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Oluwafemi Ogunleye

@phemtech

Full-stack developer and AI data specialist building scalable web apps.

Nigeria
Message

What I'm looking for

I’m looking for a role where I can build clean, scalable web applications and contribute to high-quality AI datasets. I want a team that values performance, data accuracy, and continuous improvement.

I’m a detail-oriented Full-Stack Developer and Data Annotator with strong experience building scalable web applications and preparing high-quality datasets for AI and machine learning models.

I design and develop responsive, production-ready applications using React.js, Node.js, and MongoDB, and I build RESTful APIs for frontend functionality and third-party integrations. In my current role, I optimize backend performance and reduced API response time by 30%, while leading reusable UI component libraries using Agile development practices.

On the AI data side, I annotate large datasets for computer vision and NLP, creating bounding boxes, segmentation masks, and key point annotations. I also label text for sentiment analysis, named entity recognition (NER), and classification, performing quality control and validation to keep annotation accuracy high.

I’ve also worked on audio datasets for speech-to-text and conversational AI, including speaker identity tagging, timestamps, and audio event labeling. I align audio and text for multimodal evaluation and use thorough QA processes to improve dataset quality and training outcomes.

Experience

Work history, roles, and key accomplishments

FR
Current

Data Annotator / AI Data Specialist

Freelancer

Jun 2025 - Present (11 months)

Annotated large computer-vision and NLP datasets by creating bounding boxes, segmentation masks, and key point labels, and labeling text for sentiment analysis and entity recognition. Performed quality control and validation and collaborated with machine learning engineers to refine labeling guidelines using Label Studio.

Education

Degrees, certifications, and relevant coursework

HS

Harvarde College of Science, Business and Management Studies

Higher National Diploma (HND), Computer Science

Earned a Higher National Diploma (HND) in Computer Science from Harvarde College.

NT

National Institute of Information Technology

Certificate in Software Engineering, Software Engineering

Completed a certificate in Software Engineering from the National Institute of Information Technology.

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