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A Milvus core maintainer shares hard-won lessons from spending $600 on Claude Code subscriptions to tackle cross-platform compilation of a 2M-line C++ distributed database. The initial attempt failed spectacularly — three months of work, a 1000-file patch, and endless platform regressions. The breakthrough came from three workflow changes: defining explicit constraints before writing any code, reviewing tests rather than implementation, and using git worktree to run 6 parallel Claude Code sessions across multiple machines. The key insight is that vibe coding large infrastructure is compute-bound, not talent-bound, and that tests in a mature codebase serve as the specification. The hardest remaining problems — implicit developer knowledge and team-wide adoption — still require human judgment.

Spent $600 on Claude Code to Vibe-Code a 2M-Line Database

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