Rentus Mawira

Experienced Machine Learning and Data Annotation Specialist with 5+ years of hands-on work in preparing, labeling, and validating datasets for AI and automation projects. Skilled in computer vision, NLP, data quality assurance, and workflow optimization. Adept at collaborating with engineers, analysts, and cross-functional teams to improve model accuracy and streamline data processes. Seeking freelance opportunities in ML data preparation, annotation, and quality analysis.

Data Annotator at AfricaAI Labs (2019-02 – 2021-11)

• Labeled and categorized datasets for computer vision and NLP model training.
• Maintained a 99% accuracy rate through thorough reviews and corrections.
• Conducted quality checks to ensure compliance with project requirements.
• Collaborated with engineers to refine annotation guidelines and workflows.
• Trained new annotators on tools, standards, and quality best practices.
• Used platforms such as Labelbox, V7, and internal annotation tools.

Data Analyst Intern at Samasource (2021-12 – 2024-12)

• Assisted with data cleaning, validation, and analysis for QA projects.
• Helped design test cases and documented results for QA teams.
• Analyzed test outputs and suggested workflow improvements.
• Tracked project metrics to support efficient data processing.
• Contributed to automation testing and reporting tasks.

Bachelor of Science in Computer Science – University of Nairobi (2018)