For employers

Hire this AI Trainer

Sign in or create an account to invite AI Trainers to your job.

Invite to Job
Celestine Ogbajie

Celestine Ogbajie

AI Trainer and Backend Developer - Technology & Internet

NIGERIA flag
Abuja, Nigeria
$20.00/hrIntermediateOther

Key Skills

Software

Other

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio

Top Label Types

Evaluation Rating

Freelancer Overview

I am an experienced AI Trainer and backend developer with a strong background in data annotation, labeling, and model evaluation for machine learning projects. My expertise includes annotating large-scale text, audio, and map datasets, evaluating search engine relevance, and rating AI-generated speech outputs for fluency and quality. I am skilled in Python, SQL, Firebase, and RESTful APIs, and have hands-on experience with transcription validation, audio-text alignment, and providing structured feedback to refine AI training data. I am passionate about improving the performance of AI models, particularly in areas involving natural language processing and speech data, and thrive in collaborative, detail-oriented environments where quality training data is essential.

IntermediateEnglish

Labeling Experience

Data Annotator

OtherAudioEvaluation Rating
• Annotated and labeled large-scale text, audio, and map datasets to improve machine learning model accuracy. • Evaluated search engine outputs for relevance, intent alignment, and quality compliance. • Rated AI-generated speech outputs based on fluency, intelligibility, and linguistic standards. • Performed transcription validation and audio-text alignment verification. • Identified model inconsistencies and provided structured feedback to improve annotation guidelines. • Flagged edge cases and ambiguous data points to strengthen model training datasets.

• Annotated and labeled large-scale text, audio, and map datasets to improve machine learning model accuracy. • Evaluated search engine outputs for relevance, intent alignment, and quality compliance. • Rated AI-generated speech outputs based on fluency, intelligibility, and linguistic standards. • Performed transcription validation and audio-text alignment verification. • Identified model inconsistencies and provided structured feedback to improve annotation guidelines. • Flagged edge cases and ambiguous data points to strengthen model training datasets.

2025

Education

F

Federal University Dutsinma

Bachelor of Science, Mathematics

Bachelor of Science
2013 - 2017
K

Karrox Technologies

Certificate, Database Administration and Management

Certificate
2010 - 2010

Work History

F

Freelance

Backend Developer

Abuja
2023 - Present
W

Weytemi-D Nig. Ltd

Manager / Head of IT

Abuja
2018 - 2022