Josh Karasik on a rooftop with the Los Angeles skyline at night

software engineer at PennyMac

Josh Karasik

i like building things that actually make people's lives better.

work

now

PennyMac logo

PennyMac

software engineer

PennyMac is one of the biggest mortgage companies in the US. I'm on the team that builds and runs the platforms the whole business runs on, so I touch every application the company uses to keep its services going. That's tooling, telemetry, and honestly a lot of AI lately.

100%uptime

AWS · Serverless · TypeScript · AI

before

International Medical Devices Inc.

lead developer

I built an app with a surgeon in Beverly Hills and his team. It uses a custom AI model so patients can see their results before surgery. It's on iOS and Android, distributed in 60+ countries, works in over 50 languages, and it's built to be accessible.

30,000+active users
Himplant on the App Store, AI Enhancement Simulator

React Native · Serverless AI · GPU inference

earlier

RoviSys logo

RoviSys

software engineer

I built the GUIs that data center operators use every day, for a Google AI data center project. I coordinated with the team in Arizona to implement and test my GUIs on site.

$1.2M+delivered for the client

GUI systems · Industrial automation

start

political science major

I studied political science and interned at the Senate in Washington DC. After that I knew law wasn't right for me, and I'd loved tech ever since I was little. A friend took me out to a Thai restaurant and told me I should look into coding, and I literally fell in love. The idea that we can build things that improve other people's lives is incredible to me, and I get so passionate when something I build actually provides value and helps others.

outside of work

Josh at a grand piano

I've been playing piano since I was four years old and it's my passion. I'm currently working on Jarrod Radnich's version of Pirates of the Caribbean.

TypeScript · Python · Swift · React · Next.js · React Native · AWS · PostgreSQL · LLMs

say hi.

© 2026 Josh Karasik