SaaS Foundations — A Guide for Technical Founders

1. What Is SaaS? A Definition for Technical Founders

SaaS is not just software delivered over the internet — it’s a complete architecture built around recurring revenue, multi-tenant infrastructure, usage-based metering, continuous delivery, and customer lifecycle management. This article defines what SaaS means when you’re the one building it, not the one selling it.

  1. SaaS definition
  2. Recurring revenue architecture
  3. Multi-tenant infrastructure
  4. Usage-based metering
  5. Continuous delivery
  6. Customer lifecycle management
  7. B2B SaaS differences
  8. The SaaS ecosystem
  9. Pricing models
  10. Career implications for technical founders

2. Recurring Revenue: A Guide for SaaS Founders

Recurring revenue is what separates a side project from a real business. This guide covers what recurring revenue actually is, how to measure it beyond the basic MRR metric, why it matters for fundraising and unit economics, and the subscription management infrastructure you need to scale.

  1. Subscription plans
  2. Usage-based charges
  3. Seat-based billing
  4. Hybrid models
  5. Revenue recognition
  6. Churn
  7. Expansion revenue
  8. Billing infrastructure needed to manage predictable income

3. Monthly Recurring Revenue (MRR): What It Means for SaaS

MRR is the single most important metric for SaaS businesses. This article explains how to calculate MRR using the five-component model (new, expansion, contraction, churned, net), why your Stripe dashboard is probably misleading you, and how to grow it predictably.

  1. MRR calculation
  2. The five components of MRR
  3. MRR vs ARR vs revenue
  4. Pricing models affect MRR
  5. Common mistakes technical founders make
  6. Tracking MRR with billing infrastructure
  7. A practical checklist for growing MRR

How These Articles Connect

The What Is SaaS article defines the core SaaS business model. Recurring Revenue explains the income mechanism that makes SaaS different from traditional software. MRR is the specific metric that measures recurring revenue and drives every business decision.

Together, they form the foundation for understanding pricing models (covered in the SaaS Pricing and Tiered Pricing silos) and the infrastructure needed to build a scalable SaaS product (covered in the Multi-Tenant Architecture).