Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I am a meticulous and tech-savvy data annotator with a B.Tech in Information Technology and five years of freelance experience in high-volume data labeling for ML/AI models. I have consistently achieved 98%+ accuracy across computer vision and NLP projects, and I am proficient with industry-standard annotation tools to handle datasets including LiDAR, semantic segmentation, and entity recognition. I am a reliable self-starter who thrives under tight deadlines and prioritizes data privacy. I collaborate well with cross-functional teams, welcome feedback on edge cases, and continuously refine annotation workflows to deliver high-quality ground-truth data.…I am a meticulous and tech-savvy data annotator with a B.Tech in Information Technology and five years of freelance experience in high-volume data labeling for ML/AI models. I have consistently achieved 98%+ accuracy across computer vision and NLP projects, and I am proficient with industry-standard annotation tools to handle datasets including LiDAR, semantic segmentation, and entity recognition. I am a reliable self-starter who thrives under tight deadlines and prioritizes data privacy. I collaborate well with cross-functional teams, welcome feedback on edge cases, and continuously refine annotation workflows to deliver high-quality ground-truth data.

Jefferson Masero

3D Designer, 3D Animator, Animation Director, +7





I am a meticulous and tech-savvy data annotator with a B.Tech in Information Technology and five years of freelance experience in high-volume data labeling for ML/AI models. I have consistently achieved 98%+ accuracy across computer vision and NLP projects, and I am proficient with industry-standard annotation tools to handle datasets including LiDAR, semantic segmentation, and entity recognition. I am a reliable self-starter who thrives under tight deadlines and prioritizes data privacy. I collaborate well with cross-functional teams, welcome feedback on edge cases, and continuously refine annotation workflows to deliver high-quality ground-truth data.…I am a meticulous and tech-savvy data annotator with a B.Tech in Information Technology and five years of freelance experience in high-volume data labeling for ML/AI models. I have consistently achieved 98%+ accuracy across computer vision and NLP projects, and I am proficient with industry-standard annotation tools to handle datasets including LiDAR, semantic segmentation, and entity recognition. I am a reliable self-starter who thrives under tight deadlines and prioritizes data privacy. I collaborate well with cross-functional teams, welcome feedback on edge cases, and continuously refine annotation workflows to deliver high-quality ground-truth data.

Available to hire

I am a meticulous and tech-savvy data annotator with a B.Tech in Information Technology and five years of freelance experience in high-volume data labeling for ML/AI models. I have consistently achieved 98%+ accuracy across computer vision and NLP projects, and I am proficient with industry-standard annotation tools to handle datasets including LiDAR, semantic segmentation, and entity recognition.

I am a reliable self-starter who thrives under tight deadlines and prioritizes data privacy. I collaborate well with cross-functional teams, welcome feedback on edge cases, and continuously refine annotation workflows to deliver high-quality ground-truth data.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Swahili

Fluent

Work Experience

Software engineer at Havannna

March 2, 2026 - Present

Lead Online English Instructor at Global Virtual Academy

August 1, 2018 - Present

Designs and teaches comprehensive online writing and communication courses for diverse, international cohorts; maintains a 95% student retention and satisfaction rate. Develops dynamic, interactive digital course materials, including syllabi, weekly lesson plans, multimedia handouts, and automated homework within Canva LMS. Facilitates vibrant, inclusive virtual classroom discussions and has recently designed curriculum modules exploring complex global narratives, including cultural imperialism and its representation in media. Provides timely, individualized feedback on 150+ assignments weekly and maintains meticulous records of attendance and academic progress to ensure compliance with institutional standards.

Lecturer, English and Communications at Nairobi Institute of Communications

January 1, 2012 - July 1, 2018

Instructed undergraduate English composition, literature, and effective verbal communication, transitioning traditional coursework to hybrid learning models. Created a supportive, inclusive classroom environment tailored to varied learning styles, contributing to a 20% improvement in overall student performance over four years. Leveraged educational technology and online assessment tools to streamline grading and provide faster, more actionable feedback. Mentored students individually, identifying writing roadblocks and offering targeted interventions to ensure academic success and continuous professional growth.

Lead Freelance Data Annotator at Mercor

January 1, 2025 - January 1, 2026

Led high-precision annotation for autonomous driving datasets, delivering pixel-perfect semantic segmentation and labeling of road features, pedestrians, and vehicles with 99% accuracy. Audited and mentored junior annotators as QA reviewer, providing guidance on edge cases and ensuring compliance with complex client guidelines. Performed 3D LiDAR point cloud annotation, manipulating 3D views to accurately tag objects in spatial environments. Consistently exceeded weekly throughput targets by 20% while maintaining a rejection rate below 2%.

Data Annotator at Remotasks

January 1, 2019 - December 1, 2024

Processed over 5,000 images weekly using 2D bounding boxes and polygons to train object-detection models for retail and security AI. Categorized and tagged large NLP datasets for sentiment analysis to improve customer service chatbots. Transcribed and annotated audio files with timestamps for speech-to-text algorithm training. Adhered to evolving guidelines with zero workflow interruptions.