Moving Mountains: Migrating Legacy Code in Weeks instead of Years

▤ Summary

This talk explains how ServiceTitan uses AI agents to accelerate large legacy-code migrations from years down to weeks. It centers on a reporting-metrics migration and shows how the team broke the work into small tasks, standardized context, and used strong validation to let bots complete the bulk of the work. The process relied on CLI tools, staging data, a clear goal-state file, and a self-healing loop that reruns failed tasks until they pass. The main takeaway is that migration projects become far more feasible when teams build an assembly-line workflow for agents instead of assigning the whole problem to humans or a single model.

▦ Linked Companies