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James Onnen Email & Phone Number

Senior Software Engineer at Roblox at Roblox
Location: San Francisco Bay Area, United States, United States 16 work roles 2 schools
1 work email found @roblox.com 2 phones found area 913 LinkedIn matched
✓ Verified Jun 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email · 2 phones

Work email j****@roblox.com
Direct phone (913) ***-****
LinkedIn Profile matched
3 free lookups remaining · No credit card
Current company
Role
Senior Software Engineer at Roblox
Location
San Francisco Bay Area, United States, United States

Who is James Onnen? Overview

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Quick answer

James Onnen is listed as Senior Software Engineer at Roblox at Roblox, based in San Francisco Bay Area, United States, United States. AeroLeads shows a work email signal at roblox.com, phone signal with area code 913, and a matched LinkedIn profile for James Onnen.

James Onnen previously worked as Senior Software Engineer at Roblox and Chief Executive Officer at Studio Koi Koi. James Onnen holds Bacheler Of Computer Engineering, Computer Engineering from University Of Nebraska, Lincoln.

Company email context

Email format at Roblox

This section adds company-level context without repeating James Onnen's masked contact details.

{first_initial}{last}@roblox.com
86% confidence

AeroLeads found 1 current-domain work email signal for James Onnen. Compare company email patterns before reaching out.

Profile bio

About James Onnen

I'm a maker. Designing and creating new things with people is my hobby.

Listed skills include Leadership, Game Design, Java, Microsoft Office, and 26 others.

Current workplace

James Onnen's current company

Company context helps verify the profile and gives searchers a useful next step.

Roblox
Roblox
Senior Software Engineer at Roblox
AeroLeads page
16 roles

James Onnen work experience

A career timeline built from the work history available for this profile.

Senior Software Engineer

Current

San Mateo, California, US

* Programmed full stack for AI material generator* Designed and built economics, trust-and-safety for material generator* Provided significant feedback across Roblox for user UX* Delivered LLM conversational material generator* Proposed, designed, and programmed "Visualization Modes"

Jan 2023 - Present

Chief Executive Officer

Current

* Built up over 1 billion visits across 13 different experiences* Leading small team to build awesome stuff* Programming, building, game design, and more!

Mar 2020 - Present

Indie Game Developer, Roblox Platform

Current
Indie Game Developer

+ $10,000 of profit a year from game Whatever Floats Your Boat; logged 38 million plays.+ Roblox avatar made into series 1 toy, sold internationally at stores including Walmart and Target.+ In 2 of 3 official books, Roblox Top Adventure Games and Roblox Character Encyclopedia.+ Gathered 21,000 Twitter followers, @Quenty, well-known in Roblox’s development.

Sep 2009 - Present

Software Engineer Ii

Redmond, Washington, US

* Implemented Git line staging for Visual Studio* Helped create Git "Commit details" configuration* Improved VS startup time* Removed 1% of UI delays across Visual Studio* Mentored and onboarded intern, multiple team members* Helped setup integration testing* Helped with NGEN, icons, and other misc. feature sets across Visual Studios git integration

Aug 2020 - Dec 2022

Spring Accelerator

San Mateo, California, US

I'm working on my own game!

Feb 2020 - Aug 2020

Contractor

San Mateo, California, US

+ Developing open source in-game store for Roblox developers in Lua.+ Developed 4 official games sponsored by Nerf, Netflix, Marvel, and McDonald’s respectively.+ Made over 300 free plugins and assets; 340,000 sales and installs.

May 2015 - Feb 2020

Studio Team Intern

San Mateo, California, US

+ Shipped 10 new features for Roblox’s game editor, Roblox Studio, using C++.+ Wrote Lua API improvements used in millions of games on iOS, Android, PC, Mac, and Xbox.

May 2016 - Aug 2016

Software Engineering Intern

Redmond, Washington, US

May 2019 - Aug 2019

Raikes Design Studio Project Manager

Lincoln, NE, US

+ Led team of 6 to build a natural language generation library for NRC’s business insights.

Aug 2018 - May 2019

Software Engineering Intern

Redmond, Washington, US

+ Ensured August release of Microsoft’s new retail demo editor using C#, TypeScript, HTML.+ Prototyped new retail demo application in C#, convinced senior leaders to use technology.+ Automated retail demo editor data migration for 100 providers using Python 3.

May 2018 - Aug 2018

Software Engineering Intern

Olathe, KS, US

+ Programmed Garmin’s embedded flight controller in C to send autopilot diagnostics packets.+ Developed user interface to receive and display autopilot diagnostics in real time using C#.+ Responsible for identifying the problem and proposing alternative solutions.

May 2017 - Aug 2017

Computer Problem Solving Essentials Teacher Assistant

Lincoln, NE, US

+ Coached 2016 Raikes School Cohort in C, Java, SQL, discrete math, and object-oriented design.

Aug 2016 - May 2017

Senior Lakefront Instructor

H. Roe Bartle Scout Reservation

+ Led, supervised, and instructed 7 staff members.+ Worked alone and on a team to teach and supervised groups of up to 30 scouts aged 11-18.

May 2015 - Aug 2015

Lakefront Instructor

H. Roe Bartle Scout Reservation

+ Worked alone and on a team to teach and supervised groups of up to 30 scouts aged 11-18.

May 2014 - Aug 2014

Lakefront Instructor

H. Roe Bartle Scout Reservation

+ Worked alone and on a team to teach and supervised groups of up to 30 scouts aged 11-18.

May 2013 - Aug 2013
2 education records

James Onnen education

Bacheler Of Computer Engineering, Computer Engineering

University Of Nebraska, Lincoln

Education record

Shawnee Mission South High School
FAQ

Frequently asked questions about James Onnen

Quick answers generated from the profile data available on this page.

What company does James Onnen work for?

James Onnen works for Roblox.

What is James Onnen's role at Roblox?

James Onnen is listed as Senior Software Engineer at Roblox at Roblox.

What is James Onnen's email address?

AeroLeads has found 1 work email signal at @roblox.com for James Onnen at Roblox.

What is James Onnen's phone number?

AeroLeads has found 2 phone signal(s) with area code 913 for James Onnen at Roblox.

Where is James Onnen based?

James Onnen is based in San Francisco Bay Area, United States, United States while working with Roblox.

What companies has James Onnen worked for?

James Onnen has worked for Roblox, Studio Koi Koi, Indie Game Developer, Microsoft, and Nrc Health (National Research Corporation).

How can I contact James Onnen?

You can use AeroLeads to view verified contact signals for James Onnen at Roblox, including work email, phone, and LinkedIn data when available.

What schools did James Onnen attend?

James Onnen holds Bacheler Of Computer Engineering, Computer Engineering from University Of Nebraska, Lincoln.

What skills is James Onnen known for?

James Onnen is listed with skills including Leadership, Game Design, Java, Microsoft Office, Problem Solving, Powerpoint, Lua, and Microsoft Excel.

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