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S
Sebastian C.

Sebastian C.

AI Training Specialist & Full-Stack Developer

Peru flagLima, Peru

Key Skills

Software

AppenAppen
Scale AIScale AI
AWS SageMakerAWS SageMaker
ArgillaArgilla

Top Subject Matter

Software Development – Code Review & Quality Assurance
Artificial Intelligence – LLM Training & Evaluation
Technology – SaaS, Web Apps & Developer Tools

Top Data Types

Computer Code ProgrammingComputer Code Programming

Top Task Types

Computer Programming/CodingComputer Programming/Coding
RLHFRLHF
Evaluation/RatingEvaluation/Rating
Text GenerationText Generation
ClassificationClassification

Freelancer Overview

Full-Stack Software Engineer. Brings 5+ years of professional experience across complex professional workflows, research, and quality-focused execution. Education includes Bachelor of Software Engineering, Universidad Peruana de Ciencias Aplicadas (UPC) (2025).

Labeling Experience

Multi-Domain AI Training & Code Evaluation for LLM Fine-Tuning

Computer Code ProgrammingComputer Code ProgrammingRLHFRLHF

Over the past 2+ years, I have contributed to multiple AI training and data labeling projects focused on improving the performance, reliability, and safety of large language models (LLMs). My work has included evaluating model outputs across coding tasks (Python, JavaScript, TypeScript, Java, SQL), writing high-quality prompts, designing binary rubrics for objective model evaluation, and producing detailed feedback used for supervised fine-tuning and RLHF pipelines. I have experience identifying hallucinations, logical errors, and code quality issues in AI-generated responses, ensuring that final datasets meet strict accuracy and formatting standards. I am familiar with tools such as Git/GitHub, Docker, and containerized workflows, and consistently follow detailed annotation guidelines to deliver consistent, audit-ready output at scale.

2023 - Present

Education

U

Universidad Peruana de Ciencias Aplicadas (UPC)

Bachelor of Software Engineering, Software Engineering

Bachelor of Software Engineering
2021 - 2025

Work History

G

Grupo Coril

Full-Stack Software Engineer

Lima
2025 - Present
E

ecomserv

Backend Java Developer

Lima
2022 - 2025