James Kleeh
Senior Software Engineer at HubSpot
Youngstown, Ohio, United States
Summary
🤩
Rockstar🎓
Top SchoolJames Kleeh is a Senior Software Engineer with 11 years of experience building full-stack web applications and backend systems, now based in Youngstown, Ohio. He has a strong track record at companies from startups to Amazon and HubSpot, and deep expertise in JVM ecosystems evidenced by substantive contributions to notable open-source projects like Micronaut, Grails, and Apache Groovy. His work often focuses on improving data handling, JSON conversion, WebSocket reliability, and datastore integrations—practical fixes that keep frameworks stable for large ecosystems. A former principal/distinguished engineer and university ERP lead, he blends hands-on coding with mentoring and client-facing technical leadership. Notably, he has navigated both framework internals and production delivery, demonstrating an uncommon comfort moving between core library patches and product-facing features.
11 years of coding experience
16 years of employment as a software developer
Bachelor of Applied Science (BASc) Computer Information Systems, Bachelor of Applied Science (BASc) Computer Information Systems at Youngstown State University
Stackoverflow
12,128reputation
1.2mreached
446answers
33questions
grails
top-1%
groovy
top-5%
jquery
top-5%
ajax
top-5%
javascript
top-5%
angularjs
top-5%
Github Skills (42)
json10
grails10
groovy10
data-set10
configuration-management10
micronaut10
java10
data-model10
mongodb-database10
javas10
hibernate10
sql10
user-data10
mongodb10
javascript9
Programming languages (20)
Github contributions (5)
micronaut-projects/micronaut-core
Sep 2017 - Sep 2022
Micronaut Application Framework
Role in this project:
Back-end Developer
Back-end DeveloperContributions:28 releases, 251 reviews, 2571 commits in 5 years
Contributions summary:James contributed to the Micronaut Application Framework by fixing bugs related to WebSocket client behavior and checkstyle. The user also made updates to tests related to Groovy and contributed to improvements in various areas such as HTTP error responses and the handling of query parameters. In addition, the user integrated with existing codebases to ensure compatibility and maintenance.
micronautmicroservicesjavakotlingroovy
apache/grails-core
Nov 2015 - Jun 2021
Grails - the Web Application Framework
Role in this project:Back-end Developer
Back-end DeveloperContributions:483 commits, 136 PRs, 368 pushes in 5 years 8 months
Contributions summary:James primarily contributed to the Grails web application framework by implementing and improving support for Groovy-based configurations within Grails plugins. They focused on enhancing the loading of configuration files and associated tests. The user introduced features to support both `plugin.yml` and `plugin.groovy` files, with associated exception handling and code refactoring.
grailsgroovy
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