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John Wennergren

John Wennergren

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Freelancer Overview

I am an experienced AI data annotator and freelancer specializing in high-accuracy labeling and quality review for machine learning projects. My work spans text, image, audio, and video data, with a strong track record of handling sensitive and policy-restricted content while maintaining zero quality flags. I consistently deliver precise annotations by adhering to strict guidelines and escalating edge cases appropriately, resulting in reduced reviewer corrections and repeat contract invitations. My skills include data validation, transcription, online research, academic referencing (APA, MLA, Harvard), and proficiency with Microsoft Word, Excel, Google Docs, and Sheets. I am committed to supporting production-level AI models with reliable, well-annotated datasets and have successfully contributed to projects for U.S.-based AI research institutions, university-affiliated labs, and academic clients.

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