Karl Baum
Chief Technology Officer at J2 Health
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolKarl Baum is a seasoned technology leader and CTO with 14 years of experience scaling engineering teams and product platforms from startup to growth stages. He co-founded and led engineering at VTS through Series C, growing the team from a single engineer to 60+ while instituting continuous delivery and TDD practices. Karl combines hands-on full-stack development—evidenced by contributions optimizing Ruby production tooling like Coverband—with strategic product partnerships and integrations across fintech, e-commerce, and underwriting systems. He has led engineering for complex financial and consumer platforms (Goldman Sachs, LiftForward, withco) and built integrations with Plaid, Marqeta, Klarna, and major merchant ecosystems. Based in New York, he excels at bridging product, data, and go-to-market teams to improve conversion and underwriting outcomes. Colleagues describe him as a pragmatic builder who still dives into code to solve performance and architecture challenges.
14 years of coding experience
24 years of employment as a software developer
BS, Computer Science, BS, Computer Science at State University of New York at Binghamton
Github Skills (5)
code-coverage10
performance-optimization10
redis10
ruby10
test-automation8
Programming languages (6)
Github contributions (5)
danmayer/coverband
Dec 2015 - Aug 2021
Ruby production code coverage collection and reporting (line of code usage)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 reviews, 520 commits, 192 PRs in 5 years 8 months
Contributions summary:Karl primarily focused on optimizing the code coverage reporting and storage functionality of the Coverband project. Their work included implementing Redis pipelining for improved performance, enabling testing with C extensions, and refactoring aspects related to thread tracing and file filtering. They also added benchmarks and support for Ruby 1.9.
sinatraline-of-coderack-middlewarerailsreporting
kbaum/browser-timezone-rails
Jan 2013 - Jul 2019
Rails engine that sets the Rails timezone to the browser time zone for each request.
Contributions:51 commits, 14 PRs, 21 pushes in 6 years 7 months
zonebrowserrailsrails-engineruby
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