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I'm Yohan Medalsy, a Senior Data Scientist and independent AI consultant with 8+ years across gaming, marketing technology, and asset management. I've built production ML systems and measurement frameworks that drive growth, including ~25% ROAS uplift via MMM and retention improvements through churn modeling. I have a strong background in statistics, time-series, optimization, and reinforcement learning, delivering solutions with Spark/Databricks/Airflow/AWS and modern data stacks. I enjoy turning data into business value and collaborating across teams to ship impact at scale.…I'm Yohan Medalsy, a Senior Data Scientist and independent AI consultant with 8+ years across gaming, marketing technology, and asset management. I've built production ML systems and measurement frameworks that drive growth, including ~25% ROAS uplift via MMM and retention improvements through churn modeling. I have a strong background in statistics, time-series, optimization, and reinforcement learning, delivering solutions with Spark/Databricks/Airflow/AWS and modern data stacks. I enjoy turning data into business value and collaborating across teams to ship impact at scale.

Yohan Medalsy

Data Scientist, AI Engineer, Growth Marketer, +2

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I'm Yohan Medalsy, a Senior Data Scientist and independent AI consultant with 8+ years across gaming, marketing technology, and asset management. I've built production ML systems and measurement frameworks that drive growth, including ~25% ROAS uplift via MMM and retention improvements through churn modeling. I have a strong background in statistics, time-series, optimization, and reinforcement learning, delivering solutions with Spark/Databricks/Airflow/AWS and modern data stacks. I enjoy turning data into business value and collaborating across teams to ship impact at scale.…I'm Yohan Medalsy, a Senior Data Scientist and independent AI consultant with 8+ years across gaming, marketing technology, and asset management. I've built production ML systems and measurement frameworks that drive growth, including ~25% ROAS uplift via MMM and retention improvements through churn modeling. I have a strong background in statistics, time-series, optimization, and reinforcement learning, delivering solutions with Spark/Databricks/Airflow/AWS and modern data stacks. I enjoy turning data into business value and collaborating across teams to ship impact at scale.

Available to hire

I’m Yohan Medalsy, a Senior Data Scientist and independent AI consultant with 8+ years across gaming, marketing technology, and asset management. I’ve built production ML systems and measurement frameworks that drive growth, including ~25% ROAS uplift via MMM and retention improvements through churn modeling.

I have a strong background in statistics, time-series, optimization, and reinforcement learning, delivering solutions with Spark/Databricks/Airflow/AWS and modern data stacks. I enjoy turning data into business value and collaborating across teams to ship impact at scale.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

Hebrew (modern)

Advanced

English

Fluent

French

Fluent

Work Experience

Independent AI Consultant at Independent AI Consultant

May 1, 2025 - Present

Providing end-to-end ML/AI solutions for multiple clients: developing contextual bandit system for game monetization; building LTV forecasting and ROI-driven decisions; designing agentic content workflows and an AI ghostwriter for social posts; prototyping and backtesting a quant trading algorithm.

Senior Data Scientist at Huuuge Games

May 1, 2021 - March 1, 2025

Led end-to-end data science initiatives for Huuuge Casino and Marketing; built production ML/AI pipelines (Python, Spark/Databricks) for marketing decisioning; owned MMM pipeline driving ~25% ROAS uplift; developed embedding-based look-alike targeting and propensity/LTV scoring; improved UA efficiency; built churn/disengagement prediction; improved D7/D30 retention; productionized pipelines with Databricks, Airflow, monitoring, and documentation.

Data Science Tech Lead at Imprint Social

February 1, 2020 - April 1, 2021

Led AI/Data Science across R&D and business stakeholders; built NLP classification pipeline for X (Twitter) to identify high-impact posts and micro-influencers; hired and mentored Data Scientists; established best practices for experiment design, offline metrics, and launch readiness.

Quantitative Analyst at Asset Management

May 1, 2016 - April 1, 2018

Managed global quantitative equity strategies (~$3M AUM) delivering ~20% annualized returns (net of fees) with ~5% max drawdown and Sharpe ~3.4; created a second Israeli-market strategy (~$8M AUM) delivering ~15% annualized returns with ~8% max drawdown and Sharpe ~3.1; automated fund and back-office workflows in VBA; produced risk analytics and supported derivative pricing.