Timileyin O.

Key Skills

Software

Labelbox

CVAT

Scale AI

Other

Top Subject Matter

Nlp Domain Expertise

Rlhf Domain Expertise

sentiment analysis

Top Data Types

Text

Audio

Image

Top Task Types

Transcription

Object Detection

Freelancer Overview

Senior Data Annotation Specialist, AtlasCapture. Core strengths include Labelbox, CVAT, and Scale AI. Education includes Bachelor of Science, National Open University of Nigeria (NOUN) (2024). AI-training focus includes data types such as Text, Audio, and Image and labeling workflows including Entity (NER), Transcription, and Translation.

Labeling Experience

Senior Data Annotation Specialist, AtlasCapture

LabelboxText

Led large-scale NLP dataset annotation for AI language model training across sentiment analysis, intent detection, named entity recognition, and semantic similarity tasks while maintaining 99%+ quality scores. Performed RLHF annotation by evaluating, ranking, and providing structured feedback on AI-generated responses to improve LLM performance and output quality. Ensured compliance with complex annotation guidelines and collaborated with stakeholders to refine guidelines for consistency. • Sentiment, intent, and semantic similarity labeling • Named entity recognition and linguistic annotation • RLHF response ranking and feedback • Quality assurance via guideline compliance and validation

2023 - Present

Data Annotation Analyst, Datalens Africa

LabelboxAudioTranscription

Annotated text, audio, and video datasets for machine learning clients across healthcare, fintech, and e-commerce domains. Processed audio recordings for ASR model training by transcribing, segmenting, and tagging spoken content across Nigerian English and Pidgin dialects. Maintained an accuracy rate of 98.5% while meeting client quality thresholds. • Speech-to-text transcription and segmentation • Medical entity labeling and product categorization • Quality maintenance and threshold adherence • Dataset management and export support (JSON/CSV/XML)

2021 - 2022

Linguistic Data Annotator, SigmaGroup Nigeria

Text

Delivered linguistic annotation services for AI training datasets focused on Yoruba and Nigerian English NLP tasks. Evaluated and rated AI-generated text outputs for accuracy, fluency, relevance, and safety, providing structured human feedback to fine-tune large language models. Annotated conversational datasets for chatbot and virtual assistant training by labeling intents, dialogue acts, slot values, and entity mentions. • Text classification and sentiment labeling • Machine translation evaluation and dialogue annotation • Human rating and structured feedback for LLM improvement • Annotation logs and quality reporting for audit traceability

2020 - 2021

AI Data Annotation Contributor, Hugo—AIOperations

OtherImageObject Detection

Contributed to large-scale AI data annotation projects across text, image, and structured data formats to support international technology clients. Labeled and categorized social media content and news/user-generated text for content moderation, topic classification, and misinformation detection model training. Performed image annotation tasks including object detection bounding boxes, scene classification, and visual moderation labeling. • Content moderation and topic/misinformation labeling • Image object detection with bounding boxes • Scene classification and visual moderation • Strict guideline following under NDA and confidentiality protocols

2019 - 2020

Education

Work History