Sebastien Ballesteros
Senior Software Engineer at DuckDuckGo
Rancho Palos Verdes, California, United States
Summary
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Top SchoolSebastien Ballesteros is a Senior Software Engineer with 13 years of experience who combines a PhD in mathematical modeling with hands-on web engineering to deliver well-architected, product-focused solutions. At DuckDuckGo he led an incremental rewrite of the search results page, drove adoption of Next.js and a design system, and shipped web‑vitals and A/B testing work that materially improved engagement and revenue. He excels at fast build/measure/learn cycles, close collaboration with product and design, and creating internal tooling to surface key performance insights. As a founder and technical lead he has architected complex React/Redux apps, hypermedia APIs, and document transformation pipelines deployed on AWS. He volunteers technical skills to conservation projects like Coral Gardeners and has translated academic infectious-disease modeling into usable web tools adopted by NGOs and research institutions. That blend of rigorous quantitative research and pragmatic product engineering makes him adept at turning complex requirements into measurable, production-ready outcomes.
13 years of coding experience
6 years of employment as a software developer
Master's degree, Ecology, Evolution, Systematics, and Population Biology, Master's degree, Ecology, Evolution, Systematics, and Population Biology at Ecole normale supérieureBachelor of Science - BS, Bachelor of Science - BS at AgroParisTech
Stackoverflow
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Github Skills (199)
digital-humanities10
storybook10
ui-components10
ontology10
testing10
drag10
firefox-addon10
pocket10
font-size10
shacl10
ember10
isolation10
fingerprinting10
duckduckgo10
javascript10
Programming languages (6)
Github contributions (5)
scienceai/docx-standard-scientific-style
Nov 2015 - Jan 2016
Contributions:1 PR, 311 pushes, 19 branches in 2 months
docxscientific
science-periodicals/bunyan-couchdb-stream
Aug 2015 - Jul 2019
A writable stream that writes log JSON objects (as generated by bunyan) to CouchDB / PouchDB
Contributions:9 commits, 7 pushes, 2 tags in 3 years 11 months
json-logwritablenodejsstreampouchdb
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