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Julius Nganga

Julius Nganga

AI Data Annotator - Technology & Internet

Kenya flagNairobi, Kenya
$20.00/hrExpertAppenClickworkerOneforma

Key Skills

Software

AppenAppen
ClickworkerClickworker
OneFormaOneForma
RemotasksRemotasks
SamaSama
TolokaToloka
Scale AIScale AI

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
ImageImage
VideoVideo

Top Task Types

Bounding Box
Classification
Evaluation Rating
Object Detection
Segmentation

Freelancer Overview

I am an experienced AI data annotator and quality assurance specialist with a strong background in creating high-quality training data for diverse domains, including autonomous vehicles, blockchain analysis, large language models, and semantic labeling. My work spans projects with organizations like Sama AI, OneForma, Crowdgen, and OpenTrain AI, where I have honed my skills in data labeling, LiDAR annotation, search evaluation, and QA. I am adept at handling ambiguous guidelines and imperfect data, ensuring accuracy and consistency through meticulous attention to detail. My technical expertise includes Python, web scraping, version control with Git, and data entry, complemented by an understanding of the end-to-end AI lifecycle. I am passionate about transforming raw data into actionable insights and continuously learning new tools and methods to improve data quality and model outcomes.

ExpertFrenchBengaliEnglishRussianSpanish

Labeling Experience

OneForma

Large Language Model (LLM) Trainer/Rater

OneformaTextText GenerationText Summarization
Trained and fine-tuned Large Language Models (LLMs) by rating, generating, and reviewing text-based data to improve model coherence, relevance, and safety.

Trained and fine-tuned Large Language Models (LLMs) by rating, generating, and reviewing text-based data to improve model coherence, relevance, and safety.

2022 - 2025
Appen

Semantic Data Labeler

AppenTextEntity Ner ClassificationSegmentation
Performed detailed semantic annotation on various data types, ensuring accurate labeling of content elements to enhance machine learning model understanding and performance.

Performed detailed semantic annotation on various data types, ensuring accurate labeling of content elements to enhance machine learning model understanding and performance.

2021 - 2025
Sama

Autonomous Vehicle Perception Annotator

Sama3D SensorBounding BoxPolygon
Precisely labeled and segmented image and sensor data (e.g., LiDAR, camera) for training Machine Learning models critical for autonomous driving systems.

Precisely labeled and segmented image and sensor data (e.g., LiDAR, camera) for training Machine Learning models critical for autonomous driving systems.

2023 - 2024
Toloka

Search Quality and Relevance Evaluator

TolokaTextEvaluation Rating
Assessed the relevance, accuracy, and quality of search engine results, providing crucial feedback to optimize search algorithms and improve user experience.

Assessed the relevance, accuracy, and quality of search engine results, providing crucial feedback to optimize search algorithms and improve user experience.

2020 - 2024
Clickworker

Multi-Modal General Data Annotator

ClickworkerVideoBounding BoxClassification
Conducted diverse data annotation tasks, including bounding box creation, text categorization, and image tagging, to support the development of AI/ML applications.

Conducted diverse data annotation tasks, including bounding box creation, text categorization, and image tagging, to support the development of AI/ML applications.

2019 - 2023

Education

A

Alison

Advanced Diploma, Full-Stack Web Development with Python and React

Advanced Diploma
2024 - 2025
U

University of Nairobi

Master of Science, Mechanical Engineering

Master of Science
2020 - 2022

Work History

U

Upwork

Virtual Assistant and Full-Stack Web Developer

Nairobi
2023 - Present
T

Trust Army

Blockchain Data Analyst

Nairobi
2023 - 2025