Stop Making LLMs Deterministic: A Spec-Driven Software Factory

on YouTube ↗23m

" summary

Allegro pilots a spec-driven factory that treats the spec as source of truth and generates code via a multi-agent pipeline (planning, Geneva coding agent, test-out, guardians) running on GCP with Anthropic models through Vertex and spec repo on GitHub. A structured graph-shaped spec (markdown nodes with assertions, tenets, explicit dependencies) cuts token use, surfaces 513 decisions in product catalog (305 product, 208 technical) and enables a run that costs ~$500, takes 12 hours and produces ~80% generated code while flagging the missing 20% for human fixes. Bootstraps, workspace briefs, compile-tests, and a graph validator reduce variance and reveal decision gaps.

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" chapters (21)

1. 0:00Introduction
2. 2:01The agentic software factory at Allegro
3. 3:03Maturity levels and the spec-driven goal
4. 4:38Pilot scope and technology stack
5. 5:59Core specifications
6. 6:40The multi-agent pipeline
7. 9:16The specification as the source of truth
8. 10:01Improving the coding agent
9. 11:03Specification as a graph
10. 11:22Extracting a graph from prose
11. 12:02Comparing specification strategies
12. 12:49The structured Markdown graph
13. 13:45Testing dependency impact
14. 14:56A production specification example
15. 15:26Assertions, tenets, and dependencies
16. 16:42Generated briefs, files, tests, and validation
17. 18:38The spec-driven workflow
18. 19:03Reviews that expose missing decisions
19. 20:16Pilot results: cost and delivery time
20. 21:28Next steps
21. 22:06Key takeaways

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