Aleksandr Demidenkov

Senior Data Engineer working on enterprise Data Warehouse modernization and operations. Snowflake/dbt migration (10+ dbt models, tests, docs), reducing incremental pipeline runtime from ~30 min (SSIS) to ~3 min on a 100B+ row dataset. SQL Server performance tuning (3–10x improvements). Maintaining metadata-driven DWH (SQL Server, SSIS), resolving 300+ production tickets, ETL failures, data quality issues, and controlled reprocessing under SLA. Tech: SQL Server, T-SQL, SSIS, Snowflake, dbt, BIML, Kafka, Git.

Senior Data Engineer building and operating analytics DWH platforms. Designed ClickHouse analytics cluster (2 shards × 2 replicas) and Apache Airflow orchestration (~50 production DAGs) powering data marts up to ~500M rows and automated reporting for analysts and executives. Optimized complex ClickHouse queries (20–30 min → 3–5 min). Built Python internal tools (Flask, Celery, Redis) and GitLab CI/CD pipelines for Airflow deployments. Tech: ClickHouse, Airflow, Python, SQL, Docker, GitLab CI/CD, Linux.

Senior Data Analyst responsible for B2B KPI monitoring, forecasting models and management reporting. Built financial models and analytical reports for lending, fundraising and product sales performance. Coordinated implementation of loan cost calculation logic in internal IT systems with development teams and mentored analytics specialists. Developed an Excel-VBA and SQL-based system to forecast cash demand for ~1000 ATMs, increased planner productivity by ~5x and reduced cash-out incidents.