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chels-j/README.md

Hi, I'm Chels πŸ‘‹

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After a 5 year career in the sustainabiltiy & ESG domain, I'm transitioning to a role in in data science & analytics for a variety of industries.

I started my career as a sustainability analyst, with a degree in environmental science and a drive to make a difference. But along the way, I discovered something unexpected: a love for data. What began with simple Excel templates soon grew into a keen interest in coding and data visualization. I excel at asking insightful questions and using structured problem-solving, clean code and easy to read visuals to answer them.

I'm happiest when I can apply my knack for data-driven analysis and problem-solving together with writing. With 5+ years of experience in sustainability analytics, focusing on carbon emissions and climate policy, I’ve seen firsthand how communicating data simply and effectively can make or break the power of a story.

Now, with an Master's degree in Data Science from Tilburg University, I’m eager to bring my analytical skills to new domains. Beyond sustainability, I’m excited to apply my skills in Python, SQL, Power BI, machine learning and data engineering to solving problems and generating insights in sectors such as operations, marketing, HR & people analytics.

πŸ”Ž Here you can see some of the projects I've completed to demonstrate my skillset in:

  • Querying, cleaning and transforming data using Python & SQL
  • Data visualization using libraries like matplotlib and seaborn
  • Data modeling & dashboarding using Power BI
  • Building machine learning models using scikit-learn
  • Designing data pipelines

Portfolio Guide

Project Link Tools & Libraries Domain Methods Description
πŸš“πŸ•΅οΈ Dutch crime data: national, regional and urban trends Python (pandas, numpy, seaborn) Public admin Data storytelling Calculates, visualizes and draws conclusions on total and violent crime rates per 1000 people for different geographic levels of the Netherlands from 2012 - 2024
🏘️ Rental revenue prediction with machine learning Python (pandas, numpy, scikit-learn, seaborn) Real Estate Machine learning Predict the revenue of rental properties using feature selection and hyperparameter tuning for various machine learning models (in progress)
πŸ“¦ Northwind Traders inventory management with SQL PostgreSQL Inventory & Logistics Exploratory analysis A SQL script exploring and aggregating inventory and order data for a wholesale food company
πŸ“Š Best advertising markets for an e-learning app Python (pandas, numpy, seaborn) Marketing Exploratory analysis Python data exploration and visualization to find the best advertising markets for an e-learning platform
🌍 Company GHG emissions time series construction Python (pandas, numpy, matplotlib, scipy) Sustainability / ESG Time series analysis Python script to construct emissions pathways based on company emissions data

Pinned Loading

  1. chels-j chels-j Public

  2. ML-assignment ML-assignment Public

    Final assignment for Machine Learning class (block 4 2025, Tilburg University)

    Jupyter Notebook 1

  3. NorthwindTraders_SQL NorthwindTraders_SQL Public

    Exploration of business questions for a wholesale food company using PostgreSQL

  4. python-advertising-marketselection python-advertising-marketselection Public

    Python data exploration to find the two best markets for advertising a (fictional) e-learning platform

    Jupyter Notebook

  5. emissions-pathways emissions-pathways Public

    Python script to construct emissions pathways based on company emissions data

    Python

  6. EmployeeTurnover EmployeeTurnover Public

    Building a machine learning model to predict employee turnover

    Jupyter Notebook