SaaS Platform Development — MVP to Scale-Up
End-to-end product engineering, from validating the idea to a multi-tenant architecture that serves thousands of tenants. MVP in 8-12 weeks. We own billing, SSO, RBAC, API and observability — so you sell subscriptions instead of debugging infrastructure on weekends.
What the build covers
Multi-tenant architecture
Schema-per-tenant or row-level security in PostgreSQL, request-scoped tenant context, dedicated KMS keys for enterprise. One customer never sees another's data — not on a bug, not on an injection attempt.
Subscriptions and billing engine
Stripe Billing for recurring subs with trials, proration, dunning, tax (VAT OSS) and invoice PDFs. Stripe Connect with split payments for marketplaces. Idempotent webhooks so you never double-charge.
User management — RBAC, SSO, audit log
Resource-level roles and permissions, SAML and OIDC SSO (Google Workspace, Microsoft Entra, Okta), SCIM provisioning, MFA. Full audit log — table stakes for SOC 2 and enterprise sales.
API and developer experience
REST or GraphQL with an OpenAPI spec, versioning, per-tenant rate limits, retrying webhooks, API keys and OAuth 2.0. Docs with curl, JS and Python samples so integrators ship without a support ticket.
Admin and analytics dashboards
Tenant admin for customer success: impersonation with audit trail, usage metrics, churn signals, MRR/ARR. For end customers — usage dashboards with export and embedded analytics.
Observability
Structured logs in Loki or Datadog, Prometheus/Grafana metrics, distributed tracing via OpenTelemetry, Sentry error tracking, uptime monitoring. On-call sees the problem before the customer reports it.
Who SaaS platform development is for
Founders with a PMF idea
You have a validated idea, early design partners and need an MVP between €15,000 and €40,000 — ready to show investors or sell. We own product calls too, including what stays OUT of the MVP.
Scale-ups on legacy stacks
Your SaaS works, but the legacy stack drags: PHP monolith, no tenant isolation, manual billing, downtime on deploy. We rewrite critical paths incrementally and bring observability in first.
Corporates productising internal tools
You built an internal system and external companies want the same thing. We turn it into multi-tenant SaaS — tenant boundaries, billing, self-service onboarding — without breaking current usage.
How we build it
Stack: Next.js and React on the frontend; .NET, Node.js or Python on the backend; PostgreSQL with Redis for cache and queues; S3-compatible storage. Hosting on AWS, Hetzner or Vercel. CI/CD via GitHub Actions with preview deploys per PR. Monitoring on Grafana, Prometheus and Loki — open source, no observability lock-in.
Four steps. Discovery (2 weeks) — workshops, jobs-to-be-done mapping, locked MVP scope, signed pricing contract. MVP (8-12 weeks) — parallel frontend and backend tracks, weekly demos with real pilot users. Launch and iterate. Scale-up — multi-region, SOC 2 readiness, enterprise SSO, sales-led tier.
Code is yours from day one. We document ADRs so a future CTO understands the why. See API integrations, custom software development and mobile apps for the SaaS.
Why Saitami for your SaaS product
MVP in production
Average time from signed contract to the first paying customer. B2B SaaS with deeper onboarding lands closer to 12 weeks.
Production incidents
P0/P1 incidents in the first 6 months across 12+ SaaS platforms shipped. Feature flags, canary releases and sub-minute rollback do the work.
Starting investment
Fixed price for MVP scope, milestone-based, in euros. No hidden subscription, no per-seat fees. Code and infra yours outright.
A platform often ships alongside a vertical product — for example a reservations and scheduling system as services-vertical SaaS, or software for construction companies as industry-specific SaaS. Same architecture, different domain.
Frequently Asked Questions
What is the difference between an MVP and a scale-up SaaS?
An MVP focuses on a single job-to-be-done, one tenant tier and one billing plan — validation and first paying customer in 8-12 weeks. Scale-up adds multi-region, enterprise SSO, SOC 2-grade audit logs, per-tenant compute isolation and sales-led pricing. Engineering focus shifts too — MVP optimises for change velocity, scale-up for reliability and compliance.
Who owns the code after the build?
You do. From the first commit we push to a Git repository you control, typically a GitHub org in your name. No Saitami cloud holds critical pieces of the platform. We document architecture with ADRs and hand over runbooks. Moving the project to an in-house team or another vendor later takes days, not months — no proprietary lock-in.
Can you take on support after launch?
Yes. After go-live we offer an SLA-backed support contract with defined response times for P0/P1/P2 incidents, weekly product reviews and a shared roadmap with your team. On-call rotation via PagerDuty and a public status page for your customers. As your team grows, we transfer knowledge gradually — the goal is your independence, not lock-in.
How much does SaaS platform development cost?
Pricing starts at €15,000 for a focused MVP with one tenant tier, Stripe billing and a core feature set. A typical B2B SaaS with RBAC, SSO, API and admin tooling lands between €25,000 and €60,000. Multi-tenant scale-up of a legacy stack is usually €40,000-€120,000. Everything in euros, fixed-price, milestone-based.
Ready to ship your SaaS?
Book a discovery workshop — 90 minutes with a product lead and senior engineer to scope your SaaS platform development. We walk through the idea, sketch the architecture on the whiteboard, and leave you with a concrete MVP scope, timeline and fixed euro price.
Book a discovery workshop →