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alexanderzack

Alexander Hearn

@alexanderzack

AI Security Specialist LLM Red Teaming and Prompt Injection Testing

United States
English
About me
I'm Alexander Hearn, a Cybersecurity Specialist at Handshake, where I red-team LLM systems. I earned a B.S. in Computer Science (Cybersecurity specialization) from the University of Maryland and hold a GISF certification. I help teams find and fix security weaknesses in their AI products: - System prompt hardening and prompt-injection testing - RAG evaluation test sets - Vendor security questionnaire completion - Expert-reviewed AI agent and MCP security assessments You get clear, prioritized findings so you know what to fix first and why. All work is AI-assisted, expert-reviewed delivery.... Read more

Skills

a
alexanderzack
Alexander Hearn
Offline • 

See my services

AI Technology Consulting
I will harden your ai chatbot system prompt against prompt injection
From$50 / projectMore details
Data Governance & Protection
I will build your cmmc level 1 self assessment evidence package
From$400 / projectMore details

Work experience

Handshake

Cybersecurity Specialist 1

Handshake

Jun 2026 - Present • 4 mos

Contract W-2 (via TCWGlobal) as a Cybersecurity Specialist 1 on Handshake's AI red team. I red-team LLM systems: probing for prompt-injection and jailbreak weaknesses, documenting findings, and helping product teams understand what to fix first.