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Inside the Evolution of Chisel- Jack Koenig on Open Source Silicon Design at SiFive

calendar_today December 3, 2025 person domain chips-alliance

From reluctant programmer to compiler maintainer, a decade-long journey shaping open source digital design tools.

Jack Koenig is a Senior Staff Engineer at SiFive and one of the longest-standing maintainers of the Chisel and FIRRTL projects.

Over the past decade, his contributions have helped shape the foundation of open source hardware description in Scala, bridging the worlds of compiler theory, HDL design, and functional programming.

In this developer spotlight, we explore Jack’s journey into open source silicon, his technical contributions, and what lies ahead for Chisel and its ecosystem.

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