I’m Evan Hahn, a computer programmer.

I currently work at Ghost, a nonprofit that builds software for independent publishers.

In the past, I’ve worked at:

• Awana Digital, building Node.js-powered peer-to-peer software to help Indigenous communities map and monitor their land
• Signal, the encrypted messenger, building their iOS and Windows/macOS/Linux apps
• Airtable, the low-code database product, maintaining their REST API and running their bug bounty program
• several other places

I maintain some open source projects:

• Helmet.js, a web security module, is my most popular with over 226 million downloads in 2025
• Humanize Duration turns milliseconds into duration strings
• UTF-21, a toy character encoding
• see more

I’ve written a few things:

• Express in Action, a Manning book
• JavaScript Testing with Jasmine, an O’Reilly book
• “The lone developer problem”
• “How I build software quickly”
• “The world’s smallest PNG”
• “Why does ‘👩🏾‍🌾’ have a length of 7 in JavaScript?”
• read more

I would love to hear from you. You can contact me:

• Email: [email protected]
• Mastodon: @[email protected]
• other ways