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ataberk-xyz/README.md

Ataberk Yavuzer

Smart Contract Auditor & Offensive Security Engineer — 7+ years across Web3 and traditional security.

Pentesting (web · network · Active Directory) → blockchain security (Solidity · Move). Ex-Principal Smart Contract Auditor @ Hacken · Ex-Lead Offensive Security Engineer @ Halborn. I break things, then build tools so they break less.

OSCP · OSWE · CRTP


Focus

  • Smart contract audits — Solidity & Move; DeFi, protocols, bridges. Manual deep-dive, not just tooling.
  • Offensive security — web, network & Active Directory; red-team mindset.
  • Security tooling — AI-assisted automation and agentic workflows.

Projects

gossipcat · TypeScript MCP Multi-agent A multi-agent code-review orchestrator that filters LLM hallucinations. Every finding must cite a real file:line; peer agents verify the citation against actual source — a mechanical check, not LLM-as-judge. Verified findings and caught hallucinations become grounded reward signals that update per-agent competency scores. In-context reinforcement learning at the prompt layer — no weights touched.

Gamebrew · C# Unity 6 MCP A self-hosted bridge that hands your running Unity game to an AI agent — walk the player, orbit a prop to inspect it, capture the view, read live scene state, all over one loopback MCP port. No cloud, no SDK lock-in.


Security advisories

Vulnerabilities I found and responsibly disclosed:

Package Severity Advisory
install-artifact-from-github High (7.5) GHSA-88q3-gch3-5396 — install-time RCE (CWE-494)
stream-json Moderate (6.2) GHSA-528h-pc64-c93x — event-loop DoS (CWE-407)
node-re2 Moderate (6.2) GHSA-6hxr-mr5r-9836 — infinite loop / memory DoS (CWE-835)
node-re2 Moderate (5.7) GHSA-ff84-5f28-78qj — OOB read / crash (CWE-125)
node-re2 Moderate (6.2) GHSA-8hcv-x26h-mcgp — process abort DoS (CWE-617)
Kentico CMS Medium (5.4) CVE-2019-19493 — stored XSS (CWE-434)

Skills

Smart contracts — Solidity · EVM · Move (Aptos, Sui, IOTA) · Foundry · DeFi security Offensive — internal & external pentest · web app security · Active Directory (Kerberoasting, NTLM relaying, Pass-the-Hash) Reversing & vuln research — n-day research · patch diffing · WinDbg · PoC development Build & AI — Python · TypeScript · Node.js · multi-agent orchestration (MCP) · Claude Code · Cursor


Blog · LinkedIn

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  1. gossipcat-ai/gossipcat-ai gossipcat-ai/gossipcat-ai Public

    Multi-agent code review mesh — orchestrates AI agents from multiple providers to review code in parallel, cross-review each other's findings, and build accuracy profiles over time. Agents that catc…

    TypeScript 38 5

  2. Gamebrew Gamebrew Public

    Unity MCP that turns AI agents into hands-on playtesters — they walk, look, capture, inspect, and test your running game so you catch bugs and rough spots while you build. Self-hosted, multi-agent …

    C# 1