background-jobslisted

# Background Jobs Skill ## Domain Context **What is this skill?** This skill provides background job patterns for web applications: job queue architecture, long-running sync operations, progress tracking and reporting, failure handling and retry, job prioritization, and concurrency management. Load when implementing async processing, building job queues, designing progress indicators for long operations, or handling failure recovery for background work. > If it takes longer than 10 seconds, it does not belong in a request handler. Move it to a background job with progress tracking. ## Coverage This skill covers job queue architecture (push-based vs pull-based, priority queues), long-running operation patterns (sync jobs, data migrations, bulk operations), progress tracking and reporting (percentage, stage-based, ETA estimation), failure handling and retry strategies (exponential backoff, dead letter queues, partial failure recovery), job prioritization and concurrency control, the decision framework for inline vs background execution, and user-facing progress communication patterns. ## Philosophy Background jobs are the mechanism that separates a responsive user interface from reliable data processing. The web request lifecycle imposes hard time limits (Vercel: 60-300s, Lambda: 15min), but real-world operations — syncing 50,000 orders, generating monthly reports, reconciling financial data — can take minutes or hours. Agents frequently make two mistakes: putting long op