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Mariana Nascimento

@mariananascimento

Data Scientist with 3+ years of experience in Machine Learning, Natural Language Processing (NLP), predictive modeling, and the development.

Brazil

Message

What I'm looking for

Quero atuar como Cientista de Dados construindo APIs e pipelines de ML/NLP, transformando dados complexos em insights acionáveis e automatizando processos com foco em qualidade, desempenho e impacto no negócio.

Data Scientist with 3+ years of experience in Machine Learning, Natural Language Processing (NLP), predictive modeling, and the development of AI-driven systems. Proven track record in building data pipelines and developing Machine Learning models applied to real-world business problems, leading end-to-end workflows from data preprocessing and exploratory data analysis (EDA) to model development, validation, and performance evaluation.

Hands-on experience in developing LLM-based systems, creating intelligent agents, enhancing chatbots, and delivering solutions for fraud detection, overpricing detection in public procurement, and predictive simulations focused on product strategy and data-driven decision-making.

Analytical profile with strong business acumen and a focus on generating measurable impact through data-driven decision-making, transforming data into strategic insights, and optimizing processes.

Tech Stack: Python, SQL, Pandas, NumPy, Scikit-learn, TensorFlow/Keras, PySpark, FastAPI, Hugging Face, LangChain, BigQuery, Looker Studio, Power BI, GCP.

Experience

Work history, roles, and key accomplishments

Junior Data Scientist

CESAR

Feb 2025 - Dec 2025 (10 months)

• Developed and implemented API routes using FastAPI to expose AI services and integrate language models
into production pipelines.
• Contributed to intelligent agent development using LangChain and LangGraph, optimizing responses and
reducing processing time in oil and gas applications.
• Applied prompt engineering techniques to enhance model performance and response accuracy.

Lang Chain fastAPI Python scikit learn NumPy Pandas

Junior Data Analyst

indaband

Sep 2023 - Apr 2024 (7 months)

Developed analytical dashboards and performance reports in Looker Studio to monitor growth and
engagement metrics.
• Performed user behavioral analyses to identify usage patterns and churn, guiding retention strategies.
• Delivered actionable insights supporting product and engagement strategies.
• Identified feature improvement opportunities using behavioral analytics and metrics.

GCP Looker Studio

Open Source Core Member

OpenDevUFCG

Jan 2021 - Apr 2024 (3 years 3 months)

Maintained collaborative open-source GitHub projects and supported event web development using React and CSS. Mentored contributors and helped plan and organize events with partner organizations.

GitHub React CSS Mentoring Web Development Event Planning Team Coordination

Data Science Intern

UFCG Distributed Systems Lab

Nov 2022 - Jun 2023 (7 months)

Built end-to-end data ingestion, cleaning, and classification pipelines to identify overpricing in public procurement documents. Developed NLP models for automated extraction and inference, and automated document workflows to reduce manual analysis time.

NLP Document Classification Data Extraction Data Cleaning Data Pipelines Machine Learning Python

Data Science Intern

IBM

Nov 2021 - Nov 2022 (1 year)

Performed exploratory data analysis and statistical modeling for banking fraud detection. Developed ML pipelines with statistical validation and improved chatbot performance using NLP in Watson Studio to support data-driven decisions.

Fraud Detection Machine Learning Statistical Modeling NLP Watson Studio Python

Data Science Intern

Dell EMC

Aug 2020 - Oct 2021 (1 year 2 months)

Developed ML and deep learning pipelines for automated customer response systems in an R&D project with Dell. Implemented NLP-based classification and automated response generation, tuned models for performance, and built a React/JavaScript web tool to operationalize the solution.

Deep Learning Machine Learning NLP And Automated Responses Hyperparameter Tuning React JavaScript