Charles O.

Key Skills

Software

Appen

Mercor

Top Subject Matter

Information Technology Expert

Social media content safety

E-Commerce- Product Categorization

Top Data Types

Text

Document

Top Task Types

Bounding Box

Polygon

Segmentation

Classification

Text Generation

RLHF

Fine-tuning

Red Teaming

Transcription

Evaluation/Rating

Computer Programming/Coding

Prompt + Response Writing (SFT)

Function Calling

Data Collection

Text Summarization

Question Answering

Freelancer Overview

AI Trainer/IT Domain Expert (Remote) - Evauates model responses for grounding, hallucination and overall response quality. Brings 3+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Appen and Mercor. Education includes Master of Science, Cyprus International University (2024) and Bachelor of Science, University of Port Harcourt. AI-training focus includes data types such as Text and labeling workflows including Evaluation and Rating.

Labeling Experience

AI Evaluator / IT Domain Expert (Remote)

MercorText

Served as an AI Evaluator and IT Domain expert evaluating AI system outputs for grounding, hallucinations, and user intent alignment. Designed and executed multi-turn prompt assessments to test contextual reasoning and personalization across domains. Conducted high-volume side-by-side evaluations to improve ranking consistency and response quality while enforcing strict data hygiene compliance. • Built multi-turn prompt tests for contextual reasoning and personalization • Rated model outputs for grounding, hallucination risk, and intent alignment • Performed side-by-side (SxS) evaluation for ranking consistency • Maintained data hygiene compliance to prevent dataset contamination

2026 - Present

Social Media Evaluator (Remote)

AppenText

Worked as a Social Media Evaluator performing content review for information quality and policy compliance across multiple media types. Assessed factual claim credibility using authoritative sources and identified spam, hate speech, and manipulated media. Escalated sensitive or ambiguous cases while maintaining consistent evaluation standards at high throughput. • Evaluated social media posts, comments, images, and videos for policy adherence • Performed credibility checks and misinformation detection via source grounding • Flagged spam, hate speech, and manipulated media indicators • Followed evaluation guidelines and escalation processes for edge cases

2026 - Present

Education

Work History