[sewen]

We tried building a scalable and resilient cloud coding agent with @restatedev for workflows, @modal for sandboxes, @vercel for compute, and GPT-5 / Claude as the LLM. Think a mini version of cursor background agents or Lovable, with a focus on scalability, resilience, orchestration.

It is a fun exercise, there are many interesting patterns and micro problems to solve: * Durable steps (no retry spaghetti) * Managing session across workflows (remember conversations) * Interrupting an ongoing coding task to add new context * Robust life cycles for resources (sandboxes) * Scalable serverless deployments * Tracing / replay / metrics

Sharing our learnings here for anyone who builds agents at scale, beyond "hello world"