Joshua Callender
Senior Software Engineer at Sentry (sentry.io)
Oakland, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJoshua Callender is a senior software engineer with over a decade of experience building scalable web products and developer tooling, currently helping shape Sentry's full-stack platform. He has a track record of driving frontend performance and developer experience at Lyft—creating a shared web component library, service scaffolding that cut new-service time from weeks to minutes, and company-wide metrics automation. Earlier work includes maintaining one of the first Universal/Isomorphic JS frameworks at Change.org and contributing UI and API fixes to the widely used open-source Sentry project. Comfortable across front- and back-end stacks, Joshua has built systems supporting hundreds of thousands of concurrent users, mobile apps, and microservice architectures. Based in Oakland, he pairs hands-on engineering with mentorship, known for helping senior engineers grow into staff roles and for fostering cross-org collaboration.
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 (24)
apim10
typescript10
ui-design10
uid10
api10
front-end-development10
typescript-types10
typescripts10
react10
testing9
error-logging9
pytest9
python9
django9
error-log9
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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