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Rauan Pereira

@rauanpereira

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Data annotator and junior cybersecurty analyst enthusiast with AI experience.

Brazil

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What I'm looking for

I seek roles where I can apply cybersecurity, Data annotation/analysis and AI skills, contribute to secure systems, grow technically, and work in collaborative, learning-focused teams.

I am a junior cybersecurity analyst and data practitioner with hands-on experience finding vulnerabilities, evaluating large language models, and supporting security teams. I have participated in multiple freelance and contractor projects focused on security assessment, data annotation, and AI evaluation.

I have worked as an independent contractor/freelance for platforms such as Appen and Telus International, completing over ten projects across search engine evaluation, audio transcription, labeling, and LLM evaluation. As a freelancer I completed over five projects assisting senior analysts and developers with cybersecurity protocols and breach analysis.

My academic background includes ongoing Information Security studies, a Data Science pathway through Oracle Next Education/Alura, Cisco Network and Cybersecurity training, and Harvard’s CS50 Python course. I bring practical skills in network and application assessment, prompt engineering, and generative AI training.

I am organized, proactive, and team-oriented, with experience managing internal goals and implementing controls in an academic/internal manager role. I communicate fluently in Portuguese and English and continue to develop technical depth in Python, network analysis, and data tools.

Experience

Work history, roles, and key accomplishments

Current

Freelance Junior Cybersecurity Analyst

Current

Confidential Company

May 2024 - Present (1 year 9 months)

Assisted Analysis Team in conducting vulnerability analysis that led to a 25% decrease in security breaches.
Collaborated with the analysis team to detect potential network breaches and develop preventive measures for physical network security.

Vulnerability Assessment Application Security Network Security Penetration Testing Communication

Current

Freelance Data Annotator

Current

Appen

May 2023 - Present (2 years 9 months)

Completed 10+ remote projects including search engine evaluation, data annotation, and large language model evaluation to improve AI training datasets.

Search And Evaluation Data Annotation Prompt Engineering Quality Assurance Teamwork

Current

Freelance Data Annotator

Current

TELUS International AI Inc

May 2022 - Present (3 years 9 months)

I currently work on projects available on the Telus International platform, such as AI training for Large Language Models. I typically work on projects focused on data analysis and annotation, as well as audio transcription and text/translation evaluation and quality assurance, aiming to improve the model's understanding and responsiveness.

AI LLM Prompt Engineering Transcription Data Analysis Data Annotation

Internal Manager

Calipro - UFSC

Mar 2021 - Jan 2023 (1 year 10 months)

Managed internal goals, materials and virtual library content, handled internal and external service, recruitment, and implemented internal controls between 2021 and 2023.

Internal Financial Management Excel Power BI VBA Recruitment Organization

Education

Degrees, certifications, and relevant coursework

Cidade Verde University Center

Bachelor, Information Security

2025 -

Degree in Information Security in progress with studies in cyber security, Python programming, network analysis, social sciences, and Brazilian Sign Language.