Joshua Callender
Senior Software Engineer at Sentry (sentry.io)
Oakland, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJoshua Callender is a Senior Software Engineer in Oakland with over a decade of experience delivering performant web products and developer tooling. He was an early maintainer of Rendr (one of the first Universal JS frameworks) and at Lyft built core web systems—creating a shared component library, automated metrics tracking, and the @lyft/service scaffolding to spin up services in minutes. He now contributes full-stack improvements to Sentry, focusing on front-end UX fixes and backend integrations for a widely used error-tracking platform. A regular conference speaker and mentor, he helps engineers grow into senior and staff roles and has architected APIs handling 300,000+ concurrent users.
11 years of coding experience
16 years of employment as a software developer
Bachelors of Science, Computer Science, Bachelors of Science, Computer Science at Ohio University
Github Skills (32)
apim10
typescript310
ui-d10
typescript10
typescript210
ui-design10
api10
front-end-development10
typescript-types10
typescripts10
frontend-development10
react10
testing9
front-end9
errorlog9
Programming languages (8)
Github contributions (5)
getsentry/sentry
Jan 2024 - Apr 2025
Developer-first error tracking and performance monitoring
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:885 reviews, 182 PRs, 761 pushes in 1 year 2 months
Contributions summary:Joshua made contributions to the Sentry project's front-end and back-end components. They fixed UI issues related to the alerts section and the release page, modifying React components, TypeScript files, and Python test files. The user also worked on migrating a modal to use an API hook instead of an AsyncComponent, demonstrating expertise in React, API integration, and refactoring. Additionally, the user focused on improving the user interface and maintaining the application's functionality by addressing bugs and making enhancements to the user experience.
monitorpythonsentrydjangoerror-monitoring
rendrjs/rendr-handlebars
Nov 2014 - Feb 2016
Contributions:9 releases, 35 commits, 33 PRs in 1 year 3 months
templatehandlebarshandlebars-templateadapter
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