Oleksandr Karpenko, Developer in Amsterdam, Netherlands
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Oleksandr Karpenko

Verified Expert  in Engineering

Data Science Developer

Amsterdam, Netherlands

Toptal member since June 21, 2022

Expertise
SQLPythonA/B TestingMachine LearningWeb DevelopmentTensorFlowFlask
Bio

Oleksandr is a data scientist with over six years of experience building data-driven solutions for analytics, product development, and machine learning (ML) applications. He has strong competencies in analytics, scientific research, and data manipulation at scale using Python and PySpark.

Portfolio

Booking.com
Python 3, PySpark, Data Science, Machine Learning, SQL, Model Development...
DAIN Studios
Machine Learning, Data Science

Experience

  • Data Science - 7 years
  • Python - 6 years
  • SQL - 6 years
  • Jupyter Notebook - 5 years
  • A/B Testing - 5 years
  • Python 3 - 5 years
  • PySpark - 5 years
  • Machine Learning - 3 years

Availability

Part-time

Preferred Environment

Python 3, PySpark, Jupyter Notebook, Python, SQL

The most amazing...

...project I've worked on is a quantum mechanics simulation of an atomic silver nano-ribbon embedded into a DNA molecule.

Work Experience

ML Scientist

2017 - PRESENT
Booking.com
  • Created and deployed an end-to-end ML classification model based on uplift modelling for user discount allocation. Developed ML predictive models for competitor analysis.
  • Developed ETL data pipelines using Apache Spark and Kubernetes.
  • Supported multiple product teams with an A/B testing setup, key metrics definition, experiment analysis, exploratory analysis, data visualisation, and reporting.
Technologies: Python 3, PySpark, Data Science, Machine Learning, SQL, Model Development, Pandas

Data Scientist

2016 - 2017
DAIN Studios
  • Developed an algorithm (based on the similarity metric) for hotel recommendations. Implemented in Python and Scala.
  • Created a web service for ski resort search implemented in Python and Scala.
  • Developed a prototype of a Facebook messenger chat bot for image recognition, using TensorFlow.
Technologies: Machine Learning, Data Science

Experience

Image Recognition App

Built an end-to-end image recognition Facebook messenger app based on TensorFlow and the Flask framework. The images taken by phone were classified and returned to the messenger app with classification details and comprehensive information.

Education

2010 - 2015

Ph.D. Degree in Physics

University of Oulu - Oulu, Finland

Skills

Libraries/APIs

PySpark, Pandas, TensorFlow

Languages

Python 3, SQL, Python

Frameworks

Flask

Platforms

Jupyter Notebook

Other

Research, Data Science, Programming, Machine Learning, Physics, A/B Testing, Model Development, Web Development

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