SaaS Platform Development from MVP to Scale-Up

Is the SaaS model right for your product?

The SaaS model is a good fit when independent customers use the same system, but each sees only their own data, settings and users. The platform can sell subscriptions, activate different plans and serve customers without manual installation for each one.

• You have a validated idea, pilot customers and need a first production version.
• You are turning an internal tool into a product for external companies.
• You have a working SaaS product with weak access controls, manual billing or difficult deployments.
• You are developing a vertical SaaS product for a specific sector, such as elevator companies, accounting firms or field teams.

A good example is LiftexPro, ERP for elevator companies, where inspection scheduling, buildings, mobile technicians and automated billing are brought together in a SaaS ERP system.

What do you get with a SaaS platform?

Multi-tenant architecture and data protection

We design the boundaries between customers before developing the core features. Depending on the risk and operating model, we choose a separate schema for each tenant or row-level security in PostgreSQL, tenant context for requests and separate keys for sensitive data. Tests verify that a user from one customer cannot read or modify another customer's data.

Subscriptions, plans and payments

We build monthly or annual billing, trial periods, plan changes, proration, failed payments and retries. When needed, we integrate Stripe Billing for subscriptions, webhook events and invoices. Idempotent webhook processing prevents duplicate activation or duplicate charges.

Users, roles and sign-in

We add roles and permissions at the module or resource level, team invitations, MFA and an audit log for sensitive actions. For B2B customers, we can connect SSO via SAML or OIDC with Google Workspace, Microsoft Entra or Okta. We can add SCIM provisioning when needed.

API, webhooks and integrations

A REST or GraphQL API with OpenAPI documentation, versioning, rate limiting, API keys and OAuth enables your customers to connect their own systems. Webhooks with a retry mechanism send events to CRM, ERP, Slack, Intercom and other services. To connect external software, you can also explore API integrations.

Administration, reporting and monitoring

The admin panel can display tenants, users, plans, usage and payment issues. We add data export, activity reports and impersonation with an audit trail. For the technical team, we prepare structured logs, metrics, tracing, error tracking and alerts when problems occur.

Which option is right for you?

The price within the range depends on the number of roles and modules, the data isolation approach, the payment flow, integrations, migration, and security and availability requirements. After discovery, we define the scope, stages, and specific proposal. Infrastructure and external services are calculated separately when needed.

How does the development process work?

1. 01
   Discovery and scope

   We hold working sessions with the people who know the product, sales, and operations. We define user roles, core processes, tenant boundaries, initial plans, and acceptance criteria. By the end, you have an MVP scope, an architectural direction, stages, and a proposal.

2. 02
   Architecture and foundation

   We prepare the repository, environments, database, users, tenant context, permissions, and CI/CD. We decide which services are needed in the first version and which can wait. The code is uploaded to a repository under your control.

3. 03
   Development and testing

   We develop the interface and backend in short cycles with regular demos. We test access between tenants, payments, webhooks, critical business rules, and error recovery. If you have pilot customers, we incorporate their feedback before launch.

4. 04
   Pilot and production launch

   We launch with a limited number of real customers and monitor logs, errors, usage, and failed payments. We refine the onboarding process and remove features that add complexity without delivering value. After testing, we expand access.

5. 05
   Enhancement and handover

   We add new plans, integrations, SSO, or capacity based on actual usage. We provide documentation, runbooks, and architectural decisions so your team can maintain the system or continue with another provider.

How long does it take to build an SaaS MVP?

A focused MVP is typically planned over several months once the scope is defined and the required input materials are ready. The timeline is shorter with one core workflow, few roles, and a ready-made payment solution. It becomes longer with complex onboarding, data migration, a mobile app, many external integrations, or specific security requirements.

What do you need to prepare?

• A description of the first customer problem and the process the platform needs to solve.
• A list of pilot customers or people who can test the product.
• Rules for pricing, plans, the trial period, and tax treatment.
• Examples of documents, roles, imports, or integrations that are mandatory.
• Someone on your side who makes product decisions and approves the results.

What technical approach do we use?

We choose the technologies based on the product and the team that will take it over. Options include Next.js and React for the interface, .NET, Node.js, or Python for the backend, PostgreSQL as the primary database, Redis for caching and queues, and S3-compatible object storage. Hosting can be on AWS, Hetzner, or Vercel. CI/CD, preview environments, and automated checks are configured according to risk, not by default.

Who owns the code and infrastructure?

The code is uploaded to a repository you control and belongs to you under the agreement. We do not require critical parts to remain in our own cloud or in a proprietary Saitami system. We document the architectural decisions and prepare instructions for deployment, backup, and core operations.

What happens after launch?

We can continue with maintenance and enhancements after go-live. When needed, we agree on incident response times, regular product reviews, monitoring, and a gradual handover to your team. The goal is for you to control the product, not depend on a specific provider.

Do you have an idea or an existing system to discuss?

Send us a description of the idea, current system, or internal tool you want to turn into SaaS. During the meeting, we define the first workflow, user types, payments, integrations, and constraints. To speak with the team, use the contact form.