Юліанна

YULIANNA PISKUNOVA
J U N I OR D A T A A N A L Y S T
Phone: [open contact info](look above in the "contact info" section)
Email: [open contact info](look above in the "contact info" section)

Location : Lviv, Ukraine
LinkedIn : [open contact info](look above in the "contact info" section)
piskunova-822808397

SUMMARY
Junior Data Analyst with hands-on experience in data analysis and visualization. Skilled in
Python (pandas, numpy), SQL, Tableau, and Excel. Proficient in data cleaning, exploratory
data analysis, A/B testing, and creating interactive dashboards. Passionate about
transforming raw data into clear, actionable insights that support business decisions. Eager
to bring analytical skills to a dynamic team and continue professional growth.

SKILLS
Data Cleaning and Wrangling
Statistical Analysis
A/B Testing
Cohort Analysis
Data Visualization and Storytelling
Problem Solving and Critical Thinking
Attention to Detail
TOOLS
Python - pandas, numpy, matplotlib, seaborn
SQL - PostgreSQL
Tableau
Google Sheets
Git & GitHub
Big Query
Jupiter Notebook
PROJECT EXPERIENCE
Stack Overflow Developer Survey Analysis
Performed end-to-end analysis of the 2023 Stack Overflow Developer Survey (49k+ responses) using Python (pandas,
numpy, matplotlib, seaborn). Conducted data cleaning, exploratory data analysis, calculated key metrics, and created
visualizations. The project focused on identifying trends in programming languages adoption, compensation factors, and
developer experience. Demonstrated strong skills in data wrangling, analysis, and insight generation.
Link : https://colab.research.google.com/drive/13lPR41VV0Th0q424VzF_tsYwGMAJBP-F?usp=sharing

User Retention & Cohort Analysis
Performed cohort analysis to measure user retention rates using SQL and Google Sheets. Analyzed user behavior by
cohorts based on the first activity month, calculated Day 1, Day 7, and Day 30 retention metrics, built retention curves, and
identified key engagement trends over time.
Technologies: SQL (PostgreSQL), Google Sheets
Links: Google Sheets Dashboard : https://docs.google.com/spreadsheets/d/1RLCU3Gy5peSIYB-1lCP2SwzIlb-
cVbdwKyPbj2kBCho/edit?usp=sharing
SQL Script : https://s3.eu-north-1.amazonaws.com/lms.goit.files/412f81b5-cb78-44ba-928f-436819db9009Script-15.sql
EDUCATION
Uzhorod National University | 2023- present (Expected graduation: 2026)
Bachelor of Psychology
It School “Go IT” | 2025-2026

Data Analysis
LANGUAGES
English - Upper-Intermediate
Ukrainian - Native