Banda, Hwang, and Kodwani write about Flux, DoorDash's in-house platform for delegating engineering tasks to cloud-based agentic workloads. Built to overcome the resource, security, and observability limitations of laptop-based agent execution, Flux automated 130,000 engineering tasks in a single month in 2026. The platform is organized around four composable primitives—sandboxes, an MCP gateway, playbooks, and invocation surfaces—that let teams define, run, and audit agent workflows without prescribing how each engineer structures their work.
- Sandboxes run on Firecracker microVMs with a 95th percentile end-to-end setup time under five seconds
- The Agent Gateway grants scoped, per-task permissions to internal systems (CI, observability, code search, deployment tools) and logs every action
- Playbooks are single YAML files that mix agentic steps with deterministic ones, letting teams shift logic between modes as requirements evolve
- Moving agent output from private Slack channels into public threads was the key adoption unlock
- Sandboxes run on Firecracker microVMs with a 95th percentile end-to-end setup time under five seconds
- The Agent Gateway grants scoped, per-task permissions to internal systems (CI, observability, code search, deployment tools) and logs every action
- Playbooks are single YAML files that mix agentic steps with deterministic ones, letting teams shift logic between modes as requirements evolve
- Moving agent output from private Slack channels into public threads was the key adoption unlock
Leela Kumili writes about DoorDash's Flux platform, which moved LLM-based coding agent workloads from developer laptops to cloud infrastructure, automating 130,000 engineering tasks in a single month and supporting over 25,000 automated code reviews per week. The platform was built after local execution hit limits on power, uptime, and security, and is organized around four primitives: Firecracker microVM sandboxes, an in-house MCP gateway, YAML-defined playbooks, and multiple invocation surfaces (Slack, GitHub, cron, CLI, conversational interfaces).
- Sandboxes achieve a 95th percentile SLO under 5 seconds for full setup, including microVM start, repo clone, build tool install, and agent harness configuration.
- Playbooks can mix agent-driven steps with deterministic code where predictable execution or validation is required.
- The Agent Gateway enforces scoped permissions and logs all agent activity for auditing and policy enforcement.
- DoorDash switched Slack integration from private channels to public threads so engineers could observe agent executions and see how other teams delegated work.
- Sandboxes achieve a 95th percentile SLO under 5 seconds for full setup, including microVM start, repo clone, build tool install, and agent harness configuration.
- Playbooks can mix agent-driven steps with deterministic code where predictable execution or validation is required.
- The Agent Gateway enforces scoped permissions and logs all agent activity for auditing and policy enforcement.
- DoorDash switched Slack integration from private channels to public threads so engineers could observe agent executions and see how other teams delegated work.
Flux is a set of continuous and progressive delivery solutions for Kubernetes that are open and extensible. The latest version brings many new features, making it more flexible and versatile.
