Nataliia Vesnina

Key Skills

Software

Mercor

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Freelancer Overview

I am a detail-oriented data annotation specialist with a background in linguistics and extensive experience working on AI training data projects involving text, audio, and video. My expertise includes semantic annotation, transcription, prompt writing, and reviewing AI-generated outputs for clarity and accuracy. I have worked with complex annotation schemes in both research and commercial environments, ensuring high-quality, consistent labeling across large datasets. Skilled in quality assurance, guideline-based evaluation, and error detection, I excel at maintaining precision and reliability under tight deadlines. My multilingual abilities and experience collaborating with international teams allow me to adapt quickly to new domains and project requirements, whether working independently or as part of a distributed team.

Labeling Experience

AI Data Annotation & Model Evaluation Contractor

MercorTextEvaluation Rating

As an AI Data Annotation & Model Evaluation Contractor, I annotated and evaluated AI-generated outputs for text, speech, and video. I performed comparison and ranking of LLM responses following project rubrics, and rewrote outputs to align with policy requirements. I generated quality prompts and ensured consistency using structured frameworks. • Annotated outputs in text, speech, and video modalities • Conducted pairwise LLM response comparison and ranking • Generated and optimized prompts for LLMs • Documented rationale for auditability and QA.

As an AI Data Annotation & Model Evaluation Contractor, I annotated and evaluated AI-generated outputs for text, speech, and video. I performed comparison and ranking of LLM responses following project rubrics, and rewrote outputs to align with policy requirements. I generated quality prompts and ensured consistency using structured frameworks. • Annotated outputs in text, speech, and video modalities • Conducted pairwise LLM response comparison and ranking • Generated and optimized prompts for LLMs • Documented rationale for auditability and QA.

2025

Linguistic Data Annotation (PhD Research)

TextClassification

As a linguistic data annotator in PhD research, I conducted large-scale semantic annotation of text and spoken corpora. I manually transcribed, segmented, and labeled speech data, and annotated multimodal video using formal schemes. I created guidelines and systematically validated datasets for consistency. • Performed semantic annotation of text and speech • Transcribed and segmented audio data • Annotated video gestures and interaction markers • Developed annotation guidelines and performed QA.

As a linguistic data annotator in PhD research, I conducted large-scale semantic annotation of text and spoken corpora. I manually transcribed, segmented, and labeled speech data, and annotated multimodal video using formal schemes. I created guidelines and systematically validated datasets for consistency. • Performed semantic annotation of text and speech • Transcribed and segmented audio data • Annotated video gestures and interaction markers • Developed annotation guidelines and performed QA.

2019 - 2023

Education

Work History