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Stas Leontij

@stasleontij

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Data Analyst at DataAnalyst-HayCredito who cut report generation time by 40% through PostgreSQL query optimization.

France

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At DataAnalyst-HayCredito, I optimized PostgreSQL queries across fragmented data sources, reducing report generation time by 40%. I analyzed thousands of daily transactions and automated SQL reporting for productivity, KPIs, and target attainment.

At Resolv, I analyzed operational workflows, built SQL reports and KPI dashboards, and defined validation rules for AI and workflow automation projects. Previously at Umbra, I monitored crypto market data, reported anomalies, and turned market movements into product insights.

Experience

Work history, roles, and key accomplishments

Data Analyst

HayCredito

Oct 2025 - Aug 2026 (10 months)

Optimized PostgreSQL queries across fragmented data sources, reducing report generation time by 40%. Analyzed 4,000–5,000+ daily transactions and automated SQL reporting for productivity, KPIs, and target attainment.

PostgreSQL SQL Query Optimization Data Validation KPI Reporting Automation

Business Intelligence & Automation Analyst

Resolv

Jan 2026 - Jul 2026 (6 months)

Analyzed business workflows and operational data to identify bottlenecks and automation opportunities. Built SQL-based reports and dashboards to track KPIs, exceptions, and process performance.

SQL Data Analysis KPI Dashboards Process Automation CRM ERP Data Validation

Data Analyst & Engineer

Umbra

Nov 2023 - Sep 2025 (1 year 10 months)

Monitored real-time crypto market databases, validating continuously changing prices, spreads, and funding rates while identifying and reporting data anomalies. Transformed crypto market data into actionable product insights.

Data Analysis Data Validation Crypto Markets Anomaly Detection Reporting Product Insights