Tolga EGE

SaaS Application Development

Scalable cloud applications with multi-tenant architecture, subscription billing and user management

Building a SaaS application requires different architectural decisions than classic software. Multi-tenant architecture that isolates each customer's data, a subscription system where users can easily subscribe and cancel, and user dashboards customizable per customer — designing all these correctly from the start prevents future technical debt.

With 21+ years of experience, I develop the SaaS application layer end-to-end: from backend API to frontend dashboard UI, from payment integration to role-based access control.

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Multi-Tenant Architecture Design

The decision between row-level isolation (single DB, scalable) or schema-per-tenant (full isolation) is made based on customer count and regulatory requirements. With PostgreSQL row-level security, each tenant sees only their own data.

Subscription & Billing System

Stripe or Iyzico integration with trial management, plan upgrade/downgrade, seat-based or usage-based billing. Webhook-based payment events process invoices instantly; failed payments trigger automatic retry and customer notification.

User Management and Role-Based Access

Each tenant can invite their own users and assign roles (admin, editor, viewer). Permission matrix is centrally maintained; adding a new feature extends authorization from a single point.

SaaS Dashboard Development

Tenant-specific brand colors, logo and custom domain support. Usage statistics, billing history and team management panel — when customers are self-service, support costs decrease.

Use Cases

B2B SaaS Platform

Separate workspace per customer, tenant-based customization.

Subscription-Based Tool

Content, education or SaaS tool platform.

White-Label SaaS

Resellable, customizable structure for different brands.

Enterprise Internal Tool

Customized SaaS application for internal teams.

Marketplace + Subscription

Two-sided marketplace with subscription hybrid model.

Technology Stack

How We Work

  1. Tenant Architecture Design — Shared schema vs. separate schema decision, data isolation strategy and scaling plan are determined.
  2. Auth & Role System — JWT/OAuth2-based authentication, role-permission matrix and multi-tenant session management are set up.
  3. Subscription Integration — Plan management, trial process, upgrade/downgrade flows and webhook-based invoice processing are integrated.
  4. Dashboard Development — Tenant-specific settings, user invitations, analytics panel and white-label customization interface are developed.
  5. Testing & Performance — Load tests, tenant isolation tests and billing scenarios are validated.
  6. Launch & Monitoring — CI/CD pipeline setup, uptime monitoring and tenant-level error tracking are activated.

Pricing Approach

Basic SaaS app (auth + subscription + dashboard): 150,000–280,000 TL. Multi-tenant B2B platform: 280,000–500,000+ TL. Price varies by tenant count, plan complexity and integration scope.

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Frequently Asked Questions

SaaS development is a broad term covering infrastructure, DevOps and business model consulting. SaaS application development focuses on the application layer: multi-tenant architecture, user interfaces, subscription system and role-based access control.

Isolating each customer's data is critical for both security and scaling. A poorly designed multi-tenant system needs to be rewritten as it grows — causing significant cost and time loss.

For the Turkish market, Iyzico or Stripe (Turkey-supported); for global markets, Stripe is recommended. Paddle or LemonSqueezy is advantageous for small SaaS products as they also handle tax management.

The core structure (auth, tenant, subscription, dashboard) takes 8–12 weeks. With advanced features (analytics, API, white-label) it can extend to 16–24 weeks.

Yes. I build white-label infrastructure including tenant-based logo, color scheme, domain mapping and custom email sending. This structure allows you to sell your product under multiple brands.

Yes, a minimum 1-month bug-fix guarantee after launch is standard. A monthly retainer package is also available for ongoing maintenance.

Read the Pillar Guide

For an in-depth article on this topic with cost breakdowns, real examples and 2026 trends, see our pillar guide.

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