back_office_ops · education · workflow
Duolingo builds an internal fleet of coding agents using Temporal, Claude Code SDK, and Codex CLI
Duolingo engineers were spending time on repetitive coding tasks—removing deprecated feature flags, launching experiments, and modifying Terraform—rather than focusing on product thinking and core logic.
How it works
Common implementation structure
How this type of workflow is generally built, generalized across documented cases — not tied to any one vendor's stack. Click any stage to read what happens there. Specific products that implement these stages appear in “Tools commonly seen” below.
Stage 1 · Fill out workflow JSON form
Duos fill out a simple JSON form providing a prompt, a code repo, and zero or more parameters to define the workflow.
Tools used
CursorCodexClaudeCodex CLIClaude Code SDKCodingAgentTemporalSlack
Outcome
Duolingo deployed a growing fleet of coding agents for routine engineering purposes; Duos can now create a simple agentic workflow in under five minutes, and average custom workflow creation takes 1-2 days.
Results
Time savedunder five minutes
Grounding & classification
Source type: technical build writeup
29 fields verified against source quotes, 1 dropped as unverifiable.
agentic workflowai agentcode generationcode diff prhuman review describedmetric backednamed customerproduction runtime claimedtools describedworkflow describededucationsoftwarecycle time reductionemployee productivitytechnical build writeupback office opsagentic task executionautonomous resolution