Lesley Ochola

Detail-oriented AI Data Annotator with over 8 years of experience delivering high-quality labeled datasets for machine learning and artificial intelligence systems. Proven expertise in image, text, audio, and video annotation, with a strong understanding of data quality assurance, model training requirements, and annotation tools. Known for maintaining high accuracy rates, meeting tight deadlines, and collaborating effectively with cross-functional teams.

Senior AI Data Annotator - iMerit Technology Services

(2021-01)

• Led annotation projects involving 500K+ data points across NLP and computer vision pipelines
• Reviewed and validated annotated data to maintain 98–99% accuracy benchmarks
• Mentored 10+ junior annotators, improving team output quality by ~20%
• Collaborated with ML engineers to refine annotation guidelines, reducing ambiguity-related errors by 15%
• Managed high-volume annotation workflows, consistently meeting 100% of deadlines

AI Data Annotator - Samasource (Sama)

(2018-01 - 2021-12)

• Annotated 300K+ images and video frames for autonomous vehicle object detection and segmentation models
• Completed 50K+ text annotation tasks (classification, sentiment analysis, NER)
• Maintained consistency across datasets with <2% error rate through strict guideline adherence
• Flagged and resolved 1,000+ ambiguous data cases, improving dataset clarity and usability

Data Annotation Specialist - CloudFactory

(2016-01 - 2018-12)

• Processed and labeled 200K+ image and audio data samples for AI training datasets
• Delivered transcription for 1,500+ hours of audio with high accuracy
• Supported QA processes, reducing annotation errors by ~18%
• Proposed workflow improvements that increased annotation speed by 15%

Junior Data Annotator - Freelance / Remote Projects

(2015-01 - 2016-12)

• Completed 50K+ annotation tasks including tagging, categorization, and basic labeling
• Achieved consistent accuracy rates above 95% across multiple small-scale projects
• Gained hands-on experience with early-stage annotation tools and data pipelines

Bachelor's Degree - Information Technology - University of Nairobi (2011-01 - 2015-12)