Олександр
Data analyst
- Considering positions:
- Data analyst, Дата-аналітик, Аналітик
- Age:
- 21 years
- City of residence:
- Ternopil
- Ready to work:
- Remote
Contact information
The job seeker has entered a phone number and email.
Name, contacts and photo are only available to registered employers. To access the candidates' personal information, log in as an employer or sign up.
You can get this candidate's contact information from https://www.work.ua/resumes/17555094/
Work experience
Data analyst
from 01.2026 to now
(4 months)
Remote Helpers, Дистанційно (Пошук персоналу, HR)
Cohort analysis of user retention and optimization of marketing
strategy
Technical implementation:
Data processing: Implemented raw transaction data cleaning in
Python/Pandas, duplicate processing, and type conversion. Used the
pandas method’s to segment users by date of first purchase.
Complex calculations: Optimized the calculation of customer
lifetime through Pandas vector operations, which accelerated data
processing by 5 times compared to loops.
Visualization: Built a retention matrix and visualized it as a heat
map with color coding for quick detection of anomalies in cohort
behavior.
Analytical implementation:
Conducted a cohort analysis, revealing a twofold difference in
retention rates between the January (36%) and July (18%) cohorts.
Identified a downward trend in the retention of older customers, which
allowed us to formulate hypotheses about low traffic quality and
seasonal shortages of goods.
Education
Тернопільський Національний Університет ім. Івана Пулюя
Автоматизація і комп'ютерно-інтегровані технології, Тернопіль
Higher, from 2021 to 2025 (4 years)
Additional education and certificates
Data cleaning
2025, 2 місяці
Data visualization
2025, 3 місяці
Excel course
2025, 2 місяці
SQL, SQLAcademy
2024, 1 рік
Python
2024, 2 роки
Knowledge and skills
- MS Excel
- SQL
- MySQL
- PostgreSQL
- Python
- NumPy
- Pandas
- SciPy
- Statistics
- Tableau
- MS Power BI
- Google Sheets
- Google Analytics 4
- Financial analysis
- Sales analysis
- Стресостійкість
- Адаптивність
- Комунікабельність
- Quick learner
- Jira
Language proficiencies
- English — above average
- Ukrainian — fluent
More resumes of this candidate
Considering positions: Дата-аналітик, Аналітик продажу, Аналітик, 2 more positions
Remote
Oleksandr Romanyshyn Data analyst, Product analyst Ternopil, Ukraine Summary Junior Data analyst with hands-on experience in Python, Pandas, and SQL for data analysis and manipulation. Solid...
Similar candidates
-
Аналітик
25000 UAH, Remote -
Аналітик консолідованої інформації
Remote -
Менеджер інтернет-магазину, аналітик з продажів
25000 UAH, Remote, Dnipro -
Аналітик
Remote -
VBA developer, Data Analyst
Remote -
Data analyst
Remote, Kyiv