From Delayed Job to Solid Queue: How a 10-Year Rails App Finally Achieved Linear Scaling February 16, 2026 Lessons from Kaigi on Rails 2025 — Shohei Kobayashi In large Rails systems, background jobs are not a detail — they are the system. Email delivery, AI processing, document generation, data cleanup, notifications, analytics pipelines — everything … Continue reading From Delayed Job to Solid Queue: How a 10-Year Rails App Finally Achieved Linear Scaling →