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C

Cephas Karanja N.

Video Annotation Specialist & Labeling Assistant at Atlas Capture

Kenya flagNairobi, Kenya

Key Skills

Software

AppenAppen
ClickworkerClickworker
CrowdFlowerCrowdFlower
LabelboxLabelbox
MercorMercor
MindriftMindrift

Top Subject Matter

Video action recognition dataset labeling and temporal segmentation QA.
Legal Services & Contract Review
Regulatory Compliance & Risk Analysis

Top Data Types

VideoVideo
ImageImage
DocumentDocument

Top Task Types

Action RecognitionAction Recognition
ClassificationClassification
SegmentationSegmentation

Freelancer Overview

Video Annotation Specialist & Labeling Assistant at Atlas Capture. Brings 2+ years of professional experience across complex professional workflows, research, and quality-focused execution. Core strengths include Atlas Capture platform. Education includes Enrolled Program, Unicaf University (2025). AI-training focus includes data types such as Video and labeling workflows including Action Recognition.

Labeling Experience

Video Annotation Specialist & Labeling Assistant at Atlas Capture

VideoVideoAction RecognitionAction Recognition

Served as a Video Annotation Specialist and Labeling Assistant, producing high-granularity temporal labels for AI model training. Defined extremely precise action recognition temporal boundaries using highly granular timestamp increments down to 00.4 and 00.5 seconds. Enforced dense labeling protocols with strict segment duration and action-count constraints to preserve dataset consistency and model learnability. • Established and maintained temporal segmentation standards for action recognition tasks. • Applied dense labeling rules, including max 20-second segments and max two distinct actions per segment. • Performed QA and corrected model omissions by identifying skipped micro-actions. • Acted as a workflow subject matter expert, supporting improved evaluation standards.

2026 - Present

Education

U

Unicaf University

Enrolled Program, General Studies

Enrolled Program
2025

Work History

S

Superprof

Freelance Content and Education Specialist

Nairobi
2025 - Present
W

WritersThrive

Freelance Content Specialist

Nairobi
2025 - Present