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OLENA DZIUBA
Data Analyst

CONTACT SUMMARY
Data Analyst with hands-on experience in SQL, Python, and data
[открыть контакты](см. выше в блоке «контактная информация»)
visualization. Completed multiple end-to-end analytical projects,
[открыть контакты](см. выше в блоке «контактная информация») including e-commerce user behavior analysis in BigQuery and multi-
Telegram year sales analytics using Python. Strong background in data cleaning,
exploratory data analysis, statistical testing, and transforming complex
Olena Dziuba
datasets into clear business insights. Academic background in applied
GitHub linguistics and NLP supports structured thinking and work with large
Lviv, Ukraine / remote volumes of information. Advanced English and Upper-Intermediate
Polish enable effective communication in international environments.

SKILLS EXPERIENCE
Spreadsheets: Pivot Tables, Data Data Analyst (Independent Projects) July 2025 – Present
Cleaning, Visualization Conducted end-to-end data analysis projects, including data
SQL: Advanced Queries, Window extraction, cleaning, transformation, analysis, and visualization using
Functions, Query Optimization, SQL, Python, and Tableau.
Worked with real-world datasets related to e-commerce, sales, user
Common Table Expressions (CTE) behavior, and A/B testing to generate actionable business insights.
Python: Pandas, NumPy, Matplotlib, Applied statistical methods to evaluate hypotheses, measure
Seaborn, Scikit-learn, Exploratory conversion rates, and assess experiment results.
Built interactive dashboards and analytical reports.
Data Analysis (EDA), NLP libraries
Tableau: Interactive Dashboards, Key Projects:
Data Storytelling, Publishing E-commerce User & Email Analytics (SQL, BigQuery) — GitHub
Analyzed user account creation and email engagement data using
Statistics: Sampling, Hypothesis
advanced SQL in BigQuery to identify behavioral patterns and rank
Testing, Correlation, Statistical top-performing countries for business insights.
Significance Global Sales Analytics (Python) — GitHub
A/B Testing: Planning, Analysis, Conducted end-to-end analysis of multi-year global sales data in
Python, uncovering trends in revenue, profitability, and sales
Reporting
performance across products, regions, and channels.
Other Tools: Excel, R (basic Creating an A/B Testing Tool (Python, Tableau) — GitHub
knowledge) Conducted A/B testing using statistical methods in Python and built
Agile Methodologies: Scrum, Tableau dashboards to visualize key conversion metrics.
E-commerce User Sessions, Sales, and Conversion Analysis
Kanban
(Python, Tableau) — GitHub
Languages: English (Advanced), Performed analysis of e-commerce sales and user behavior to
Polish (Upper-Intermediate) identify key revenue drivers and performance patterns.

EDUCATION PREVIOUS EXPERIENCE
2020 - 2025 English Tutor Sep 2022 – Dec 2025
Lviv Polytechnic National University
Taught English to individuals and groups, both online and offline.
Master’s Degree in Applied Adapted teaching methods to individual learning styles, improving
Linguistics (with honors) English proficiency and maintaining long-term student engagement.
ACHIEVEMENTS ADDITIONAL EDUCATION

Authored a research article Data Analyst course at Mate academy
applying quantitative and Certificate
statistical analysis to textual
data, exploring linguistic metrics Natural Language Processing (NLP) (Online Courses in Digital
and distribution patterns in a Ukrainian Philology — Network for Ukrainian Studies Jena)
literary corpus. Certificate
Built and evaluated machine-
learning models for text Mathematical & Computational Linguistics (Online Courses in
classification and sentiment Digital Ukrainian Philology — Network for Ukrainian Studies Jena)
analysis using Python. Certificate