SaaS product development requires a different mindset from a classic website project. A SaaS product serves many customers at once, earns recurring revenue and evolves continuously. This guide covers the technical and product decisions between an idea and your first paying customer: multi-tenant architecture, subscriptions, payments and security.
Stages of SaaS product development
- Problem validation: customer interviews, competitor analysis and testing willingness to pay.
- MVP scope: the smallest feature set that proves your value proposition.
- Architecture: tenancy model, authentication, data model and infrastructure.
- Design: onboarding, empty states and core workflows.
- Build and test: short iterations, automated tests and monitoring.
- Launch and measure: activation, retention and churn.
Scoping the MVP
Ask one question: why would a customer pay for this? Features that directly answer it belong in version one; detailed reporting, advanced roles and long integration lists can wait for real feedback. Some foundations should never be skipped, though: secure authentication, tenant data isolation, backups and a working billing flow.
Design the first five minutes
Many users never return if they fail to see value in their first session. A short sign-up, a starting screen with sample data and a fast path to the first meaningful result often beat adding features. That is why UI/UX design is a revenue lever in SaaS, not an afterthought.
Multi-tenant SaaS architecture options
| Approach | How it works | Best for |
|---|---|---|
| Shared database, shared schema | A tenant_id column on every table; queries filtered by tenant | Many small customers, fast start |
| Shared database, schema per tenant | Separate schema for each tenant | Mid-market, stronger isolation |
| Database per tenant | Each customer has its own database | Enterprise and strict compliance |
Most new products start with a shared schema. PostgreSQL Row Level Security adds a database-level safety net against application bugs leaking data across tenants.
Plan these early
- Tenant routing via subdomain or custom domain
- Users belonging to multiple organisations
- Roles and permissions
- Per-tenant usage limits and feature flags
- Audit logs
Subscription billing design
Billing is more than charging a card monthly. Plan for free trials, monthly and annual plans, upgrades and downgrades, per-seat or usage-based pricing, dunning for failed payments, cancellation and refund rules, and invoicing. Keep plan and entitlement data in your own database rather than relying solely on the payment provider; it makes switching providers far easier.
Payments: Stripe, Iyzico and app stores
- Stripe: excellent tooling for subscriptions, invoices and tax in global SaaS. Note that Stripe has long not supported companies registered in Turkey, so Turkish teams often operate through an entity abroad. Check Stripe's current country list.
- Iyzico: a common choice for Turkey-based companies selling in Turkish lira, with support for local cards and recurring payments.
- App stores: if you sell digital access inside a mobile app, Apple and Google billing rules also apply.
Keep pricing flexible in code
Your first pricing will almost certainly change. Store plan limits and feature access in a configurable entitlements table rather than hard-coding them, so you can add plans or keep existing customers on legacy pricing. If you plan usage-based pricing, record usage events reliably from day one.
An abstraction layer over payments lets you run both a local and a global provider side by side.
Security and operations
- Secure sessions, two-factor authentication and SSO for enterprise customers
- Encryption in transit and at rest, regular backups and restore tests
- Error tracking, performance monitoring and alerts
- Automated tests, a staging environment and reversible deployments
Data protection laws such as GDPR or Turkey's KVKK apply depending on your customers; get legal advice for your situation.
Choosing the stack
The most important criterion is that your team can build quickly and safely with the stack for years. Popular, well-documented tools make hiring and maintenance easier.
Next.js lets you ship the marketing site and the application dashboard from one codebase, supporting both SEO and delivery speed. PostgreSQL is a mature choice for multi-tenant data. Adding AI features such as document analysis or in-app assistants can sharpen your value proposition.
BernSoftware supports SaaS teams end to end, from MVP scope to subscriptions and payment integration. See our web development services or contact us to discuss your product.
Frequently asked questions
How long does it take to build a SaaS MVP?
It depends on scope, but a focused MVP can often launch within a few months. Feature count, integrations and decision speed have the biggest impact.
Can one tenant's data leak to another in a multi-tenant app?
It can in poorly designed systems. Tenant-scoped queries, database row-level security and automated tests greatly reduce that risk.
Should I use Stripe or a local payment provider?
It depends on where your company is registered and where your customers are. Global products often use Stripe; products selling locally in Turkey often use Iyzico. Many teams abstract payments to support both.
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