Alex Ionescu
Chief Technology Innovation Officer
Montreal, Quebec, Canada
Summary
🤩
Rockstar🎓
Top SchoolAlex Ionescu is a veteran technology executive and kernel engineer with 22 years of experience spanning OS development, security research, and product leadership, currently serving as Chief Technology Innovation Officer at CrowdStrike. He combines deep hands-on expertise in Windows kernel internals, ARM embedded kernel work (including past iOS team contributions), and low-level hypervisor/UEFI projects with senior leadership of large multi-platform endpoint engineering teams. Founder of Winsider Seminars and a long-time ReactOS contributor, he blends public-facing technical training and authorship with substantial open-source work on core NT-compatible kernel components and a compact Intel VT-x hypervisor. His career repeatedly bridges research and production—turning proof-of-concept technologies (VT, TPM, UEFI, hypervisor techniques) into shipped security features and patents. Based in Montreal, he also advises multiple security startups and runs a consulting practice, reflecting a balance of strategic vision and gritty systems-level coding. Not obvious at first glance: he has repeatedly led kernel redesign efforts (memory manager, portability layers) that enabled major platform portability and productization.
21 years of coding experience
24 years of employment as a software developer
Master's degree Informatics and Cyber Security, Master's degree Informatics and Cyber Security at University of California, BerkeleyDEC — Health Sciences Health Science, DEC — Health Sciences Health Science at CEGEP - John Abbott CollegeBachelor's degree Computer Science, Bachelor's degree Computer Science at Concordia University
English, French, Spanish, Romanian, Italian, Chinese
Github Skills (20)
bootloader10
assembly10
system-programming10
hyper-v10
memory-management10
c1110
c1710
kernel10
hyper10
hypervisor10
u-boot10
x86-6410
kernel-mode10
assembler10
boot10
Programming languages (6)
Github contributions (5)
ionescu007/SimpleVisor
Mar 2016 - Aug 2018
SimpleVisor is a simple, portable, Intel VT-x hypervisor with two specific goals: using the least amount of assembly code (10 lines), and having the smallest amount of VMX-related code to support dynamic hyperjacking and unhyperjacking (that is, virtualizing the host state from within the host). It works on Windows and UEFI.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:50 commits, 11 PRs, 78 pushes in 2 years 5 months
Contributions summary:Alex primarily focused on developing and maintaining an Intel VT-x hypervisor, as indicated by the assembly and C code changes. They addressed platform-specific issues by fixing compatibility problems in Windows (Redstone 2 fix) and UEFI environments. Contributions included context restoration, memory type adjustments, and the addition of power-state callbacks to manage sleep/hibernate cycles, and re-enabling EPT support with correct MTRR caching.
goalsvmxwindowshostlines
reactos/reactos
Nov 2005 - Dec 2005
A free Windows-compatible Operating System
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 6 pushes, 5 comments in 1 month
Contributions summary:Alex primarily worked on implementing and fixing low-level system components. Their contributions included adding and modifying core system functions related to path handling, session management, and memory management in the kernel. They also worked on implementing the BCD boot data functions, and contributed to a new file system (NPFS). Their work focused on maintaining existing functionality, with some support for new features such as console functions and basic EFI support.
driverskernelreactoswindowsgpl
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