Duolingo's cloud operations team built a self-service workflow platform using Temporal Nexus to eliminate infrastructure request bottlenecks. Previously, engineers submitted Slack/Jira requests for high-risk operations like RDS resizing or DynamoDB deletions, requiring manual copy-paste and elevated IAM roles. The solution uses a gateway namespace with Nexus endpoints to expose restricted cloud-ops workflows to all engineers without granting direct namespace access. A React JSON Schema Form portal lets engineers trigger workflows with validated inputs, while an approval step (via Temporal signals) keeps cloud-ops in control. The architecture evolved into a broader 'workflow-as-a-service' ecosystem: shared Nexus operations for Slack notifications, an AI assistant for natural-language workflow selection, a CLI tool, Claude Code skills for deployment, and a bootstrap workflow that reduces Temporal onboarding from hours to under 5 minutes. Temporal adoption at Duolingo grew organically from a single team tool to an organization-wide platform with 50+ workflows.