Hi HN — I built fin123 after repeatedly seeing trading desks rewrite spreadsheet logic inside application code. Typical workflow today: Analyst builds Excel m

Hi HN — I built fin123 after repeatedly seeing trading desks rewrite spreadsheet logic inside application code. Typical workflow today: Analyst builds Excel model Developer rewrites formulas in Python / JS Application table That rewrite step is painful and error-prone and endless. fin123 takes a different approach: the worksheet itself is the artifact: Worksheet spec... Compiled worksheet (deterministic artifact)... Application embeds the viewer Design goals: - deterministic builds - offline computation - finance-safe joins and lookups - Polars-backed table evaluation - explicit lifecycle: commit, build, verify, release The core engine is open source (Apache-2.0) and runs fully locally. Happy to answer questions.