5 Engineering Mistakes I Made at My First Startup

Hindsight is 20/20

At my first startup, we moved fast. We shipped. We also made some technical choices that cost us later. Here are the five I'd fix if I could go back.

Mistake 1: No Observability From Day One

We added logging and metrics "when we had time." We never had time. When things broke in production, we were blind. We spent days chasing bugs that proper tracing would have solved in hours.

Mistake 2: Treating the Monolith as Temporary

"We'll split into services later." We didn't. The monolith grew. By the time we wanted to split, boundaries were fuzzy and dependencies were everywhere.

Mistake 3: Skipping Tests "Because We're a Startup"

We had almost no tests. Refactors were terrifying. We shipped bugs that would have been caught by a simple test suite.

Mistake 4: No Database Migrations Strategy

We changed the schema by hand. Sometimes we forgot a column. Sometimes production and staging drifted. It was a mess.

Mistake 5: Optimizing Too Early

We spent weeks building a "scalable" queue system before we had meaningful load. We should have used a managed service or even a cron job.

The Takeaway

Startups need to ship. But a few disciplined choices — observability, boundaries, tests, migrations, and deferred optimization — save you from rewriting everything later.