Codify SaaS Blog - Page 3
Code-first guides and deep dives on building B2B SaaS products, designing APIs, scaling web apps, and modernizing legacy software.
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.
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.
Database Migration Strategy for SaaS — Zero-Downtime Migrations in Production
The migration was one line. It locked a production table for 45 minutes in the middle of the workday while we watched the error rate climb. Here is how to run database migrations on SaaS without taking the site down.
SaaS Feature Flags — Building a Simple Feature Toggle System Without Third-Party Services
You do not need LaunchDarkly to ship feature flags. Here is how to build your own toggle system in a day — NestJS backend, Redis caching, Next.js frontend, admin UI, and zero monthly bills.
How to Structure a SaaS Monorepo With NestJS Backend and Next.js Frontend
We spent six months jumping between repos on our first SaaS project. Here is the monorepo structure we use now — Turborepo, shared types, Zod validation, and a CI pipeline that only rebuilds what changed.
SaaS Webhook System — How to Build Outgoing Webhooks for Your Platform
We built our first webhook system in a weekend. It worked — until a client's endpoint went down and we kept hammering it, queueing failed deliveries in memory until the process ran out and restarted. Here is the production-grade outgoing webhook system we use now.
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.