I built Kumi – a typed, array-oriented dataflow compiler in Ruby
Hi HN, I'm the author of Kumi, a project I've been working on and would love to get your feedback on. The Original Problem: The original idea for Kumi came from a complex IAM problem I faced at a previous job. Provisioning a single employee meant applying dozens of interdependent rules (based on role, location, etc.) for every target system. The problem was deeper: even the data abstractions were rule-based. For instance, 'roles' for one system might just be a specific interpretation of Active Directory groups. This logic was also highly volatile; writing the rules down became a discovery…
I built Kumi – a typed, array-oriented dataflow compiler in Ruby launched on October 23, 2025 with 5 votes and more than 75% of that year's launches.
What it does
In the maker’s words, at launch
Hi HN, I'm the author of Kumi, a project I've been working on and would love to get your feedback on. The Original Problem: The original idea for Kumi came from a complex IAM problem I faced at a previous job. Provisioning a single employee meant applying dozens of interdependent rules (based on role, location, etc.)…
Does a similar job
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Source: Show HN post ↗ · launch text quoted in part
Launched alongside, October 2025
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