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tsuijonathan/README.md

Hi, I'm Jonathan Tsui

Data Analyst | From Toronto, Canada | Based in Madrid

Welcome to my GitHub! I help SaaS and data-driven teams turn technical user, product, and marketing data into decision-ready insights that drive growth, retention, and efficiency. By leveraging Python, SQL, Excel, and BI tools, I deliver reports with recommendations that define the right metrics, improve decision-making, and create measurable business value.


About Me

My career path has been unconventional, spanning teaching, culinary leadership, and podcasting across Canada, Japan, Thailand, and now Madrid. At every stage, data, efficiency, and storytelling have been my constants. These experiences shaped my adaptability and ability to communicate insights clearly to both technical and non-technical stakeholders.

At Tradler, I broke into analytics and quickly grew by applying the same grit and discipline I honed as a chef. I thrive in fast-moving, quick-pivoting environments where I can keep learning, deliver value, and get the job done.

Focus areas

Product analytics: KPIs, OKRs, cohort analysis, lifecycle, funnels, conversion, retention/churn

Experimentation: hypothesis testing, A/B testing, causal/statistical modeling

BI & reporting: Tableau, Looker Studio, Grafana, dashboard automation, executive-ready reporting

Marketing analytics: GA4, Google Tag Manager, LinkedIn Ads, Meta Ads, Google Ads, attribution, ROI, lead funnels

Communication: data storytelling for technical and non-technical audiences

Tech stack: SQL, Python, Excel/Sheets

AI-integrated Workflow: I use AI to speed analysis, validate SQL/Python, automate data cleaning, and produce concise stakeholder summaries.


My Projects

Here are a few projects that showcase my skills:

  • Bakery Sales Analysis
    Analyzed sales data of a bakery to enhance revenue and efficiency. Delivered actionable insights using BI techniques, KPIs, and dashboards.

  • Vanguard A/B Testing
    Evaluated the impact of UI changes on user experience and completion rates. Conducted EDA, calculated KPI's, hypothesis testing, and created dashboards to visualize key findings.


Technologies & Tools

Python
Scikit-learn
Pandas
NumPy
Matplotlib
Seaborn
Plotly
Tableau
SQL
Jupyter
VS Code


Let's Connect!

I'm actively seeking a remote data analytics role where I can apply my technical skills and global perspective to drive impactful solutions. If you’d like to collaborate or discuss opportunities, feel free to reach out:


Fun Fact

I trained for and completed my first marathon (42.2 km in 3:54) within a year of starting running and while caring for my young son—proof that I thrive under pressure and love tackling challenges!

Pinned Loading

  1. bakery_sales_analysis bakery_sales_analysis Public

    Jupyter Notebook

  2. vanguard-ab-test vanguard-ab-test Public

    Forked from najafriederike/vanguard-ab-test

    Jupyter Notebook