Johnson Donyina
@johnsondonyina
Data labelling specialist skilled in AI training and medical-science informed annotation.
GhanaWhat I'm looking for
I am a detail-oriented data labelling specialist with experience annotating datasets for AI, particularly in healthcare contexts. I have worked as a freelancer and for annotation vendors, consistently delivering accurate, high-quality labels.
My background includes roles at AyaDatagh, DiagnosUs/Centaur Lab, Premise and other platforms where I focused on data annotation, CVAT proficiency, and quality control. I combine technical/tool knowledge with strong writing and drawing skills to improve dataset consistency.
I hold a BSc in Medical Sciences from the University of Ghana, Medical School, and training certification as an Aya Data Labelling Specialist. I apply domain knowledge from medical studies to support healthcare AI training tasks.
I work well independently or in teams, value meticulousness and clear communication, and seek roles where I can contribute to reliable AI datasets and continuous process improvement.
Experience
Work history, roles, and key accomplishments
Data Labelling Specialist
AyaDatagh
Apr 2025 - Present (6 months)
Perform data labeling for AI/ML datasets, ensuring high annotation quality and consistency; completed Aya Data Labelling Specialist training in 2025 and contributed to improved dataset accuracy.
Data Annotation Specialist
DiagnosUs; Centaur Lab
Jan 2024 - Present (1 year 9 months)
Annotated and labeled medical datasets to support diagnostic AI models, maintaining labeling standards and contributing to dataset readiness for model training since 2024.
Freelance Data Annotator
Clickerworker
Jan 2019 - Present (6 years 9 months)
Provided freelance data annotation and microtasking services across multiple projects since 2019, delivering accurate labels under tight deadlines.
Freelance Data Worker
Tolaka
Jan 2019 - Present (6 years 9 months)
Executed freelance tasks including data labeling and annotation for platform-based projects since 2019, maintaining high accuracy and throughput.
Freelance Contributor
Premise
Jan 2020 - Dec 2023 (3 years 11 months)
Completed freelance data collection and verification tasks for Premise from 2020 to 2023, contributing verified inputs for analysis and model training.
Internet Café Typist
Higher Soarers Consult
Jan 2019 - Dec 2020 (1 year 11 months)
Operated internet café and printing press services, performed typist duties and customer support from 2019 to 2020, improving service turnaround and client satisfaction.
Education
Degrees, certifications, and relevant coursework
USUniversity of Ghana Medical School
Bachelor of Science, Medical Sciences
2021 - 2023
BSc Medical Sciences studies at the University of Ghana Medical School from 2021 to August 2023.
Nkoranza Senior High/Technical School
WASSCE, General Secondary Education
2016 - 2019
Completed WASSCE at Nkoranza Senior High/Technical School from September 2016 to June 2019.
Nkoranza Effah Presby Junior High School
BECE, Basic Education
2013 - 2016
Completed BECE at Nkoranza Effah Presby Junior High School from September 2013 to July 2016.
Nkoranza Effah Presby Primary School
Primary Leaving Certificate, Primary Education
2009 - 2013
Primary education at Nkoranza Effah Presby Primary School from September 2009 to September 2013.
Tech stack
Software and tools used professionally
Availability
Location
GhanaAuthorized to work in
Job categories
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