Backend Engineering Glossary

• libuv: Multi-platform C library providing asynchronous I/O and the event loop engine in Node.js.
• Backpressure: The resistance or flow-control signal created when data is produced faster than it can be consumed.
• Cache Stampede: When multiple clients concurrently miss a cache and overwhelm the primary database.
• Idempotency Key: A unique token ensuring that an operation can be retried multiple times without unintended duplicate side effects.