Chiagozie N.

Key Skills

Software

Scale AI

Remotasks

Top Subject Matter

NLP datasets

RLHF preference ranking

LLM safety stress testing

Top Data Types

Text

Video

Document

Top Task Types

Entity (NER) Classification

Classification

Data Collection

Freelancer Overview

AI Data Annotator & Prompt Writer (Scale AI / Remotasks Platform). Brings 3+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Scale AI, Remotasks, and Toloka AI. Education includes Bachelor of Science, University of Lagos (2021). AI-training focus includes data types such as Text and labeling workflows including Entity (NER) Classification, Classification, and Evaluation.

Labeling Experience

AI Data Annotator & Prompt Writer (Scale AI / Remotasks Platform)

Scale AITextEntity (NER) Classification

Performed large-scale text annotation for NLP datasets, including sentiment, intent classification, and NER tagging. Contributed to RLHF feedback generation by writing and ranking model responses to support preference learning. Designed adversarial and edge-case prompts to detect hallucinations, policy violations, and factual errors. • Annotated sentiment, intent, and named-entity recognition labels for NLP tasks. • Provided RLHF preference feedback to feed directly into fine-tuning cycles. • Flagged problematic outputs with structured rationales for review and iteration. • Coordinated asynchronously with QA leads to clarify guidelines and reduce rework.

2023 - Present

Content Moderator & Trust-Safety Reviewer (Majorel / Meta Content Review Programme)

Text

Reviewed and evaluated user-generated content against community standards with nuanced policy judgment for training and policy improvement workflows. Escalated edge cases involving misinformation, self-harm cues, and coordinated inauthentic behavior for further action. Produced structured written rationales that served as reference logs during appeals and calibration. • Assessed 300–500 content items daily for compliance and trust-and-safety risks. • Flagged and escalated high-risk edge cases to support policy updates. • Maintained decision accuracy of 94% across monthly calibration audits. • Wrote structured rationales for non-obvious moderation calls to aid reviewer consistency.

2022 - 2022

Data Labelling Specialist – NLP & Conversational AI (Toloka AI)

TextClassification

Labeled conversational utterances for a multinational chatbot project using CONLL and a custom schema format. Tagged dialogue acts, speaker intent, and slot entities to support downstream conversational AI training. Participated in weekly calibration and conflict resolution to maintain label consistency. • Annotated 5,000+ dialogue utterances with dialogue acts, intent, and slot/entity labels. • Reviewed and corrected inter-annotator conflicts to improve agreement (Cohen’s Kappa > 0.82). • Translated English annotation guidelines into local-language summaries for onboarding. • Identified label drift patterns and contributed to guideline updates improving accuracy by 11%.

2022 - 2022

Research Assistant – Data Collection & Coding (University of Lagos Research Unit)

TextData Collection

Collected, cleaned, and coded qualitative survey data to create a labeled dataset for analysis. Applied thematic coding frameworks and built a standardized coding guide to reduce labeling disagreements across coders. Validated dataset integrity by checking responses against demographic benchmarks and removing inconsistent entries. • Collected and cleaned a 10,000-record qualitative survey dataset and prepared it for coding. • Applied thematic coding frameworks using NVivo and maintained coding consistency. • Developed a standardized coding guide to reduce inter-coder disagreement from 18% to 6%. • Cross-referenced responses against demographic benchmarks, removing 340 inconsistent entries.

2021 - 2022

Education

Work History