01
Build dependable systems
Create software, infrastructure, and operating practices that remain understandable, secure, and reliable under real pressure.
Personal gateway30 years in technologySystems, operations & the real world
Carl Rosevear
Technology LeadershipReliabilitySecurityAutomationUS & Japan
Technology Leader, Builder & Entrepreneur
A personal gateway to my work, interests, and current ventures
I am a technology leader, builder, and entrepreneur with 30 years of experience spanning software engineering, large-scale infrastructure, operations, and executive leadership. This site is the best place to understand how I think, what I am working toward, and where a distinctive challenge might overlap with my experience.
For company building, acquisitions, and new lines of business, visit Arugula Holdings. For fractional CTO and technology consulting, visit Seika Advisors. I also remain open to unusual, well-defined problems that fit my background and interests.
Carl Rosevear
At a glance
Engineer to executive30 years in technology
Startups to global scaleTwitter, Microsoft & startups
United States & JapanCross-border perspective
Practical and reliability-mindedSystems thinking
Interests & goals
What I am interested in accomplishing
I am drawn to work where technical depth, operational judgment, and real-world systems meet.
02
Bridge the United States and Japan
Develop practical relationships and ventures that connect technology, people, and opportunities across both countries.
03
Solve unusual operational problems
Apply engineering, automation, communications, aviation, and automotive experience when standard approaches do not quite fit.
Where I work
Where my company work lives
These organizations carry the formal business work. This personal site connects you to the right place.
Arugula Holdings
Owner and Managing Partner
My holding company for building and acquiring businesses, developing new lines of business, and pursuing long-term US–Japan opportunities.
Seika Advisors
Founder and Principal Advisor
My fractional CTO and technology consulting practice, focused on helping leaders make sound technology decisions and build stronger organizations and systems.
Security
Security, privacy, and resilient operations
Security is part of how I think about systems—not an afterthought. I am especially interested in pragmatic risk assessment, privacy, infrastructure hardening, reliable operations, and clear recovery paths for organizations and individuals with meaningful exposure.
- Practical security and privacy reviews
- Infrastructure hardening and operational resilience
- Secure handling of sensitive information
Connect directly
Have something unusual in mind?
If your need sits outside a standard category but connects with my experience, interests, or way of working, I am happy to hear about it. A concise description of the outcome, constraints, and why you think I may be a fit is the best place to start.
Use the contact form for a conversation, or the secure file transfer tool when sensitive files are part of the context.