🔧 I Made an LLM Add Features to Its Own Code — Classic Spring Boot vs Clean Architecture

In Part 0, both implementations worked. In Part 1, the LLM modified its own code — and the results challenged my assumptions about both architectures.







Phase 1: feature addition


In Part 0, I had Claude Code generate two complete SaaS billing systems from scratch — one in classic Spring Boot, one in Clean Architecture with Arrow-kt....