerk or Auth0 for B2C SaaS, custom JWT with refresh tokens for B2B with SSO. SAML/OIDC for enterprise clients.
• Billing: Stripe Billing for subscriptions, metered usage, dunning. Paddle for automatic EU sales tax handling.