Денис

DENYS STADNIK
SYSTEMS ENGINEERING | C/C++ | WINDOWS KERNEL | AMD SVM
Khmelnytskyi, Ukraine • Remote • [open contact info](look above in the "contact info" section) • [open contact info](look above in the "contact info" section)
github.com/DeFexNN • github.com/DeFexNN/hypervisor_spoofer • github.com/DeFexNN/drivers-portfolio

PROFILE
Low-level C/C++ developer with independent software engineering experience focused on Windows kernel internals, AMD SVM
virtualization, paging, physical memory access and reverse engineering. Builds kernel-mode tooling and hypervisor systems;
interested in secure execution and systems reliability.

TECHNICAL SKILLS
C, C++, x64 Assembly, Python • AMD SVM, VMCB, VMEXIT, NPT, CR3, page tables • Windows Kernel, WDK, IOCTL, PE internals •
Linux, Git, IDA, VMware, QEMU/KVM, Docker

PROFESSIONAL & LEADERSHIP EXPERIENCE
Freelance Software Engineer | Self-employed | Jan 2020 – Present
Developed and commercialized proprietary software; worked with C/C++, low-level Windows components and independent software
delivery. Selected technical work is detailed below.

Technical Team Lead | 518&imposter CTF Team | Nov 2025 – Present
Lead team strategy, task delegation and technical collaboration in cybersecurity competitions; mentor teammates and coordinate
challenge-solving efforts.

Online Store Manager | tut.ua | Apr – Jun 2026
Supported online retail and wholesale operations, customer communication and day-to-day coordination.

Laboratory Assistant | Khmelnytskyi National University | Jul – Dec 2025
Assisted with network installation and configuration of network equipment.

SELECTED SYSTEMS ENGINEERING PROJECTS
AMD SVM Hypervisor | C++, x64 Assembly, Windows Kernel | GitHub: DeFexNN/hypervisor_spoofer
Developed and substantially extended an AMD SVM hypervisor codebase: VMCB setup, VMEXIT handling, CPUID/MSR interception,
per-CPU virtualization, NPT shadow mappings, large-page splitting and physical-memory operations.
• Observed 72+ hours of continuous operation under active desktop and gaming workloads without BSOD or visible instability on
one system.
Windows Kernel Drivers Portfolio | C/C++, WDK | GitHub: DeFexNN/drivers-portfolio
Built kernel-mode process memory tooling using CR3-aware translation, page-table walking and physical memory access;
implemented user/kernel IOCTL communication and researched Windows driver, process and PE internals.

CYBERSECURITY COMPETITIONS
Captain, 518&imposter: 1st place at FlyForge CTF (SET University / IronCyber, Nov 2026); team swept all four awards at Cybexer Q2
League, Zhytomyr Polytechnic (Nov 2026), including the top three individual places and the top female competitor award (UAH 40,000
in combined prize certificates). Previously: 3rd among 86 teams in Cyber Security Universiade: Second Edition qualifier; co-created
KhmnuCTF-2026 challenges.

EDUCATION & LANGUAGES
BSc Cybersecurity | Khmelnytskyi National University | 2024–2028 (expected) • English: Upper-intermediate (self-reported) •
Ukrainian: Native • SOC Analyst training certificate