John Sandall is a London-based data scientist and entrepreneur with a decade of experience turning data into practical, scalable solutions across marketing, engineering, and public-interest projects. As Co-Founder of Day30 and CEO of Coefficient, he leads data-driven performance marketing for subscription apps and delivers data science, engineering, and training services to a diverse client base. His work spans building scalable data architectures, automating analytics workflows for firms like Kingston Smith and Franchise Partners, and advancing open-data election methodologies through SixFifty. He co-founded Knodium and is a Residential Fellow at Newspeak House, reflecting a sustained interest in how technology, education, and politics intersect. An Imperial College London MSci Mathematics graduate, he combines rigorous quantitative thinking with hands-on software delivery to ship reliable systems at scale.
Contributions:2 PRs, 1 push, 3 branches in 2 years 4 months
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