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JhenyfferOliveira/README.md

Hello world!

Hi 👋🏾 I'm Jhenyffer

Data Analyst | Business Intelligence · SQL · Python · ETL/ELT · BigQuery · Tableau · Looker Studio


👩🏾‍💻 About me

Data analyst with 2+ years of experience in analytics and BI at tech companies in Brazil, currently at Mercado Libre, previously at enjoei. I work with data oriented to business decisions across operations, logistics, product, and risk & fraud prevention, building end-to-end pipelines, analytical bases, and dashboards that support both operational teams and executive leadership.

My background in Linguistics gives me something that SQL alone doesn't: I ask the right question before writing the query. I translate numbers into decisions.

Native in Brazilian Portuguese, proficient in English and Spanish.


✨ What I do

  • 📊 Build analytical pipelines (ETL/ELT) and BI dashboards for operational and strategic decision-making
  • 🔍 Work with data across logistics, product, and risk & fraud prevention in high-scale tech environments
  • 🗣️ Translate complex data into clear insights for both technical and non-technical stakeholders
  • 🤖 Apply Generative AI tools (Claude, ChatGPT, Gemini) to support analysis, documentation, and hypothesis generation
  • ✍🏾 Write about data, SQL, Python, and analytics on Medium

🛠️ Current stack

Languages: Python, SQL, JavaScript
Data & BI: BigQuery, Dataform, Tableau, Looker Studio, Metabase, Power BI
Pipelines: ETL/ELT, Google Cloud Dataflow, Google Apps Script, APIs REST, Node.js
Other tools: AppSheet, GitHub, Confluence, Scrum
GenAI: Claude, ChatGPT, Gemini

Python Numpy Pandas Seaborn Matplotlib Scikit-learn Django SQL PostgreSQL SQLite Metabase Power BI Tableau Looker Studio


🚀 Featured projects

End-to-end data pipeline built to collect Instagram metrics through the Meta Graph API, store raw data in Google Sheets via API, and support dashboards in Looker Studio through Python automation. Reduced manual reporting time and enabled data-driven decisions for the NGO's social media strategy.

Tech: Python · Meta Graph API · ETL · Google Sheets API · Looker Studio · GitHub Actions · Google Cloud


Customer segmentation project using K-Means clustering on credit card behavioral data, applied to identify customer profiles and support CRM strategy. Includes exploratory data analysis, optimal K selection, PCA visualization, cluster profiling, and statistical validation.

Tech: Python · pandas · scikit-learn · PCA · statistics


Hackathon project developed as part of team InclusiData Alchemy, focused on a diversity and inclusion analytics solution based on a marketplace-style business challenge. Awarded 2nd place in the data category.

Tech: Data analysis · dashboarding · problem framing · business analytics


✍🏾 Writing

I write in Portuguese about data, SQL, Python, and analytics careers.

Some selected articles (written in Brazilian Portuguese / pt-BR):

More articles on Medium.


📚 Training projects

Repositories developed during technical training programmes and bootcamps (2023–2024).

🎓 Ada Tech – Data Science

💻 WoMakersCode – Python and Django


🌐 Contact

Pinned Loading

  1. pipeline-espaco-logos pipeline-espaco-logos Public

    🚀 Instagram data pipeline for an NGO that stores info in Sheets and powers a Looker dashboard

    Python 1

  2. Hackaton-ADAHACK Hackaton-ADAHACK Public

    🏅 Project developed for hackaton solution.

    Jupyter Notebook 2

  3. Projeto-PowerBI-Ada Projeto-PowerBI-Ada Public

    📉 Final Project for Power BI course.

    Jupyter Notebook 1 1

  4. Projeto-Estatistica-Ada Projeto-Estatistica-Ada Public

    📈 Final project for Statistics course.

    Jupyter Notebook 2 1

  5. Projeto-AnaliseDados-Ada Projeto-AnaliseDados-Ada Public

    📊 Final project for Programming Techniques course.

    Jupyter Notebook 1

  6. BlogNoticias-Django-WoMakersCode BlogNoticias-Django-WoMakersCode Public

    📰 Django Web News Blog.

    Python 1