Jonas Badalič
Senior Software Engineer at Sentry
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolJonas Badalič is a staff software engineer in New York with nine years of experience building high-performance developer tools and observability systems, currently leading design engineering at Sentry. He spans full-stack work—from React UI and design systems to C++ Node.js bindings—and architected Sentry’s NodeJS and JS self-profiling solutions used by hundreds of thousands weekly. Previously at Specto (acquired by Sentry) and Algolia, he built WebGL flamegraph visualizations and the first Analytics Event SDK that tied search relevance to real-world performance. Jonas is an active open-source contributor to projects like Node.js and the Sentry SDKs, with a track record of squeezing big performance wins (e.g., 50% TypeScript type-check speedups) through profiling and careful engineering. Once a basketball coach and player, he brings a curious, team-focused mindset to mentoring and product-facing technical decisions.
9 years of coding experience
7 years of employment as a software developer
Mechatronics, Robotics, and Automation Engineering, Mechatronics, Robotics, and Automation Engineering at TSC Nova GoricaGea College
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (20)
filesystem10
javascript10
testing10
typescript10
fs10
sdk10
typescript-types10
nodejs10
typescripts10
react10
tls129
monitoring9
tls139
error-log9
profiling9
Programming languages (17)
Github contributions (5)
getsentry/sentry
Dec 2021 - Jan 2023
Developer-first error tracking and performance monitoring
Role in this project:
Back-end Developer & Front-end Developer
Back-end Developer & Front-end DeveloperContributions:3184 reviews, 708 commits, 3228 PRs in 1 year 1 month
Contributions summary:Jonas appears to be a full-stack developer, contributing to both front-end and back-end code. They implemented React-based propType validators for various data types used within the Sentry platform. They also removed a dependency on a prop types package. Additionally, the user worked on updating, and fixing existing React components and libraries.
performance-monitoringcrash-reportingcrash-reportserror-monitoringmonitoring
getsentry/sentry-javascript
Dec 2021 - Dec 2022
Official Sentry SDKs for JavaScript
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:135 reviews, 40 commits, 134 PRs in 1 year
Contributions summary:Jonas made extensive contributions to the Sentry JavaScript SDK, focusing on improving type safety and code maintainability. The user refactored and deprecated several types related to the Sentry API, and improved the promise buffer utility. The user also implemented and refactored self profiling code for javascript, and made some improvements to the node contextlines integration. They also updated tests and fixed imports.
javascriptsentrycrash-reportingravenjavascript-client
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