Category: SaaS Architecture

Centralize SaaS sign-in with OpenID Connect, validate tokens at each service boundary, and separate authentication from current authorization decisions.

Diagnose an Apache HTTPS request that reaches the wrong virtual host by checking address and port matching, ServerName, DNS, SNI, and loaded configuration.

Make long-running POST operations safe to retry with a client-generated idempotency key, an atomic operation record, and a status endpoint.

Set PostgreSQL tenant context locally inside the same transaction and pooled connection that runs tenant queries, then always release the client safely.

Enforce tenant-prefixed Redis keys behind one cache wrapper and understand where shared-instance eviction still crosses tenant boundaries.

Choose shared or dedicated SaaS file storage, design tenant-scoped object keys, issue limited upload URLs, and enforce lifecycle and deletion rules.

Implement SaaS feature flags with global defaults, tenant overrides, deterministic evaluation, caching, audit history, and safe cleanup.

Design multi-tenant cache keys, invalidation, authorization boundaries, and per-tenant limits so cached data cannot leak between SaaS customers.

Design tenant-scoped soft deletes with deleted timestamps, filtered queries, uniqueness rules, restoration, retention, and permanent purge jobs.

Compare no-code, low-code, AI-assisted, and custom development for a SaaS application using practical criteria such as data, security, hosting, extensibility, and maintenance.