Mike Johnson in

Mike Johnson

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Chief Technology Officer at Rosarium Health
📍 Simi Valley, California, United States

Mike Johnson is a co-founder and Chief Technology Officer with deep expertise in full-stack development, specializing in React, Python, and Go. A graduate of Regis University, he has a proven track record of leading engineering teams through major architectural rewrites that significantly improve platform performance. Colleagues describe him as a "genius" and a "code-warrior".

Beyond his technical leadership, Mike follows companies in the gaming and social event industries, such as Riot Games and Evite. His active GitHub profile demonstrates a passion for open-source software and exploring new technologies through personal coding projects. He is mission-driven, focusing his current efforts on technology for social good.

He co-founded a health-tech company that recently secured a seed round to pursue its mission of making homes safer.

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Experience
25 Years
Current Role
Chief Technology Officer
Job Level
Leadership
Location
Simi Valley, California, United States
Personality Overview

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Communication Style
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Priorities

Topics Mike cares about

Engineering Leadership
As a CTO and former Director of Engineering, he focuses on recruiting, technical mentorship, and managing teams to execute complex projects and improve processes.
Frontend Performance
He has led successful, large-scale frontend rewrites using React, resulting in dramatically improved Lighthouse scores and a 10% increase in user conversion.
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Career

Work history

4-2026
Chief Technology Officer
Rosarium Health
6-2023 - 4-2026
Director of Engineering
Vinovest
1-2023 - 6-2023
Director of Engineering
Vestiaire Collective
4-2022 - 3-2023
Principal Engineer
Vestiaire Collective
10-2019 - 4-2022
Principal Engineer
Tradesy
In the press

Media appearances

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Education
2010 - 2020
Bachelor of Science (BS)
Regis University
Social presence
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Behavioral profile

DISC profile (public)

DISC behavioral profile

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