See It Flow

See how engineering works.

Every area below is an interactive experience: watch the behavior, change the conditions, and understand the trade-off behind the decision.

Learning

Production Engineering

Pick a failure mode to explore. Each one runs the full arc — trigger, amplification, collapse, and recovery.

What happens when a cache key expires and thousands of requests hit the database simultaneously.

What happens when a slow downstream dependency meets an uncontrolled retry policy.

How a small slowdown in one dependency spreads upstream until it takes down the whole system.

Why a Kafka consumer group falls behind, why adding consumers doesn't always help, and how to fix it.

Why an application runs out of database connections, and why increasing the pool size isn't automatically the fix.

Why two perfectly valid concurrent operations can produce an invalid result, and how synchronization prevents it.