Maryna

Maryna Kolisnichenko
[open contact info](look above in the "contact info" section) - [open contact info](look above in the "contact info" section) - Vyshneve, Kyiv, Ukraine. -
[open contact info](look above in the "contact info" section) - @Maryna_Kolis
Data Analyst
SUMMARY
Junior Data Analyst with 15 years of experience working with data and optimizing business processes in e-commerce. Regularly works with
order and sales data: maintaining records, tracking statuses, preparing reports in Google Sheets, and optimizing reporting processes by
creating clear and efficient tables. Currently developing technical skills in SQL (PostgreSQL, BigQuery), Python, Power BI, Tableau, Looker
Studio, Data Visualization, and A/B Testing. Detail-oriented, systematic, and focused on improving processes through data-driven decisions.
HARD SKILLS
Python, SQL, Data Analytics, Data Cleaning, Data Visualization, A/B Testing, ETL (Extract, Transform, Load), Business Analytics,
Reporting, Trend Analysis, Sales Analysis, Financial Analysis (P&L)
TOOLS
PostgreSQL, BigQuery, Pandas, NumPy, Power BI, Tableau, Looker Studio, Google Sheets, Excel.
WORK EXPERIENCE
Buyer | Data Analysis of Sales & Market Trends
Self-employed | 2010 – Present
Analyzed sales data and seasonal demand trends using Google Sheets and Excel, improving product recommendations and stock
planning.
Maintained and optimized client and order database, enabling 30% faster access to order status and reports.
Tracked profit and expenses (P&L analysis), supporting sourcing and logistics decisions.
Conducted sales analytics to identify top-performing products and seasonal patterns, supporting marketing strategy.
Designed promotional content (static and animated banners in Canva) and managed social media updates.
Key Achievements
Automated order tracking in Google Sheets, reducing processing time by 30%.
Built a loyal client base of 2,000+ returning customers.
Delivered 1,500+ reports and testimonials, increasing customer trust.
PROJECT EXPERIENCE
Ad Campaign Performance Analysis | Junior Data Analyst
Tools: SQL, Google Sheets / Excel
https://github.com/marusa07201/GA4_Project1
Collected and integrated advertising data from Facebook Ads and Google Ads daily tables, joining campaign and adset information
using SQL queries and joins.
Calculated key metrics: spend, impressions, reach, clicks, leads, revenue per campaign and adset.
Analyzed performance trends to identify high-performing campaigns and adsets, providing insights for budget optimization and
targeting strategies.
Prepared summarized reports and pivot tables in Google Sheets to visualize trends and support data-driven decision-making.
Superstore Sales Dashboard | Junior Data Analyst
Tools: Tableau, Google Sheets, Excel
https://public.tableau.com/app/profile/maryna.kolisnichenko6018/viz/Project_2_17604718051330/Dashboard1
Built an interactive dashboard in Tableau to analyze sales, profit, and delivery performance based on the Superstore Sales dataset.
Created a time series of sales and profit (2020–2023) using dual-axis visualization, enabling trend analysis and comparison by Ship
Mode and Segment.
Performed profitability analysis by subcategory and shipping method, applying calculated fields and conditional color scales for
visual insights.
Calculated delivery time metrics using Order Date and Ship Date, visualized average delivery duration by U.S. state on a map
dashboard.
Implemented interactive filters, parameters, and actions to enhance user experience and enable flexible data exploration.
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
Ukrainian - Native