Joshua Cajetan Rebelo

WORK HISTORY

EDUCATION

SKILLS

ABOUT JOSHUA CAJETAN REBELO

Joshua Cajetan Rebelo is a Senior Key Expert – Cybersecurity at Siemens Limited, with around 22 years of hands‑on experience across enterprise, cloud, and industrial cybersecurity environments. He has previously worked as a Security Researcher and Security Architect at Siemens Services & Technology, Intel Security Group (Intel Corporation), and McAfee India, contributing across both product and enterprise security domains.Joshua is recognized for combining deep technical expertise with practical leadership in complex security programs. His core areas of specialization include Cloud Security, Secure Architecture, OT Security, IT‑OT Convergence, Product Security, Risk Assessments, Threat Intelligence, and Cybersecurity Due Diligence.He has led and executed high‑impact OT security engagements, including substation hacking demonstrations for prospective customers and end‑to‑end OT security implementation for a major petrochemical organization. He was also a key contributor to the CERT‑In empanelment of Siemens Limited, supporting regulatory alignment and organizational readiness.With a strong focus on secure‑by‑design and innovation, Joshua holds five issued patents and has authored two technical publications at PNSQC, covering Unit‑Level Secure‑by‑Design approaches and advancing the Product Security Maturity Model.In addition to his technical depth, Joshua is a trusted mentor and leader, experienced in demand management, leadership‑team engagement, strategic planning, and project execution. He is known for bridging the gap between engineering teams, business stakeholders, and leadership, enabling informed risk‑based security decisions.