Ransom Onyemekara

Key Skills

Software

Mercor

Other

OneForma

Top Subject Matter

LLM and computer vision AI training

Conversational AI

Machine learning model training (video)

Top Data Types

Image

Text

Video

Document

Top Task Types

Classification

Segmentation

Freelancer Overview

Detail-oriented AI Data Specialist with hands-on experience across data annotation, prompt evaluation, and content quality assurance for machine learning systems. Proven ability to interpret complex guidelines, evaluate AI-generated outputs, and ensure high-quality labeled datasets across text, image, and multimodal tasks. Strong analytical mindset with a track record of maintaining accuracy and consistency in fast-paced, remote AI training environments

Labeling Experience

Data Annotator & Generalist Contributor

MercorImageClassification

As a Data Annotator & Generalist Contributor at Mercor, I completed high-volume annotation tasks across text and image datasets. I evaluated AI-generated responses for accuracy, coherence, and instruction adherence. I consistently applied rubrics and flagged unsafe or low-quality content while supporting LLM and computer vision training systems. • Performed annotation and quality evaluation using detailed guidelines. • Improved model performance via output ranking. • Maintained top quality scores and efficiency under tight deadlines. • Ensured flagged content adhered to policy and safety standards.

As a Data Annotator & Generalist Contributor at Mercor, I completed high-volume annotation tasks across text and image datasets. I evaluated AI-generated responses for accuracy, coherence, and instruction adherence. I consistently applied rubrics and flagged unsafe or low-quality content while supporting LLM and computer vision training systems. • Performed annotation and quality evaluation using detailed guidelines. • Improved model performance via output ranking. • Maintained top quality scores and efficiency under tight deadlines. • Ensured flagged content adhered to policy and safety standards.

2025 - Present

Prompt Reviewer

OtherText

As a Prompt Reviewer at Meridial Marketplace, I assessed AI-generated content for factual correctness, tone, and relevance in conversational AI. I performed prompt-response evaluations and suggested improvements to optimize model outputs. I conducted comparative analysis and ensured compliance with safety, bias, and formatting guidelines. • Improved dataset reliability for conversational AI training systems. • Suggested effective enhancements for prompt-response quality. • Conducted analyses between multiple model responses. • Maintained adherence to safety standards and bias policies.

As a Prompt Reviewer at Meridial Marketplace, I assessed AI-generated content for factual correctness, tone, and relevance in conversational AI. I performed prompt-response evaluations and suggested improvements to optimize model outputs. I conducted comparative analysis and ensured compliance with safety, bias, and formatting guidelines. • Improved dataset reliability for conversational AI training systems. • Suggested effective enhancements for prompt-response quality. • Conducted analyses between multiple model responses. • Maintained adherence to safety standards and bias policies.

2025 - 2026

Video Data Annotator

OtherVideoSegmentation

As a Video Data Annotator at Atlas Capture, I labeled and segmented video data to support machine learning model training. I identified and tagged actions, objects, and events within sequences and ensured consistency across annotated segments. I followed guidelines for temporal labeling and sequence classification, reviewing all work for accuracy. • Provided detailed segmentation and tagging for video datasets. • Enhanced ML model accuracy through precise annotation. • Followed robust quality control and error correction processes. • Collaborated remotely for project alignment and effectiveness.

As a Video Data Annotator at Atlas Capture, I labeled and segmented video data to support machine learning model training. I identified and tagged actions, objects, and events within sequences and ensured consistency across annotated segments. I followed guidelines for temporal labeling and sequence classification, reviewing all work for accuracy. • Provided detailed segmentation and tagging for video datasets. • Enhanced ML model accuracy through precise annotation. • Followed robust quality control and error correction processes. • Collaborated remotely for project alignment and effectiveness.

2025 - 2025

Data Annotation & Research Contributor

OneformaTextClassification

At OneForma, I worked as a Data Annotation & Research Contributor and annotated text datasets for NLP model training. I performed classification and sentiment analysis tasks, conducted fact-checking, and validated sources for quality assurance. My work included correcting labeling errors and improving dataset quality under varying project guidelines. • Delivered consistent annotation for complex NLP projects. • Conducted research-based labeling and data validation. • Improved textual dataset reliability through error correction. • Adapted to multiple, short-term annotation projects efficiently.

At OneForma, I worked as a Data Annotation & Research Contributor and annotated text datasets for NLP model training. I performed classification and sentiment analysis tasks, conducted fact-checking, and validated sources for quality assurance. My work included correcting labeling errors and improving dataset quality under varying project guidelines. • Delivered consistent annotation for complex NLP projects. • Conducted research-based labeling and data validation. • Improved textual dataset reliability through error correction. • Adapted to multiple, short-term annotation projects efficiently.

2024 - 2024

Education

Work History