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Marckell Jerry C.

Marckell Jerry C.

Cybersecurity Analyst & Technical SME | Identity & Access Management (IAM) | Cisco & ISC2 Certified

Philippines flagAguilar, Philippines

Key Skills

Software

MindriftMindrift
OneFormaOneForma
TolokaToloka
TelusTelus
Internal/Proprietary Tooling

Top Subject Matter

Information Technology & Services
Computer & Network Security
Artificial Intelligence (Red Teaming & LLM Training)

Top Data Types

TextText
DocumentDocument

Top Task Types

Data CollectionData Collection
Red TeamingRed Teaming
TranscriptionTranscription
RLHFRLHF
Text SummarizationText Summarization
ClassificationClassification
Evaluation/RatingEvaluation/Rating
Question AnsweringQuestion Answering
Text GenerationText Generation

Freelancer Overview

Technical Subject Matter Expert (SME) specializing in Cybersecurity, Identity and Access Management (IAM), and Adversarial AI Testing. I bring a disciplined, analytical approach to AI training, with specific experience in Reinforcement Learning from Human Feedback (RLHF) and Red Teaming. My background in Cisco networking and ISC2 cybersecurity frameworks allows me to evaluate AI outputs for technical accuracy, security compliance, and logical consistency. ​I have extensive experience in Adversarial Prompt Engineering, where I manually stress-test Large Language Models (LLMs) to identify hallucinations, security vulnerabilities, and logic gaps. Whether auditing smart-contract explanations or verifying system administration guides, I focus on ensuring that AI-generated data is safe, accurate, and production-ready.

Labeling Experience

Adversarial AI Tester & Prompt Engineer

TextTextRed TeamingRed Teaming

Conducted adversarial stress-testing (Red Teaming) for decentralized AI protocols. My work focused on 'jailbreaking' and boundary testing LLMs to identify security vulnerabilities, logical fallacies, and hallucination triggers. I drafted complex, multi-step prompts to evaluate the model's safety guardrails and response consistency, providing detailed feedback to developers on model limitations and failure points

2024 - 2025

Education

A

Aguilar Integrated School

K-12 Technical-Vocational-Livelihood Track Certificate, Computer Systems Servicing

K-12 Technical-Vocational-Livelihood Track Certificate
2012 - 2024

Work History

N

N/A

Cybersecurity Analyst & IAM Professional

Aguilar
2026 - Present
P

Personal Technical Research Lab / Self-employed

Security Systems Architect & Researcher (Self-Initiated)

Aguilar
2024 - Present