Authentication turned out to be the most politically charged decision in the entire project. Every team had opinions about OAuth providers, session management strategies, and token lifetimes. We eventually settled on a pragmatic middle ground that nobody loved but everyone could live with.
The Migration Path
Database connection pooling was our biggest blind spot. Under normal load, direct connections worked fine. But during traffic spikes, the database would hit its connection limit and cascade failures across all services. A simple PgBouncer setup eliminated the issue entirely.
Tooling Choices
The most valuable lesson wasn’t technical at all. It was about communication. Every delay, every surprise bug, every scope change traced back to assumptions that hadn’t been validated with stakeholders early enough.
Security Considerations
Our initial benchmark numbers looked promising in staging but fell apart under production traffic patterns. The difference? Staging used uniform request distributions while real users exhibit bursty, correlated behavior that exposes different bottlenecks entirely.
If you’re facing similar challenges, feel free to reach out. We’ve open-sourced several of the tools mentioned in this post and are happy to share more details about the ones we can’t release publicly.
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