Денис

Diemientov Denys
DATA ANALYST

CONTACTS PROFILE
[відкрити контакти](див. вище в блоці «контактна інформація») Data Analyst with strong SQL background and hands-on experience
working with transactional data in fintech environment. Experienced in
[відкрити контакти](див. вище в блоці «контактна інформація»)
data extraction, analysis, and reporting to support operational and business
LinkedIn decisions.
Skilled in analyzing payment flows, identifying anomalies, and optimizing
Telegram data processes. Solid understanding of transaction lifecycle (authorization,
Kyiv, Ukraine clearing, settlement) and experience working with large datasets. Currently
focused on developing expertise in data visualization and business
TECHNICAL SKILLS analytics.

SQL: advanced queries, CTE, WORK EXPERIENCE
window functions, aggregations,
Oschadbank
performance optimization
Head of Technical Monitoring
Databases: Oracle, Department | Apr 2026 - Present
PostgreSQL(basic) Lead daily operations of Technical Monitoring Department and team
coordination.
Data Analysis: data extraction,
Manage monitoring processes, incident response flow, and
cleaning, transformation, escalation procedures.
validation Analyzed transaction data and payment flows to identify anomalies
and operational issues
Excel / Google Sheets: advanced Developed and optimized complex SQL queries for reporting and
formulas, pivot tables data analysis
Investigated transaction lifecycle (authorization, clearing, settlement)
Data Visualization: Looker Studio using data analysis
(basic), Tableau (basic) Identified patterns and root causes of failures based on data insights
Collaborated with technical teams to resolve data-related issues
Monitoring & Analytics Tools:
Deputy Head of Technical Monitoring
Grafana Department | May 2025 - Apr 2026
Other: DBeaver, Toad Supervised monitoring operations and task execution within
department.
CORE Coordinated incident handling and communication between
COMPETENCIES technical teams.
Supported reporting processes and data validation
Data Analysis & Interpretation Improved data accuracy and reporting workflows

SQL Data Processing Chief Engineer, Technical Monitoring
Department | Sept 2022 - May 2025
Data Cleaning & Transformation
Monitored transaction systems, payment flows, and infrastructure
Analytical Thinking alerts.
Reporting & Dashboarding Investigated incidents, processing failures, and root causes.
Worked with SQL queries for operational analytics and reporting.
Business Data Analysis Performed data analysis of system events and transaction logs
Anomaly Detection Supported reporting and monitoring dashboards
Supported Visa / MasterCard related operational requests and
Process Optimization
transaction issues.
Data-driven Decision Support
Stakeholder Communication
SOFT SKILLS
EDUCATION
Analytical Thinking 2017 - 2021
National Academy of the
Problem Solving Security Service of Ukraine
Attention to Detail Bachelor’s Degree in Cybersecurity
Communication Skills
Responsibility & Ownership
Adaptability
Prioritization

LANGUAGES
English - Intermediate
Ukrainian - Native