John Kreiner
Principal, Fractional CIO/CTO Services
Based in United States · 40+ years experience
Summary
Senior Technology & Operations Executive | Regulated Industries | Banking, Healthcare, and Mission-Critical Organizations
About
I am a senior technology and operations executive who aligns technology, risk, and execution to support sustainable growth in regulated and mission-critical environments.
I began my career in banking on the business side, working in branch operations and the back office before transitioning into technology. That foundation continues to shape how I lead: technology exists to serve the business, protect the institution, and enable disciplined growth.
Across VP and C-level roles, I have led organizations through modernization, scale, and complex regulatory landscapes spanning financial services, healthcare, behavioral health, and other highly regulated sectors. My experience includes enterprise systems, security, operational resilience, and global delivery models, with direct accountability to CEOs, boards, and investors.
I am known for bringing clarity where technology has become fragmented, strengthening governance and accountability, and building teams that balance tactical execution with strategic direction. My focus is on building organizations that are secure, resilient, and positioned for long-term value creation.
Beyond my executive roles, I serve in advisory and governance capacities supporting workforce development and community institutions. I am particularly engaged in mentoring emerging technology professionals and applying technology skills in service-oriented settings.
I am most interested in leadership opportunities where trust, stability, and thoughtful modernization matter, especially within financial services, healthcare, and mission-driven organizations.
Skills
Engineering Leadership, Cloud & Infrastructure, Cybersecurity, Data & AI, DevOps, Software Architecture, Vendor Management, Governance & Risk, M&A / Due Diligence, Platform Modernisation
Regions covered
North America, Europe, United Kingdom, Germany, Ireland, United States
Industry experience
Not-for-profit, Fintech, Professional Services, SaaS, Education, Healthcare
At a glance
John brings hands-on experience across Engineering Leadership, Cloud & Infrastructure, Cybersecurity, Data & AI, DevOps, Software Architecture and 4 other areas. Available for engagements across North America, Europe, United Kingdom, Germany, Ireland, United States. Industry experience includes Not-for-profit, Fintech, Professional Services, SaaS, Education and 1 more.
How fractional CTO engagements with John work
John works on a fractional basis — typically one to three days a week for an agreed engagement length — so you get senior technical leadership without the cost or commitment of a full-time hire. Engagements commonly include technical due diligence, board reporting, engineering team leadership, technology strategy, architecture reviews, hiring support, and stepping in as interim CTO during a transition.