João F.

Key Skills

Software

Labelbox

Scale AI

Remotasks

CVAT

Appen

Top Subject Matter

Technology – Conversational AI & Chatbot Training

E-commerce – Product Categorization & Customer Support

Technology – NLP & Model Evaluation

Top Data Types

Video

Image

Text

Top Task Types

Classification

Object Detection

RLHF

Fine-tuning

Evaluation/Rating

Freelancer Overview

Freelance AI training contributor with hands-on experience in text annotation, image/video labeling, RLHF feedback, prompt writing, and data quality review. I cover the full labeling pipeline and bring a sharp eye for consistency and detail. My RLHF and prompt evaluation work gives me a practical understanding of what makes training data actually improve model performance.

Labeling Experience

Customer Support Chatbot – NLP Fine Tuning

TextFine-tuning

Contributed text samples and corrective feedback to fine-tune a customer support chatbot. Wrote and reviewed 1,200+ prompt-response pairs, flagged tone inconsistencies, and helped refine the model's handling of complaint and refund scenarios.

2023 - 2023

E-commerce Product Image Classifier

ImageClassification

Classified product images across 40+ categories for a retail AI model. Reviewed over 8,000 images for correct category placement, handling edge cases like multi-category items. Maintained 97% accuracy with weekly QA audits.

2023 - 2023

Education

Work History