Building a software factory with Claude Code: 9 PRs in 4m34s, all tests green
Prompt Engineering · youtube · 2026-10-09
The Prompt Engineering channel demos a "software factory" built on Claude Code running in Upstash Box sandboxes, pointed at a real repo with 10 GitHub issues: finished in 4m34s, opened 9 PRs (skipping one vague issue), all passing hidden tests.
Key points
- Core loop: issue → agent → independent check → human merge
- Why parallel coding agents break, and five fixes: per-agent sandboxes, claim labels, separate verifier + reviewer, live docs, human merges
- Upstash Box sandboxes: fast boot, snapshots, isolation, pause/resume, egress allowlists
- Four-stage pipeline (triage, worker, verifier, reviewer) with typed handoffs; Context7 live docs grounding with API keys injected outside the box
- 7 of 9 verified PRs still conflicted — resolved by an extra integrator stage
- Cost: $3.67 run + $6.37 integrator + $0.01 Box compute
Code is open-sourced at PromtEngineer/software-factory.
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