Hi, my name is
Vusumuzi Nkosi.
Data Scientist.
I'm a data science postgraduate student at STADIO and ALX Data Science graduate, specializing in Python, SQL, machine learning, and data visualisation. I turn complex datasets into insights that drive decisions.
Check out my work!01. About Me
Hello! I'm Vusumuzi, a data science postgraduate student at STADIO (NQF 8) and ALX Data Science programme graduate. I spent 9+ years as a mathematics lecturer, which gave me something most data professionals don't have: the ability to break down complex quantitative concepts and communicate them clearly to any audience.
That skill translates directly into translating data into stories that drive decisions. I build machine learning models, write SQL queries, create dashboards, and enjoy the challenge of finding meaningful patterns in messy data.
Here are a few technologies I've been working with recently:
- Python (Pandas, NumPy, scikit-learn)
- SQL (MySQL, PostgreSQL)
- Machine Learning (XGBoost, SMOTE)
- Power BI & Excel
- Matplotlib & Seaborn
- Data Visualisation
02. Where I've Worked
Senior Lecturer — Mathematics & IT
Amajuba TVET College · Newcastle, KwaZulu-Natal
Feb 2017 — Present
- Deliver mathematics and IT instruction to 100+ students annually across multiple cohorts, designing curriculum and assessments aligned with national standards.
- Analyse student performance data to identify at-risk learners and adjust teaching strategies — improved pass rates through targeted, data-driven interventions.
- Developed standardised assessment rubrics adopted across the mathematics department for consistent grading.
- Mentored students in IT competitions at regional and national level, with multiple teams advancing to national rounds.
Special Educator — Mathematics
Mdumiseni High School · KwaZulu-Natal
Jan 2012 — Mar 2016
- Delivered mathematics lessons for diverse learner groups, tracking individual progress and adapting materials to different learning needs.
Certifications & Education
- Postgraduate Diploma in Data Science (NQF 8)STADIO · In Progress
- BSc Mathematics & Computer ScienceUNISA · 2022–2025
- ALX Data Science ProgrammeALX Africa · 2025–2026
- Data Analyst CertificateALX Africa · 2025
- AI Engineering BootcampZero To Mastery · 2025
03. Some Things I've Built
Featured Project
Lending Club Loan Default Analysis
End-to-end credit risk pipeline on 2.26M real Lending Club loans (2007–2018). SQL schema design, 151→33 feature cleaning, full EDA, Gradient Boosting model (AUC 0.72), and ~$95M/year in quantified preventable losses. Includes an interactive Streamlit app for live predictions.
- Python
- SQL
- scikit-learn
- Streamlit
- Plotly
Featured Project
US Household Income SQL Analysis
Comprehensive SQL analysis of US household income data, exploring geographic patterns, demographic trends, and economic disparities across states and counties using window functions, CTEs, and data aggregation.
- SQL
- MySQL
- Data Analysis
- Geographic Data
Featured Project
World Life Expectancy SQL Analysis
In-depth SQL analysis of global life expectancy data, examining trends over time, correlations with economic indicators, and identifying factors affecting longevity across different countries using advanced analytical techniques.
- SQL
- MySQL
- Time Series Analysis
- Global Data
Featured Project
Sales Performance Dashboard & Analysis
Excel-based sales performance analysis with interactive dashboards, trend identification, and business insights. Covers data cleaning, pivot tables, conditional formatting, and visual reporting for sales metrics.
- Excel
- Pivot Tables
- Data Visualisation
- Business Analytics
04. What's Next?
Get In Touch
I'm looking for data science, data analyst, or machine learning roles in South Africa (open to remote too). Whether you have an opportunity, a question about my work, or just want to connect — I'd love to hear from you.
Say Hello