Coleman Kelleghan
Summary
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SeniorColeman Kelleghan is a Senior Software Engineer based in Denver with 10 years of hands-on experience building high-performance full‑stack applications, primarily in the JavaScript ecosystem. He specializes in React rendering performance and designing maintainable, well-tested Node APIs, often optimizing for milliseconds to improve user experience and accessibility. Coleman has led engineering teams at enterprise and startup levels, owning technical design, client communication, and production support while driving cross-team integrations and performance audits. His background spans building market-data platforms, real-time webhook integrations, and a paid fantasy sports product he developed and ran as a solo founder, demonstrating both product and operational chops. Comfortable working across React, Typescript, GraphQL, Node, Go, and Rails, he pairs deep frontend focus with backend service design for scalable, data-intensive applications.
10 years of coding experience
Github Skills (33)
command-line-tool8
java8
postgresql7
data-collection7
snowflake7
mysql7
nodejs7
databases7
mssql7
pipeline7
etl7
python7
microsoft-sql-server7
change-data-capture6
data-pipeline6
Programming languages (5)
Github contributions (5)
kelleghan1/portfolio_site
Sep 2023 - Sep 2025
Contributions:10 PRs, 30 pushes, 3 branches in 2 years
kelleghan1/dropzioApp2
Jun 2016 - Jul 2016
Contributions:55 commits, 1 push, 2 branches in 6 days
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