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Happy Teams Build Better Products
6 lessons every engineer eventually learns the hard way.
 • Raul Junco
Performance Doesn’t Start at SELECT; It Starts at CREATE.
Stop blaming your queries. Most database slowness comes from design mistakes made on day one.
 • Raul Junco
CDC Isn’t the Shortcut You Think It Is
7 hidden costs of “free” event publishing
 • Raul Junco
What Uber’s Slackbot Taught Me About Building Smart AI Assistants
Forget dashboards. The fastest path to insight is an agent that speaks your data’s language.
Most Engineers Want Both Consistency and Scalability.
Reality Doesn't Work That Way.
To Cache or Not to Cache
A 7-question framework for making caching a design decision, not a default.
 • Raul Junco
Every repeated LLM call is money on fire
Redis 8 just changed the game with semantic caching that understands meaning, not just keys.
 • Raul Junco
Retries Have an Evil Twin: Duplicates
Every distributed system has a duplication bug; it just hasn’t been triggered yet.
 • Raul Junco
System Design Classroom
System Design Classroom
A System Design Newsletter to help you build better software.
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