Mark Hennessy
Software Engineer III at JPMorgan Chase & Co.
Columbus, Ohio, United States
Summary
👤
Senior🎓
Top SchoolMark Hennessy is a Senior Fullstack Software Engineer with 13 years of experience, currently building developer productivity tools at JPMorgan Chase. He brings Tech Lead experience from scaling fast-growing products—having stepped into a CTO role to stabilize critical go-lives, implement monorepos, and rework infrastructure across AWS, Heroku, Netlify, and Cloudflare. A detail-oriented advocate for code quality and developer experience, he’s driven projects to 100% TypeScript, tightened ESLint/Jest configs, and improved SSR and GraphQL performance in production Next.js apps. Comfortable across React, Node, GraphQL and payment integrations, he blends hands-on implementation with mentorship and rigorous code review practices. Based in Columbus, OH, he’s adept at turning urgent operational bottlenecks into long-term architectural wins.
13 years of coding experience
8 years of employment as a software developer
Master of Science - MS Computer Software Engineering, Master of Science - MS Computer Software Engineering at Carnegie Mellon University Silicon ValleyBachelor of Science Computer Science, Bachelor of Science Computer Science at Neumont College of Computer Science
English, German, Japanese
Github Skills (10)
trading9
forex9
trading-bot9
finance9
algorithm9
python8
trading-algorithms8
csharp8
algorithmic-trading7
quantconnect7
Programming languages (3)
Github contributions (5)
mark-hennessy/wanikani-vocab-note-linker
Nov 2019 - Jul 2026
Created with CodeSandbox
Contributions:11 PRs, 137 pushes, 18 branches in 6 years 9 months
reactjavascriptcodesandboxreactjstypescript
mark-hennessy/tws-cli
Sep 2016 - Nov 2017
Contributions:134 commits, 12 pushes, 1 branch in 1 year 2 months
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