Hello, I'm Alexandre

Data Scientist

I transform data into valuable insights through statistical analysis, machine learning and data visualization to support strategic decisions.

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Alexandre

About Me

Get to know my journey and experience

I'm a Data Scientist passionate about discovering patterns and hidden insights in data. With experience in statistical analysis, machine learning and data visualization, I work to transform raw data into strategic information.

My approach combines scientific rigor with creativity to solve complex problems and generate real value for organizations through data-driven solutions.

9+ Completed Projects
10+ Technologies
100% Dedication
Working with data

Professional Experience

My journey and key accomplishments

Data Scientist

Independent Projects 2022 - Present
  • Delivered 9+ end-to-end data science projects focused on predictive analytics and executive storytelling.
  • Implemented ETL/ELT pipelines with Apache Airflow and dbt to process large data volumes reliably.
  • Built executive Power BI dashboards that generated actionable insights for decision-makers.
  • Trained machine learning models reaching an average of 92% accuracy on classification problems.
Python SQL Power BI Airflow Docker MongoDB

Technology Stack

Tools and platforms I master

Languages

Python
9+ years
SQL
6+ years
JavaScript
3+ years

Data Science & ML

Pandas
Expert
Scikit-learn
Advanced
TensorFlow
Intermediate
NumPy
Advanced

Visualization & BI

Power BI
Expert
Matplotlib
Advanced
Plotly
Advanced

Data Engineering

Apache Airflow
Advanced
Docker
Advanced
dbt
Advanced

Databases

PostgreSQL
Advanced
MongoDB
Advanced
MySQL
Advanced

Cloud & DevOps

Google Cloud
Intermediate
Git
Advanced
CI/CD Pipelines
Advanced

Technical Skills

How I interact with technologies in my daily work

alexandre@skillset:~$
Python
>>> if isinstance(alexandre, PythonExpert) and alexandre.experience > 5: return "Automation, analysis, and APIs? Just call me!"
Automation, analysis, and APIs? Just call me!
SQL
sql> SELECT skill, proficiency FROM expertise WHERE developer = 'alexandre' AND skill LIKE '%SQL%' HAVING proficiency = 'Advanced' /* Optimized query, indexes used! */
skill: SQL | proficiency: Advanced
Pandas
>>> df = pd.read_csv('challenge.csv') df.groupby('problem').apply(alexandre.solve) # Result: insights ready for decision-making
DataFrame transformed successfully!
Docker
$ docker build -t alexandre/solution:latest . && docker run --rm -e PROBLEM=complex alexandre/solution:latest
Container running... Problem solved!
Power BI
DAX> CALCULATE([Insights], FILTER(ALL('Projects'), [Author]="Alexandre" && [Level]="Advanced" ) )
Interactive dashboard created!
Git
$ git commit -m "feat: robust solution delivered by Alexandre" && git push origin main
[main abc123] feat: robust solution delivered by Alexandre
MongoDB
> db.skills.aggregate([ { $match: { user: "alexandre", skill: "MongoDB" } }, { $project: { proficiency: 1, pipelines: 1 } } ])
{ "proficiency": "Advanced", "pipelines": "Expert" }
Airflow
>>> with DAG('alexandre_pipeline', schedule_interval='@daily') as dag: run_etl = PythonOperator( task_id='run_etl', python_callable=alexandre.advanced_etl )
Airflow pipeline active and monitored!
Matplotlib
>>> import matplotlib.pyplot as plt plt.style.use('alexandre_custom') plt.plot(data, color='insights') plt.title('Another visualization that tells a story')
Chart saved: storytelling_with_data.png
Machine Learning
>>> from sklearn.ensemble import RandomForestClassifier model = alexandre.train_model(data, target) print(f"Accuracy: {model.score(X_test, y_test):.2%}")
Accuracy: 94.7% - Model ready for production!

Certifications

Validations of my technical competencies

Pulling the latest badges from Credly...

Verified competencies

Automatically synced from Credly

Mapping recognized skills...

Featured Projects

Solutions I developed to solve real problems

Data Scientists Guide

Data Scientists Guide

Complete guide for data scientists with methodologies, best practices and essential resources for professionals in the field.

Python Data Science Documentation
CSV Insights Tool

CSV Insights Tool

Interactive web tool for automatic analysis of CSV files, generating statistical insights and real-time visualizations.

JavaScript D3.js Data Visualization
Habits and Performance Analysis

Habits and Performance Analysis

Statistical analysis of correlation between personal habits and academic/professional performance using machine learning techniques.

Python Pandas Scikit-learn
AI Resume Optimizer Chrome Extension

AI Resume Optimizer (Chrome Extension)

Official Chrome extension powered by generative AI to benchmark your résumé against job descriptions, highlight missing keywords, and suggest instant improvements.

NLP Python Text Analysis
Adventure Works - Executive Data Analysis

Adventure Works - Executive Data Analysis

Interactive dashboard developed for financial analysis of Adventure Works bicycle company, with Machine Learning projections for 2022 and Brazilian market analysis.

Power BI Machine Learning SQL Business Intelligence
Machine Learning Algorithms

Learn Machine Learning Visually

Interactive educational platform for teaching machine learning concepts through dynamic visualizations and accessible practical examples.

JavaScript D3.js Educational Tech Interactive Learning
KPIs Governance Dashboard

KPIs Governance Dashboard

Executive dashboard for data governance and strategic KPIs, featuring a modern lakehouse architecture and automated ETL/ELT pipeline for data-driven decisions.

Data Engineering Apache Airflow dbt Data Governance Business Intelligence
Data Engineer Case - DataOps MongoDB Python

Data Engineer Case - DataOps Pipeline

Complete data processing system with DataOps pipeline integrating Python and MongoDB, offering full support for local, remote and Docker environments with advanced functionality.

Python MongoDB Pandas Docker DataOps
Windows Event Log Analyzer

Windows Event Log Analyzer

Advanced tool for analyzing Windows event logs with AI-powered insights. Features intelligent pattern recognition, security analysis, and automated reporting for system administrators.

JavaScript HTML5 CSS3 Google Gemini API AI Analysis

More Projects on GitHub

Complete list of my own repositories (no forks) focused on AI, data, automation, and productivity.

Repository

agentdemo24por7

24/7 multi-agent orchestrator that triages tickets autonomously with LangGraph/LangChain state machines.

LLMs Agents Automation
Open on GitHub

Repository

alex-des-santos

Interactive README that highlights mission, principles, and professional roadmap.

Portfolio Markdown Community
Open on GitHub

Repository

analise-habitos-desempenho

Research that connects students' habits and performance using notebooks, visualizations, and statistical experiments.

Python Pandas EDA
Open on GitHub

Repository

Case-Analista-Dados

Adventure Works executive dashboard with forecasting, What-If analysis, and Brazil-specific storyline.

Power BI Forecast Business
Open on GitHub

Repository

Case-Engenheiro-dados

DataOps challenge with Python + MongoDB pipelines, Dockerized environments, and full operational docs.

DataOps MongoDB Docker
Open on GitHub

Repository

csv-insights-tool

Browser-based CSV analyzer that produces instant statistics and D3.js charts for huge files.

JavaScript D3.js Data Viz
Open on GitHub

Repository

dash-desmatamento-fogo-chuva

Plotly Dash dashboard that cross-analyzes deforestation, fire spots, and rainfall across Brazilian biomes.

Dash APIs Sustainability
Open on GitHub

Repository

datascients-guide

Open guide to build a compelling data science portfolio with checklists, templates, and curated references.

Mentoring Documentation Python
Open on GitHub

Repository

encceja-pandemia-impact-analysis

Pandemic impact analysis on ENCCEJA results combining public datasets and notebook storytelling.

Pandas Education Storytelling
Open on GitHub

Repository

kpis-governance-dashboard

End-to-end data governance case with strategic KPIs, architecture diagrams, and BI deliverables.

Data Governance dbt Power BI
Open on GitHub

Repository

machine-learning-alg

Visual playground that explains ML algorithms with interactive demos and intuitive charts.

JavaScript Education ML
Open on GitHub

Repository

network-troubleshooting

Interactive guide that walks home users through network diagnostics via dynamic Q&A flows.

UX Web App Networking
Open on GitHub

Repository

promptsections

Streamlit app that breaks long Stable Diffusion/ComfyUI prompts into reusable sections for faster iteration.

Streamlit Stable Diffusion Generative AI
Open on GitHub

Repository

resume-otimizator

Engine behind the AI Resume Optimizer that compares job posts vs. CVs and powers the Chrome extension.

NLP Career Chrome Ext
Open on GitHub

Repository

whatsapp-rpg-gm

Automated Dungeon Master for WhatsApp that manages sheets, dice rolls, and full D&D storytelling with AI.

Python Bots RPG
Open on GitHub

Repository

windows-event-analyzer

Web tool that interprets Windows Event Viewer logs, flags critical signals with AI, and speeds up troubleshooting.

Observability Gemini AI Logs
Open on GitHub
Browse all repositories

Let's Talk?

Get in touch for discussions about projects and opportunities

LinkedIn

Connect with me

alex-des-santos

GitHub

See my projects

alex-des-santos

Email

Send me a message

eu@alexandre.pro