Артём Олефиренко

Data Analyst

SalesIntel•  August 2022 - Present

• Data analysis and management, preparation for business users; • Data research and providing results to clients; • Ad-hoc queries compilation for data extraction; • Dataset composition for further application of data quality rules and DB cleanup; • Query composition, data enrichment via SQL, Python. Personal results: • Performed DB cleanup from incorrect data based on the request. Designed the rules for invalid data determination and purge. Increased data quality by 10%. • Developed an algorithm that allowed to speed up the incoming data processing and increase the quality by 30%.

Data Quality Analyst

OZON.ru•  November 2021 - December 2022

• Data quality automated checks development and implementation; • Data analysis and management, preparation for business users; • Backend development of data quality checking tool for internal users (python based); • Team backlog management. Personal results: • Implemented automatic data quality service that allowed to highlight corruption and inconsistency in data for financial department, which brought the time of financial report delivery down from 3 weeks to 1; • Designed a service for business users that allowed them to compile simple data quality checks on their own, which raised awareness level from 10% to 35% (according to the internal survey) and allowed financial department to narrow the difference between the reports by 0,3% (according to a retrospective analysis of the reports before and after service release).

Data Quality Analyst

X5 Group•  February 2021 - November 2021

• Data stewarding logistics division with ERP master data; • Creating simple views and tables from multiple sources and managing their pipelines; • Monitoring data quality in DWH and Data Lake based on ERP MD; • Implementation of data quality checks. Personal results: • Implemented DQ system that allowed to bring down the time of error detection various layers from 1-2 days to couple of hours.