Maryna

Maryna Kolisnichenko
[відкрити контакти](див. вище в блоці «контактна інформація») - [відкрити контакти](див. вище в блоці «контактна інформація») - Vyshneve, Kyiv, Ukraine. -
[відкрити контакти](див. вище в блоці «контактна інформація») - @Maryna_Kolis
Junior Data Analyst

SUMMARY
Junior Data Analyst with hands-on experience analyzing sales, revenue, and customer behavior data in an e-commerce environment. Skilled
in SQL, Power BI, Tableau, and Excel for transforming raw data into structured insights and interactive dashboards.
Experienced in revenue analysis, KPI tracking, refund rate calculation, and performance monitoring. Applied SQL aggregation, window
functions, and BI tools to evaluate business trends and support data-driven decision-making.
Strong analytical thinking, attention to detail, and ability to translate business questions into measurable metrics.
HARD SKILLS
SQL, Data Cleaning, Data Analysis, Data Visualization, KPI Tracking, Reporting, Trend Analysis, Revenue Analysis, Sales Analysis,
Pivot Tables, Lookups, DAX, Power Query
TOOLS
PostgreSQL, BigQuery, Power BI, Tableau, Excel, Google Sheets, Pandas, NumPy
WORK EXPERIENCE
Buyer | Sales & Customer Data Analysis
Self-employed | 2010 – Present
Analyzed order, revenue, and customer behavior data using Google Sheets to identify seasonal demand trends and support product
sourcing decisions.
Maintained and structured client and order datasets for efficient tracking, reporting, and performance monitoring.
Conducted revenue and refund analysis to evaluate product performance and optimize purchasing strategy.
Identified top-performing product categories and seasonal patterns through sales data analysis.
Created analytical reports to support operational and marketing decisions.
Designed promotional content (static and animated banners in Canva) and managed social media updates.
Key Achievements
Automated order tracking system in Google Sheets, improving reporting efficiency.
Built and maintained a loyal client base of returning customers through data-informed decision-making.
Delivered regular analytical reports based on order and customer data.
PROJECT EXPERIENCE
User Activity & Revenue Dashboard | Power BI
Tools: Power BI, DAX, Power Query
https://github.com/marusa07201/powerbi-user-activity-dashboard
Built an interactive dashboard to analyze user activity and revenue trends.
Created DAX measures for key KPIs (Total Revenue, Net Revenue).
Identified usage patterns to support business decision-making.
Superstore Sales Dashboard | Tableau
Tools: Tableau, Google Sheets, Excel
https://public.tableau.com/app/profile/maryna.kolisnichenko6018/viz/Project_2_17604718051330/Dashboard1
Built an interactive Tableau dashboard to analyze sales, profit, and delivery performance across regions and customer segments.
Conducted profitability and delivery time analysis using calculated fields and time-series visualizations.
Enabled performance monitoring through interactive filters and dynamic views.
Revenue Analysis Project | SQL
Tools: PostgreSQL, SQL
https://github.com/marusa07201/sql-revenue-analysis
Performed revenue and refund rate analysis using SQL.
Used window functions and CTEs to calculate revenue contribution.
Generated monthly revenue trends and running totals.
EDUCATION
IT School “GoIT” – Data Analysis (2025)
Kyiv National Economic University named after Vadym Hetman – Bachelor’s degree, Accounting and Auditing (2003–2011, with academic
leave for maternity)
LANGUAGES
English – Intermediate (B1)
Ukrainian - Native