B2B SaaS Application Development
From validation-stage MVPs to multi-tenant systems that hold up under enterprise procurement: SSO, audit logs, and the data-isolation guarantees that first big contract will ask for. The architecture is decided early, so you do not rewrite the product at the first large deal.
Written reply within one business day, no obligation.
Still validating the idea? Start with an MVP for startups. This page covers the SaaS product that has to hold up after validation. Budgets: SaaS MVP cost in 2026.
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 a 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. Choose wrong and you rewrite when the first enterprise client asks for isolation. There are three models:
- Shared database, shared schema (row-level tenancy): most efficient for scale, complex for data isolation. For under 1,000 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.
Typical SaaS pricing
- SaaS MVP (market validation): €5,000 – €15,000, 8–10 weeks (MVP Startup package, fixed price)
- SaaS web app with 5+ flows, roles and subscriptions: €10,000 – €30,000, 3–5 months
- Mid-tier B2B SaaS (post product-market fit): €30,000 – €80,000, 4-8 months
- Enterprise SaaS (multi-tenant, compliance): €80,000 – €250,000+, 8-14 months
- Migration from legacy stack to modern: €20,000 – €100,000, 4-10 months
How we work
- Scope and estimateDescribe the project. We reply within one business day, and within 48 hours you get a written answer with budget and timeline estimates. Free.
- Proposal and contractFixed price or hourly rate, clear deliverables and acceptance criteria. You own the code. Full IP transfer at the end, no hidden licences.
- 2-week sprintsDemo at the end of every sprint, code in your repository, CI/CD from sprint 1.
- Launch and supportProduction deploy and monitoring. Bug fixing for 30 days on an MVP and 60 days on a web app; for websites, optional monthly care (P5). The same technical contact throughout.
Relevant live projects
FAQ
How much does a SaaS MVP cost?
A validation MVP costs €5,000–€15,000 (MVP Startup package) and takes 8–10 weeks. A web app with 5+ flows and subscriptions costs €10,000–€30,000, and a B2B SaaS after product-market fit runs €30,000–€80,000 over 4–8 months.
Which multi-tenancy model should we pick?
It depends on your target clients: a shared schema for many similar accounts, separate schemas for moderate regulatory needs, a database per tenant for enterprise clients with strict data residency. The decision is made during discovery.
Can we start with an MVP and grow it after validation?
Yes, as long as the tenancy model and billing are chosen correctly from the start. That is why expected scale over 3–5 years is discussed during discovery.
Who owns the code?
You do. The code lives in your repository from the first sprint, with full IP transfer at the end and no hidden licences.
Read on
Have a project in this space?
Tell us what the product has to do. You get a written answer on feasibility, budget and timeline.