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John UserJU
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John User

@johnuser45

I build hardware-integrated scientific instrument software, firmware, and reliable delivery pipelines.

United States
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At Revvity, I lead software delivery for the Celigo and Cellaca scientific instrument product lines, coordinating senior engineers and QA through releases spanning dozens of features. I build C#/.NET and WPF systems that connect precision hardware, imaging, analysis, and data workflows.

I've integrated FLIR camera systems, redesigned optical-path motion architecture, and built motor-controller software for multi-axis stages. I also delivered Acapella REST service integration, Phenologic AI integration, and automation capabilities designed for reliable instrument operation.

Previously at PerkinElmer and Nexcelom Bioscience, I architected the Cellaca hardware abstraction layer for motors, LEDs, filters, shutters, and autofocus. I also refactored STM32 firmware, developed SDKs for external instrument automation, and implemented FDA 21 CFR Part 11 audit trails.

Across my work, I combine C#, C++, embedded development, multithreaded systems, CI/CD, and regulated-life-sciences product delivery. I've resolved more than 500 Celigo bugs, improved concurrency reliability, and built GitHub Actions and Jenkins pipelines for software, firmware, packaging, and deployment.

Experience

Work history, roles, and key accomplishments

Revvity logoRE
Current

Principal Software Development Engineer

Jan 2025 - Present (1 year 8 months)

Leading technical direction and architecture for the Celigo and Cellaca product lines, mentoring senior engineers, and driving CI/CD and installer improvements.

Education

Degrees, certifications, and relevant coursework

University of San Diego logoUD

University of San Diego

Bachelor of Arts, Computer Science

2008 - 2011

Earned a Bachelor of Arts in Computer Science from the University of San Diego.

Pepperdine University logoPU

Pepperdine University

Activities and societies: Regents Scholar; NCAA Division I Baseball recruit

Attended Pepperdine University as a Regents Scholar and NCAA Division I Baseball recruit.

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