nrml
Backend developmentHeyGen

VM Fleets: Account for Every Machine

Unify three cloud providers, persist fleet membership across CLI processes, and retain machines whose cleanup fails.

The scenario

Unify three cloud providers, persist fleet membership across CLI processes, and retain machines whose cleanup fails.

A failure to reason about

Use a small backend development scenario to compare current behavior with the requirement.

Illustrative context for the topic. The exercise’s full requirements arrive in the workspace.

Questions to bring to your review

  • Which caller makes the reported behavior visible?
  • What focused regression would distinguish the current behavior from the requirement?
  • What existing behavior must remain intact after the change?

Skills you will practice

  • REST and gRPC
  • Asynchronous operations
  • Resource ownership
  • Persistent state
  • Compensating cleanup

Read the existing code, reproduce the reported behavior, review proposed changes, and verify your final implementation. You can use AI assistance while staying responsible for the result.

Prepare with a worked example

See how nrml evaluates an attempt, including the limits of automated evidence.