Lewis Hemens
Building at Stealth
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolLewis Hemens is a seasoned software leader and builder with 14 years' experience spanning founding a YC-backed startup (Dataform, acquired by Google) to senior engineering roles at Google focused on BigQuery and data tooling. He combines hands-on product engineering—evidenced by front-end contributions to projects like ASCIIFlow—with strategic leadership as a former Senior Staff Engineer and Engineering Manager. Based in London, he has deep expertise in data infrastructure, developer tooling and shipping robust UIs across web and Electron environments. Known for turning research-grade ideas into production systems, he blends startup grit with scale-up discipline and enjoys experimenting with new things, literally “cooking something new,” while quietly maintaining practical open-source projects.
14 years of coding experience
14 years of employment as a software developer
Y CombinatorComputer Science Computer Science Natural Sciences, Computer Science Computer Science Natural Sciences at University of Cambridge
Stackoverflow
61reputation
12kreached
1answer
0questions
Github Skills (8)
uid10
javascript10
front-end-development10
ui-design10
react10
mobile-development9
google-bigquery6
regex6
Programming languages (8)
Github contributions (5)
lewish/asciiflow
Jan 2014 - Dec 2021
ASCIIFlow
Role in this project:
Front-end Developer
Front-end DeveloperContributions:35 reviews, 217 commits, 122 PRs in 8 years 1 month
Contributions summary:Lewis primarily focused on developing the front-end components of the Asciiflow application. Their contributions began with the creation of basic starting classes and continued with implementing core UI elements, including toolbars, and the ability to save/export diagrams. The user integrated text input tools and added interactive features, like a mobile-friendly touch interface. The user's work involved a shift in the project's structure, integrating Electron and moving from Closure to pure JavaScript, while ensuring the core diagram features worked as expected.
csharp
dataform-co/dataform-segment
Dec 2019 - Jun 2022
Contributions:1 release, 1 review, 11 commits in 2 years 6 months
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