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Spotify: Months → days for codebase-wide migrations, run by one engineer

Spotify (audio streaming, ~7,000+ employees) reported this on 3 Jun 2026 in company self-report (source). It belongs to the agents, traceability and evals layer.

What they built

Fleet Management (Fleetshift) plus Honk, a background coding agent that performs migrations across thousands of components, with orchestration, tracking and merge handled by the platform.

The result

Migrations that took hundreds of teams weeks or months now take one engineer a few days; the most recent Java migration across backend services took three days.

The number covers maintenance and migration changes across Spotify's codebase.

“What used to be hundreds of teams doing migrations for their components, taking weeks and weeks or months, now can be done by a single engineer in a few days,” Spotify said.

Guardrails

Auto-merge is limited to a defined class of maintenance changes run through the fleet platform; teams see which PRs need attention.

The layer: agents, traceability and evals

Each agent has one narrow task, a named owner and an action log.

  • Agents with one narrow job and an identity
  • A trace of every tool call and decision
  • Eval sets that gate every change

Read the guide to agents, traceability and evals.

Playbooks that use this case

More cases on agents, traceability and evals

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  • 2–3 minutes

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We map how your company runs, pick the first processes with your leadership team, and put them on agents.