Jeff Johnson
Engineering Manager at Digital Ruby, LLC - Security Software Services
Austin, Texas Metropolitan Area United States
Summary
🤩
Rockstar🎓
Top SchoolJeff Johnson is an experienced engineering manager and founder with over two decades in technology and 14 years in formal engineering roles, currently leading teams at ServiceTitan while running his long-running indie company Digital Ruby. He blends people-first leadership with deep hands-on expertise across mobile, backend, and game/graphics work—contributing notable open-source iOS image-processing filters to the popular GPUImage project and making low-level RTOS and C# contributions in embedded systems. Jeff has led engineering organizations through platform modernizations (.NET, cloud, Kubernetes) and built cost-effective security tools, games, and widely used Unity assets, showing an uncommon mix of architecture, product intuition, and creator entrepreneurship. Known for mentoring and prioritizing kindness and motivated teams, he treats AI as a useful tool rather than the central answer, focusing on durable human-driven outcomes. Based in the Salt Lake City area, he pairs pragmatic execution with creative side projects—like an art app and AI-assisted fiction—that reflect a curiosity for applied technology beyond pure enterprise delivery.
14 years of coding experience
23 years of employment as a software developer
High School Diploma, High School Diploma at Kalamazoo Central High School (Michigan)CS, Computer Science and Information Systems, CS, Computer Science and Information Systems at Utah Valley University
Stackoverflow
20,784reputation
4.6mreached
280answers
109questions
pdf
top-1%
code-signing
top-5%
ios
top-5%
Github Skills (20)
objective-c10
ios10
image-processing10
gpu-programming10
pdf10
coco10
opengl-es10
game-development10
cocos2d-x10
code-signing9
integrate9
asp-net-core9
physics-engine9
screen-shot9
physics9
Programming languages (16)
Github contributions (5)
BradLarson/GPUImage
Nov 2012 - Sep 2013
An open source iOS framework for GPU-based image and video processing
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:31 commits in 10 months
Contributions summary:Jeff primarily contributed to the `GPUImage` framework by adding new image processing filters and enhancing existing ones. Their work included implementing filters like `GPUImageVignetteFilter`, `GPUImagePixellateFilter`, `GPUImageBulgeDistortionFilter`, and `GPUImageGaussianBlurFilter`, as well as improving the existing ones. They focused on features such as adding adjustable properties (center, radius, color) to the filters, addressing aspect ratio issues, and optimizing performance.
gpuios-frameworkvideo-processing
cocos2d/cocos2d-objc
Feb 2014 - Mar 2014
Cocos2d for iOS and OS X, built using Objective-C
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:8 commits in 1 month
Contributions summary:Jeff primarily contributed to the `cocos2d-objc` repository, a game development framework for iOS. Their work involved bug fixes and refactoring within the framework's rendering and physics components. Specifically, the user addressed issues related to bitmap font labels, physics engine integration, and the iOS-specific CCDirector implementation. They also reverted a previous change and made performance improvements to bitmap font rendering.
cocos2d-xiosobjective-c
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