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Macharia Hellen25

@machariahellen25

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Data cleaning and validation analyst working with Python and Excel; cleaned and checked a café sales dataset.

Kenya

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What I'm looking for

I'm looking for entry-level and freelance opportunities where I can help clients clean, validate, and prepare data for analysis.

On my Café Sales Data Cleaning and Analysis project, I worked with a dataset containing missing values and inconsistent records. I inspected its structure and investigated data-quality issues before cleaning it.

After cleaning, I performed validation checks and compared the data before and after the work. I also documented issues I couldn't confidently resolve and used the cleaned dataset to explore sales and revenue patterns.

I'm currently pursuing a Bachelor of Science in Data Science at KCA University and have completed the CPA Foundation Level through KASNEB. I use Python, Pandas, NumPy, Excel, Matplotlib, Jupyter, Google Colab, and GitHub.

Experience

Work history, roles, and key accomplishments

Data Cleaning and Validation

Café Sales Project

Worked on a café sales dataset, identifying and resolving data quality issues such as missing values, duplicates, and inconsistent categories. Performed validation checks and documented unresolved issues.