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@masitecno

Fernando Castellanos

@masitecno·Joined June 2026

Practical notes from a backend developer debugging real-world systems.

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Fernando Castellanos's blogs

Backend Debugging Notesbackend-debugging.hashnode.dev3 posts

Articles Comments

From Smoke Tests to Production Truth: Lessons from Load Testing Five APIs with Locust

Load testing five backend APIs with Locust: clean scaling, saturation, empty-payload traps, and why zero failures can still be a performance failure.

17 min read·backend-debugging.hashnode.dev

The Bug Wasn't in Our Code

A production debugging story about temporal coincidence, evidence, and why the most recent change is the easiest suspect to convict by mistake.

8 min read·backend-debugging.hashnode.dev

How I Use AI Assistants for Debugging Without Trusting Them Blindly

A practical workflow for backend developers who want speed without losing judgment.

10 min read·backend-debugging.hashnode.dev

About

Nothing here yet.

Available for

Nothing here yet.

Fernando Castellanos's blogs

Backend Debugging Notesbackend-debugging.hashnode.dev3 posts