~/blog

Engineering Blog

Deep dives into how Mercy works under the hood — serverless runtimes, isolation primitives, job queues, and more.

·18 min read

Inside mercio-runtime: How Mercy Executes Serverless Functions

A deep technical dive into mercio-runtime — the Bun-based execution engine that manages warm workerd V8 pools, BullMQ job routing, and R2-cached bundles to run serverless functions on Mercy with sub-millisecond warm latency.

  • serverless
  • workerd
  • v8
  • bullmq
  • architecture