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Raffaele Matacena

Raffaele Matacena

Freelance AI Trainer - Language and Localization

Spain flagMahón, Spain
$30.00/hrExpertAppenClickworkerKili Technology

Key Skills

Software

AppenAppen
ClickworkerClickworker
Kili TechnologyKili Technology
LabelboxLabelbox
MercorMercor
MindriftMindrift
RemotasksRemotasks
Scale AIScale AI
TelusTelus

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
DocumentDocument
TextText
VideoVideo

Top Task Types

Classification
Data Collection
Evaluation Rating
Prompt Response Writing SFT
Red Teaming
RLHF
Text Generation
Text Summarization
Transcription
Translation Localization

Freelancer Overview

I am an experienced freelance AI trainer and data annotator with over 2000 hours dedicated to training large language models and generative AI systems for leading clients such as Google, Amazon, Meta, Uber, and Nvidia. My expertise spans SFT, RM, and RLHF processes, as well as SxS performance evaluation, prompt and response writing, factuality and safety checks, localization, and machine translation error annotation. I am highly proficient in using platforms like Outlier, Labelbox/Alignerr, Google DataCompute, Amazon Nova, and Datamundi. With a strong background in language and localization, I deliver high-quality, domain-specific data annotation and evaluation for NLP and web search assistants, ensuring accuracy, relevance, and cultural appropriateness in multiple languages.

ExpertCatalanEnglishItalianSpanish

Labeling Experience

Kili Technology

Medical transcriptions for AI training

Kili TechnologyAudioTranscription
Transcription of recorded patient visits to train healthcare/medical AI assistant.

Transcription of recorded patient visits to train healthcare/medical AI assistant.

2025
Mercor

Italian writer for AI training

MercorTextRLHFPrompt Response Writing SFT
LLM prompt and response editing to draft a "golden response".

LLM prompt and response editing to draft a "golden response".

2025
Telus

Multiple-round conversational model testing for Telus

TelusAudioRLHF
Multiple-round conversational model testing

Multiple-round conversational model testing

2025
Scale AI

Pegasus HLE (on Outlier)

Scale AITextPrompt Response Writing SFT
The project aimed at generating higly complex domain-specific prompts to make the models fail (i.e., 'stumping' the models), in order to create an extremely rigorous benchmark for LLM testing.

The project aimed at generating higly complex domain-specific prompts to make the models fail (i.e., 'stumping' the models), in order to create an extremely rigorous benchmark for LLM testing.

2025
Labelbox

LLM training on Labelbox/Alignerr (various projects)

LabelboxTextText GenerationTranslation Localization
Performed a variety of different LLM training projects on Alignerr/Labelbox.

Performed a variety of different LLM training projects on Alignerr/Labelbox.

2024

Education

U

University of Milan Bicocca

Doctor of Philosophy, Sociology

Doctor of Philosophy
2014 - 2018
C

Catholic University of the Sacred Heart of Brescia

Postgraduate Degree, Food Management and Green Marketing

Postgraduate Degree
2013 - 2014

Work History

U

University of Milan Bicocca

University Researcher in Rural and Economic Sociology

Milan
2014 - 2023
U

University of Milan Bicocca

Post-Doctoral Researcher

Milan
2019 - 2021