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PolakiniO/README.md
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Yuval Polak

Cybersecurity Engineer / Technical Lead

⚑ Building security tools, engineering systems, and governing how AI writes code

Profile Views

I work on security the way it actually behaves in production: messy, interconnected, and usually one bad assumption away from breaking.

I build, troubleshoot, harden, automate, and tear systems apart until the weak spots show up.


About Me

  • Cybersecurity Technical Lead with 5+ years of hands-on engineering experience across technology, finance, government, defense, and other enterprise environments.
  • Focused on security architecture, engineering, and what really happens when controls meet production.
  • Deep into DLP, SSE, SASE, cloud security, detection engineering, endpoint protection, and BAS.
  • Used to operating in real enterprise environments across 50+ organizations, not isolated demo labs.
  • Strong bias for troubleshooting, root cause analysis, secure integration, and understanding system behavior under pressure.
  • I also build personal tools and side projects because good ideas usually start by solving annoying real problems.

Worked across 50+ enterprise environments, dealing with real systems, real constraints, and real failures.


Projects

Built a governance framework that makes AI coding agents (such as Codex and similar tools) behave like disciplined senior engineers when interacting with a codebase.

Instead of ad-hoc prompts and inconsistent outputs, it introduces a reusable layer that standardizes implementation, refactoring, and code review across repositories.

Key capabilities:

  • Repository-level governance using AGENTS.md
  • Structured workflows via a portable playbook system
  • Reusable skill modules for consistent AI behavior
  • Enforced output structure for code reviews and implementations
  • Separation between generic governance and repo-specific logic
  • Support for multiple use cases (security workflows, backend services, data pipelines)
  • Presentation-ready output modes for demos and documentation
  • Designed to work across AI agents, tested primarily with Codex

Designed as a drop-in layer that can be adopted without modifying runtime code or introducing dependencies.

The project reflects a shift from using AI as a helper to treating it as an engineer operating within defined boundaries, contracts, and review standards.


Built a gamified offensive security learning platform in ~3 days, designed to make hands-on cybersecurity practice accessible directly from a mobile device and browser.

The project started from a simple question: can offensive security be practiced meaningfully from a phone? HackQuest Academy answers that by turning training into an interactive, game-like experience instead of a static lesson library.

Key capabilities:

  • Structured learning paths with progressive difficulty
  • Interactive challenges, quizzes, and CTF-style missions
  • Simulated terminal experience directly in the browser
  • Gamification system with XP, levels, streaks, and skill trees
  • Leaderboards and public user profiles
  • Completion certificates for learning tracks
  • Fully mobile-first design with no installation required
  • AI-assisted content generation and AI Tutor support
  • Feedback systems, issue reporting, and an internal AIFixLog improvement loop
  • Dynamic curriculum architecture for extending tracks without structural rewrites

The project reflects rapid prototyping, product thinking, and using AI to accelerate both development and content creation.


Built a lightweight macOS utility that automatically restores SMB mounts, reducing disruptions caused by sleep, network changes, and VPN reconnects.

What began as a personal workaround evolved into a more polished tool focused not just on reconnecting shares, but on making installation, day-to-day use, troubleshooting, and clean removal practical for real users.

Key capabilities:

  • Automatic SMB reconnection with smart connectivity checks
  • Interactive and flag-based installation flows
  • Native macOS LaunchAgent integration
  • Finder and Keychain usage for secure credential handling
  • Runs fully in user space without sudo or system modifications
  • Clean uninstall with no leftover artifacts
  • Logging and debugging support for transparency and troubleshooting

The project highlights the shift from a script that works on one machine to a tool others can install, trust, and remove with confidence.


Built a lightweight native Windows alternative to the Linux touch command, eliminating the need to switch to WSL for simple file creation and timestamp operations.

The tool is primarily implemented in C++ with the Win32 API, with an emphasis on performance, full Unicode support, precise timestamp handling, and a standalone user experience without external dependencies.

Key capabilities:

  • Create new files or update timestamps on existing ones
  • Fine-grained control over access and modification times
  • Copy timestamps from reference files
  • Support ISO and POSIX-style timestamp formats
  • Work with files, directories, and Windows wildcards
  • Fully standalone operation with no external dependencies
  • Additional implementations in C, Python, and Bash for portability and simplicity

The development process also leveraged OpenAI Codex, requiring careful prompt engineering and precise requirement definition while building in a low-level language.


Built an interactive portfolio website that simulates a full operating system environment, creating a unique and immersive way to explore professional experience and projects.

CyberFolio combines a graphical desktop interface with a command-line experience, allowing users to navigate the portfolio in multiple ways, similar to a real OS.

Key capabilities:

  • Desktop-like environment with dynamic taskbar and draggable windows
  • Matrix-inspired background for a cyber-themed experience
  • Fully interactive GUI with resizable application windows
  • Built-in terminal for command-line navigation
  • Hybrid interaction model combining CLI and GUI
  • Included applications for About Me, Experience, Skills, Projects, Education, Certifications, Military Service, Contact Me, and an embedded web browser

The project focuses on creating a memorable user experience while showcasing technical skills, blending frontend development with system-inspired design.


Tech Stack

Python PowerShell Bash Docker AWS Kubernetes SQL Cloudflare Azure Linux Windows macOS


Skills

Security Engineering & Architecture

  • Secure architecture design
  • Detection engineering
  • DLP policy design and optimization
  • Breach and Attack Simulation (BAS)
  • Threat simulation and validation
  • Cloud security (AWS, SSE, SASE)
  • Security controls design and hardening

Automation, Scripting & Tools

  • Python
  • PowerShell
  • Bash / shell scripting
  • API integration and automation
  • Security tool development
  • Git / version control

Infrastructure, Systems & Networking

  • Enterprise networking and firewall architecture
  • Windows and Linux server administration
  • Virtualization (VMware)
  • Active Directory and enterprise services
  • Endpoint and network protection
  • Hybrid and on-prem environments

Implementation & Technical Delivery

  • Complex system integration
  • Technical troubleshooting and root cause analysis
  • High- and low-level design (HLD / LLD)
  • Technical documentation and architecture diagrams

Leadership & Collaboration

  • Technical project leadership
  • Engineering mentoring
  • Cross-functional collaboration
  • Professional services delivery

GitHub Stats

GitHub Stats Top Languages GitHub Streak


Mindset

  • Build things that solve real friction.
  • Security should survive contact with production.
  • If a tool looks good but fails under load, edge cases, or bad assumptions, it is not done.
  • Understanding behavior matters more than memorizing features.
  • I like systems you can trust, scripts that earn their keep, and troubleshooting that ends with a root cause.

Pinned Loading

  1. MacMountSMB MacMountSMB Public

    MacMountSMB is a lightweight macOS utility that keeps SMB network drives mounted automatically across sleep, reboots, and network changes.

    Shell 1

  2. WTouch WTouch Public

    WTouch is a native Windows implementation of the GNU touch command, enabling fast file creation and timestamp manipulation without WSL or environment switching.

    PowerShell 1

  3. AI-Engineering-Playbook AI-Engineering-Playbook Public

    Make AI coding agents behave like senior engineers - structured, consistent, and risk-aware by design.

    2