Matías Castro

Key Skills

Software

Appen

Clickworker

Data Annotation Tech

Labelbox

OneForma

Remotasks

Scale AI

SuperAnnotate

Toloka

Top Subject Matter

LLM Evaluation in English

LLM Evaluation in Spanish

Image Classification

Top Data Types

Audio

Text

Video

Top Task Types

Audio Recording

Prompt Response Writing SFT

RLHF

Text Generation

Translation Localization

Freelancer Overview

I have worked 10+ years as a software tester, in all kinds of projects from mobile games up to AI-driven, video-based, object-classifying-and-tracking systems, and everything in between. I am proficient in API testing, SQL, and all things manual testing. I have also worked 8 years as a photographer and videographer. I have editing skills and am knowledgeable about these fields. I love music, am a musician myself, and love trivia about the artists and albums I love. The same with cinema and TV. I used to write comprehensive reviews on albums and movies I loved, since recommending these kinds of things gives me the nicest feeling. I am knowledgeable about arts, being an only child to a painter, growing up imbued in it. I have done a few years of stand up comedy, I actually think of comedy as a great vehicle for ideas you would struggle to get through in a straight manner. I have made furniture. I make analog collages. I play soccer and tennis. I am sort of a jack of all trades, love variety in my life, and trying everything once. I become passionate about things. I am a perfectionist and very interested in words, their choice and usage, and have dabbled in writing in the form of poetry, short stories, and comedy. I believe in words and their power. I have C2 level English, know basic Portuguese and French, and am currently learning Italian.

Reviews (1)

Labeling Experience

Various projects for DA

Data Annotation TechTextClassificationTranslation Localization

Have worked in various projects, all of them LLM related, mostly CBs, with rating, edition, comparison, fine-tuning, localization, safety adherence, tool calling evaluation and more, some including images or audio recording, transcribing, and translating as well.

Have worked in various projects, all of them LLM related, mostly CBs, with rating, edition, comparison, fine-tuning, localization, safety adherence, tool calling evaluation and more, some including images or audio recording, transcribing, and translating as well.

2024

Education

Work History