Virginia Sebilimetsa
@virginiasebilimetsa
I improve AI models through precise data annotation, evaluation, and quality assurance.
South AfricaWhat I'm looking for
I'm a freelance Data Annotator and QA Expert at Data Annotation.tech, where I annotate text, images, video, and audio while evaluating AI outputs for quality, factual correctness, consistency, hallucinations, and clarity.
I complete RLHF tasks that rate, rank, and improve model responses, write clear review justifications, and assess completed datasets against detailed project guidelines.
Previously, I delivered content writing, evaluation, research, fact-checking, editing, and transcription projects through Upwork, maintaining a 95% Job Success Score. I also teach English with EF Education First, evaluating spoken and written work and documenting learner progress accurately.
With a Public Management degree and TEFL certification, I bring structured analysis, language expertise, and a consistent focus on accurate, high-quality AI training data.
Experience
Work history, roles, and key accomplishments
Freelance Data Annotator | QA Expert
Data Annotation.tech
Dec 2023 - Present (2 years 9 months)
Completed text, image, video, and audio annotation tasks following project guidelines. Performed RLHF tasks to rate, rank, and improve AI model outputs, and maintained high accuracy across quality assurance queues.
Delivered structured lessons while evaluating spoken and written assignments. Corrected written submissions for clarity, grammar, and structural accuracy, and documented client progress and session results.
Delivered written content, articles, and transcription tasks across diverse projects, maintaining a 95% Job Success Score. Edited and evaluated written materials for clarity, accuracy, tone, and structural quality.
Education
Degrees, certifications, and relevant coursework
TEFL Foundation
TEFL Certification, Teaching English as a Foreign Language
2020 - 2020
Completed a 120-hour TEFL certification in 2020.
University of Pretoria
Bachelor of Administration, Public Management
2017 - 2019
Bachelor of Administration in Public Management from the University of Pretoria, completed from 2017 to 2019.
Tech stack
Software and tools used professionally
Availability
Location
South AfricaAuthorized to work in
Job categories
Skills
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