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Stephen Njoroge

AI Data Annotator | Video, Image & Text Labeling Specialist

Kenya flagNairobi, Kenya
$12.00/hrExpertAppenClickworkerOneforma

Key Skills

Software

AppenAppen
ClickworkerClickworker
OneFormaOneForma
MindriftMindrift
Micro1
LionbridgeLionbridge
LabelImgLabelImg
RemotasksRemotasks
Scale AIScale AI
TolokaToloka
TelusTelus

Top Subject Matter

Computer Vision & Autonomous Systems
Natural Language Processing (NLP)
AI Training Data & Machine Learning

Top Data Types

TextText
ImageImage
VideoVideo

Top Task Types

Bounding Box
Segmentation
Point Key Point
Cuboid
Question Answering
Text Summarization
Fine Tuning
Transcription
Data Collection
Prompt Response Writing SFT

Freelancer Overview

Farm Manager in Contract Review, Compliance, and Legal Research. Brings 3+ years of professional experience across complex professional workflows, research, and quality-focused execution. Education includes Certificate, Kenya School of Agriculture (2025) and Bachelor of Science, University of Nairobi (2023).

ExpertSwahiliFrenchEnglish

Labeling Experience

Multimodal AI Training Dataset Annotation

ImageClassification
Contributed to a multimodal AI training dataset involving both image and text data labeling. Responsibilities included annotating images with bounding boxes and classification labels, categorizing textual data into predefined semantic groups, and tagging metadata to improve dataset structure for machine learning applications.

Contributed to a multimodal AI training dataset involving both image and text data labeling. Responsibilities included annotating images with bounding boxes and classification labels, categorizing textual data into predefined semantic groups, and tagging metadata to improve dataset structure for machine learning applications.

2026 - Present

Project Atlas

VideoBounding Box
Worked as a video data annotator on a large-scale computer vision training dataset involving thousands of short video clips. The task focused on frame-by-frame object detection and consistent object tracking across sequences. I annotated moving entities using bounding boxes, maintained object IDs across frames, and labeled human actions and environmental interactions. Additional tasks included event time stamping and contextual frame tagging to help train AI models for behavior recognition and scene understanding.

Worked as a video data annotator on a large-scale computer vision training dataset involving thousands of short video clips. The task focused on frame-by-frame object detection and consistent object tracking across sequences. I annotated moving entities using bounding boxes, maintained object IDs across frames, and labeled human actions and environmental interactions. Additional tasks included event time stamping and contextual frame tagging to help train AI models for behavior recognition and scene understanding.

2024 - 2025

Advanced Video Annotation and Object Tracking for AI Training

VideoBounding Box
Worked as a video data annotator on large-scale computer vision datasets through projects delivered on the Outlier AI platform. The work involved frame-by-frame video annotation, including drawing accurate bounding boxes around objects and maintaining object IDs across frames to ensure consistent tracking. I labeled human activities, environmental objects, and interaction events within short video clips used to train AI perception systems.

Worked as a video data annotator on large-scale computer vision datasets through projects delivered on the Outlier AI platform. The work involved frame-by-frame video annotation, including drawing accurate bounding boxes around objects and maintaining object IDs across frames to ensure consistent tracking. I labeled human activities, environmental objects, and interaction events within short video clips used to train AI perception systems.

2023 - 2025

Education

K

Kenya School of Agriculture

Certificate, Horticulture

Certificate
2025 - 2025
U

University of Nairobi

Bachelor of Science, Microbiology and Biotechnology

Bachelor of Science
2019 - 2023

Work History

J

Jafason Farm

Farm Manager

Magogoni, Thika West
2025 - 2025
H

Hops Labour Solutions

Seasonal Farm Operative

N/A
2024 - 2024