Aleksandr Ovchinnikov
@aleksandrovchinnikov1
Data/BI Analyst: SQL data marts on PostgreSQL, DataLens dashboards, data quality checks. AI-augmented (Claude Code). Belgrade, open to remote.
SerbiaWhat I'm looking for
Data analyst since 02/2023: Yandex Travel, then 100points (EdTech, exam prep). I build SQL data marts on a ~2 TB PostgreSQL warehouse and Yandex DataLens dashboards used by 30–50 people, and I make the numbers match the source: SQL controls, reconciliation, automated checks. I work with AI agents (Claude Code, Codex); the logic and the verification are my responsibility.
At 100points I recomputed the LTV of two payment options at person-course grain: the old estimate compared buy-out with students who finished, my result reversed it and the Head of Finance accepted it. At Yandex Travel I cut payment-reconciliation discrepancies from 3.2% to 0.6% with SQL controls and a dedicated data mart.
Based in Belgrade (CET), Serbian permanent resident with full right to work in Serbia. English: B1 (CEFR), ready to improve it on the job.
Experience
Work history, roles, and key accomplishments
BI / Data Analyst
100points
Nov 2025 - Present (1 year)
Moved reporting from Power BI and Google Sheets into unified SQL data marts and DataLens dashboards on a ~2 TB PostgreSQL warehouse. Built automated checks and analytics for LLM-based homework grading, LTV, and student retention.
Data Analyst
Yandex Travel
Feb 2023 - Nov 2025 (2 years 9 months)
Built data marts and reporting in SQL/YQL for orders, commissions, and payouts. Reduced payment-reconciliation discrepancies from 3.2% to 0.6% and improved SLA visibility with dashboards and alerts.
Education
Degrees, certifications, and relevant coursework
Karpov.courses
Data Analyst program, Data Analysis
2025 - 2025
Completed the Data Analyst program in 2025.
Yandex Practicum
Data Analyst program, Data Analysis
2023 - 2023
Completed the Data Analyst program in 2023.
National Open Institute of Russia
Coursework, no degree, Applied Informatics
Completed coursework in Applied Informatics without earning a degree.
ITMO University
Coursework, no degree, Photonics & Optoinformatics
Completed coursework in Photonics and Optoinformatics without earning a degree.
Tech stack
Software and tools used professionally
Availability
Location
SerbiaAuthorized to work in
Salary expectations
Job categories
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