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Cassiano Abreu

Cassiano Abreu

AI Decision Engine - LLM Prompting & Output Evaluation

Brazil flagGoiânia, Brazil
$15.00/hrIntermediateAppenClickworkerAxiom AI

Key Skills

Software

AppenAppen
ClickworkerClickworker
Axiom AI
ArgillaArgilla
AWS SageMakerAWS SageMaker
Other

Top Subject Matter

Banking Credit Risk Analysis
Human Resources Content Generation
Automated Video Content Creation

Top Data Types

TextText
VideoVideo
DocumentDocument

Top Task Types

Text GenerationText Generation
ClassificationClassification
Entity (NER) ClassificationEntity (NER) Classification
Computer Programming/CodingComputer Programming/Coding
Data CollectionData Collection
Prompt + Response Writing (SFT)Prompt + Response Writing (SFT)
Text SummarizationText Summarization

Freelancer Overview

Software Developer and Systems Analyst with a strong background in Internal Auditing and Process Optimization. I specialize in architecting AI-driven workflows and proprietary decision engines using LLMs like Claude and GPT-4o. My experience includes designing end-to-end automated pipelines for content generation (TikTokBot) and building production-grade HR SaaS platforms (Talentto AI), where I personally handle prompt engineering, output evaluation, and model refinement. With extensive experience in compliance and technical documentation, I bring a meticulous approach to data labeling and RLHF. I am expert at bridging the gap between complex business logic and high-quality AI responses, ensuring technical accuracy, security (RS256/JWT), and adherence to strict project guidelines.

IntermediateEnglish

Labeling Experience

LLM AI Prompt Engineering & Output Review (HR SaaS)

TextText Generation
Developed and optimized content generation pipelines for HR SaaS using Claude 3.5 Sonnet. Created, tested, and improved prompts for automated HR document and email production. Reviewed and ensured quality, relevance, and compliance of LLM-generated outputs for various client use-cases. • Conducted prompt engineering for HR content tasks. • Evaluated outputs for tone, accuracy, and privacy standards. • Integrated feedback to refine AI behavior for HR contexts. • Maintained quality assurance on production-generated content.

Developed and optimized content generation pipelines for HR SaaS using Claude 3.5 Sonnet. Created, tested, and improved prompts for automated HR document and email production. Reviewed and ensured quality, relevance, and compliance of LLM-generated outputs for various client use-cases. • Conducted prompt engineering for HR content tasks. • Evaluated outputs for tone, accuracy, and privacy standards. • Integrated feedback to refine AI behavior for HR contexts. • Maintained quality assurance on production-generated content.

2026 - Present

AI Decision Engine - LLM Prompting & Output Evaluation

TextText Generation
Implemented an automated AI decision engine for credit assessments using GPT-4o Mini. Developed branded PDF reports with written credit justifications driven by LLM outputs. Designed prompts and evaluated generated decision texts for reliability and clarity. • Designed and refined prompt engineering for text-based AI decision justifications. • Assessed quality and accuracy of LLM outputs in credit risk contexts. • Ensured outputs aligned with regulatory and domain requirements. • Validated generated content for report integration.

Implemented an automated AI decision engine for credit assessments using GPT-4o Mini. Developed branded PDF reports with written credit justifications driven by LLM outputs. Designed prompts and evaluated generated decision texts for reliability and clarity. • Designed and refined prompt engineering for text-based AI decision justifications. • Assessed quality and accuracy of LLM outputs in credit risk contexts. • Ensured outputs aligned with regulatory and domain requirements. • Validated generated content for report integration.

2026 - Present

AI Scriptwriting & Prompt+Response Generation (TikTokBot)

TextText Generation
Integrated Claude API to automate scriptwriting for short-form video content. Crafted, tested, and refined prompts for generating multilingual video scripts relevant to TikTok audiences. Verified and revised AI-generated outputs to align with creative and audience engagement goals. • Structured prompt+response format testing for video content. • Evaluated AI-written scripts for cohesion and branding. • Adjusted prompt inputs for improved output quality. • Managed workflow for automated content script generation.

Integrated Claude API to automate scriptwriting for short-form video content. Crafted, tested, and refined prompts for generating multilingual video scripts relevant to TikTok audiences. Verified and revised AI-generated outputs to align with creative and audience engagement goals. • Structured prompt+response format testing for video content. • Evaluated AI-written scripts for cohesion and branding. • Adjusted prompt inputs for improved output quality. • Managed workflow for automated content script generation.

2026 - 2026

Education

F

FATESG SENAI

Bachelor of Science, Systems Analysis and Development

Bachelor of Science
2023 - 2026
P

Pontifical Catholic University of Goiás

Bachelor of Science, Production Engineering

Bachelor of Science
2020 - 2025

Work History

C

Cielo

Business Manager & Solutions Developer

Goiânia
2025 - 2026
B

Business Solutions

Consultant & Auditor

Goiânia
2016 - 2025