Codify SaaS Blog - Page 11
Code-first guides and deep dives on building B2B SaaS products, designing APIs, scaling web apps, and modernizing legacy software.
SaaS Background Job Architecture — Why We Moved From Cron Jobs to a Queue System
Your SaaS background jobs are only as reliable as the weakest cron command. Here's how we rebuilt our job infrastructure with BullMQ — retries, dead letter queues, monitoring, and a real email-notification story from production.
How to Design a SaaS Audit Log That Satisfies Enterprise Clients
We nearly lost an enterprise deal because we couldn't answer a simple question: 'who changed what, and when?' Here's the audit log system we built — schema, NestJS interceptor, compliance, and the query UI that turned a sales blocker into a feature.
PostgreSQL Row-Level Security for SaaS — Complete Implementation Guide
PostgreSQL Row-Level Security moves tenant isolation out of application code and into the database, where a forgotten WHERE clause can't undo it. Here's the complete production implementation — policies, NestJS integration, performance, testing, and rollout.
NestJS Project Structure: The Exact Folder Setup We Ship
The default NestJS project structure is fine until about 20 controllers, then it quietly turns into a swamp. Here's the exact 3-layer folder structure we use in production — Core, Shared, and Feature modules — with the rules that keep it clean as the team grows.
How We Structured a Multi-Tenant SaaS Database: 3 Approaches
There are three ways to build a multi-tenant SaaS database, and we picked the wrong one first. Here are all three approaches, the real trade-offs, and how to choose the right one before it costs you a rewrite.