University of Wales

Kostanay State University named after Akhmet Baitursynov

Data Scientist at Liftoff

- Contributed to dynamic throttling model development, reducing serving costs by 70%.
- Developed a Python-based Bayesian A/B testing framework for unevenly allocated experiments.
- Implemented new features for Neural Network market price model, increasing revenue by 1.5%.
- Migrated market price model's ETL from Amazon Athena to Iceberg in Data Lake.
- Helped develop impression-to-click model, replacing primary impression-to-install model for Apple SKAN traffic.

Liftoff Mobile

Senior Data Scientist

- Managed development of a Neural Network model that predicted ad auction market price values, improving bid shading quality and increasing revenue by 10%.
- Collaborated with a team of four Data Scientists.
- Contributed to data preparation, feature engineering, code review, and performance analysis.
- Managed project timeline, resources, and reported results to leadership.

Data Science Product Manager

- Developed an ML model that improved main model's prediction accuracy, boosting annual net revenue by 3% (millions of dollars).
- Created a Python library for Synthetic Difference-in-Differences causal inference analysis, now used by multiple teams to quantify experiment outcomes when A/B testing is inapplicable.
- Designed a methodology to evenly partition test units across groups, ensuring parity in key metrics like revenue, views, users, and CTR, without costly simulations, handling thousands of units.
- Contributed to ML-powered recommendation system utilizing similarities among video ad attributes (mood, primary character, action level) to match candidates.
- Participated in video taxonomy project using AI and computer vision to convert video ads into structured data.
- Developed ETL pipelines using Python and Spark to collect and analyze multi-source, multi-format data (data lake, SQL databases, AWS S3 parquet files, JSON, vendor logs).

Data Scientist

- Developed new pre-filtering rules which reduced recommendation system candidate pool from 10k to under 1k, cutting serving costs by 50%.
- Discovered the bug impacting banners performance - the fix led to a 20% revenue lift. 
- Communicated analytical findings to the leadership team, translating complex data into clear and actionable insights.
- Executed dozens of multivariate and conventional A/B tests.
- Employed robust statistical techniques pre- and post-experiment to validate the reliability and integrity of test results.
- Built ML models including XGBoost and neural nets to demonstrate predictive power of diverse ad attributes like game genre, character persona, ad duration, and more.
- Conducted time-series analyses with Facebook Prophet and Google Causal Impact libraries in R and Python.
- Created and maintained version-controlled LookML models. Built dashboards in Looker.

Senior Product Analyst

- Managed fund's US business.
- Managed venture deals from scouting to investment.

Unlimited Capital

Partner

Ascape VR was the leading supplier of immersive travel content for brands like Marriott, JetBlue, Lonely Planet, Yellow Pages, Thomas Cook, and Amadeus. Ascape VR mobile app was installed by over a million users globally.

- Managed the team of 8. Led product design and development, product analytics, and user acquisition. 
- Achieved over a million installs on iOS and Android. 
- Increased paying users rate from an industry average of 1.2% to 7.5%. 
- Received the 'Most Innovative Android App' award from Google Play Store in 2017.
- My day-to-day job included user engagement analytics, features A/B testing, product features planning and forecasting.

Ascape VR

Founder

- Performed product analytics tasks covering user acquisition, retention, and growth rates. Conducted high-level financial forecasting. 
- Tracked the performance of the portfolio companies. Built dashboards in Tableau.

Venture Analyst

- Performed financial analysis and modeling on real estate investment opportunities across Europe.
- My analytical reports were often published in Forbes Kazakhstan and other finance-related media.

Valeriy Kondruk