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Jeremiah Say

Lead Systems Architect @GreenCalculus. Building 1,000+ GHG Protocol calculators in Vanilla JS — IPCC AR6, IEA 2026, DEFRA 2025. Zero dependencies. greencalculus.com

Location Singapore Joined Joined on  Personal website https://greencalculus.com

Education

Singapore Institute of Technology

Work

Lead Systems Architect at GreenCalculus

CSRD/ESRS E1 disclosure requirements, translated into data fields — a developer's map

CSRD/ESRS E1 disclosure requirements, translated into data fields — a developer's map

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7 min read
Building a SHA-256 audit trail for emission factor provenance in WordPress

Building a SHA-256 audit trail for emission factor provenance in WordPress

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6 min read
How to build a grid emission factor lookup in Vanilla JS using IEA 2026 regional data

How to build a grid emission factor lookup in Vanilla JS using IEA 2026 regional data

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5 min read
Building a zero-dependency carbon calculator platform — architecture decisions and why I rejected every framework

Building a zero-dependency carbon calculator platform — architecture decisions and why I rejected every framework

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4 min read
Why most carbon calculators are using the wrong methane GWP value (and how to fix it)

Why most carbon calculators are using the wrong methane GWP value (and how to fix it)

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2 min read
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