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Marcelo Brandão

Marcelo Brandão

Technical Support Engineer - SaaS, Automation & AI

PORTUGAL flag
Lisbon, Portugal
$30.00/hrIntermediateLabelboxOtherInternal Proprietary Tooling

Key Skills

Software

LabelboxLabelbox
Other
Internal/Proprietary Tooling

Top Subject Matter

No subject matter listed

Top Data Types

AudioAudio
Computer Code ProgrammingComputer Code Programming
DocumentDocument
ImageImage
TextText
VideoVideo

Top Label Types

Audio Recording
Classification
Computer Programming Coding
Data Collection
Evaluation Rating
Fine Tuning
Function Calling
Prompt Response Writing SFT
Text Generation
Text Summarization
Transcription
Translation Localization

Freelancer Overview

I have hands-on experience in AI data annotation and validation, having worked as an AI Data Tutor for both xAI and Stellar AI. In these roles, I executed multimodal data tasks, wrote and validated AI outputs in English and Portuguese, and designed prompts to enhance LLM instruction-following accuracy. My background in technical support and automation has given me strong skills in debugging, log analysis, and handling structured data formats like JSON, Python, and JavaScript. I am comfortable using tools such as Postman, SQL, and various documentation platforms, and I have contributed to improving LLM output quality by correcting JSON schemas and validating structured outputs. My attention to detail and ability to communicate technical concepts clearly allow me to deliver high-quality data labeling and annotation work for AI training.

IntermediateEnglishSpanishPortuguese

Labeling Experience

Bilingual AI Data Localization

Internal Proprietary ToolingTextClassificationFine Tuning
In this role, I evaluated and validated structured and unstructured outputs from large language models in English and Portuguese. My responsibilities included assessing the correctness, alignment, and linguistic reliability of multimodal outputs, including JSON-based responses. I contributed to data annotation, consistency checking, and dataset curation within side-by-side comparison and QA workflows. • Conducted evaluation of text, image, audio, and video outputs for hallucinations and instruction-following reliability. • Performed criteria-based validation and surfaced quality regressions and edge cases. • Improved annotation consistency and reported workflow/tooling limitations. • Enhanced evaluation reliability and contributed to deployment readiness.

In this role, I evaluated and validated structured and unstructured outputs from large language models in English and Portuguese. My responsibilities included assessing the correctness, alignment, and linguistic reliability of multimodal outputs, including JSON-based responses. I contributed to data annotation, consistency checking, and dataset curation within side-by-side comparison and QA workflows. • Conducted evaluation of text, image, audio, and video outputs for hallucinations and instruction-following reliability. • Performed criteria-based validation and surfaced quality regressions and edge cases. • Improved annotation consistency and reported workflow/tooling limitations. • Enhanced evaluation reliability and contributed to deployment readiness.

2025 - 2025

AI Data Evaluator

OtherComputer Code ProgrammingClassificationFine Tuning
• Interpreted Python and JavaScript scripts to identify logic, syntax, and execution issues. • Debugged scripts in VSCode, solving dependency, environment, and runtime errors. • Analyzed structured outputs (including JSON) against expected behavior and constraints. • Designed prompts to generate code, and refined them by running, debugging, and correcting.

• Interpreted Python and JavaScript scripts to identify logic, syntax, and execution issues. • Debugged scripts in VSCode, solving dependency, environment, and runtime errors. • Analyzed structured outputs (including JSON) against expected behavior and constraints. • Designed prompts to generate code, and refined them by running, debugging, and correcting.

2024 - 2025

Education

U

Universidade Federal do Rio Grande do Norte

Master of Economics, Economics

Master of Economics
2018 - 2021
U

Universidade Federal do Rio Grande do Norte

Bachelor of Economics, Economics

Bachelor of Economics
2011 - 2017

Work History

M

Multilogin Software

Technical Support Engineer

Remote
2023 - 2025
C

Crossover

Operations Support Analyst

Remote
2022 - 2023