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Sergei Tsereshko

@serg_tser

Data Scientist with 4+ years building credit scoring and automated decisioning systems. Python, SQL, CatBoost, PySpark. Remote from Serbia.

Serbia

Message

What I'm looking for

Looking for a fully remote Data Scientist role in product, technology or fintech company. I have 4+ years of experience building and deploying credit scoring and decisioning solutions end to end, including feature generation, A/B testing, production monitoring and portfolio risk analytics. I’m based in Serbia (CET/CEST) and open to full-time roles and long-term contracts.

I’m a Data Scientist with 4+ years of experience. My current work focuses on credit risk, lending analytics, and automated decisioning, including building and monitoring credit scoring models, developing risk rules, and running experiments to improve model quality and business performance. My core tools include Python, SQL, CatBoost, PySpark, and Airflow.

Experience

Work history, roles, and key accomplishments

Current

Data Scientist

Current

Robofinance

Jun 2024 - Present (2 years 2 months)

Built e2e credit scoring models improving Gini by 8 pp and reducing 5+ DPD by 2 pp at a stable approval rate. Generated 8,000+ credit-history features. A mobile-data model cut 15+ DPD by 4 pp. Built auto-approval/decline rules using credit bureau, anti-fraud and external data, raising approval by 4 pp without increasing 5+ DPD. Automated model monitoring with Airflow and optimized risk rules.

Data Scientist

Money Kapital

May 2022 - Jun 2024 (2 years 1 month)

Developed an end-to-end credit scoring model with Gini above 0.60. Implemented CatBoost, improving Gini by 7 pp. A/B tested decision thresholds and selected a configuration that increased profit by 1.5% without raising defaults. Helped automate loan decisions, reducing processing time by 13%.