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Oleg R. | Elance
 
176985602337900
Last Sign-in: Mar 17, 2016

Oleg R.

Data scientist with strong programming skills
   Russia
  |  7:13 pm Local Time

Overview

Minimum Hourly Rate $25

Data scientist with strong programming and academic background, interested in data mining using machine learning and other AI techniques.
I've studied machine learning and data analysis online courses from leading universities (Stanford, Duke, Caltech) and trained on practical projects from Kaggle with a score in the top 10% of involved data scientists. I've recommended missing links in a social network (Facebook), predicted the salary of job ad based on its contents (Adzuna), auction price (FastIron), built a web pages classifier...

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Sep 9, 2015|Data Analysis|Private|Completed
|
3.9
Jun 13, 2015|Data Science|Private|Completed
|
5.0
May 26, 2015|Data Analysis|Private|Completed
|
5.0

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Portfolio

Visualizations from my routine machine learning study
Machine Learning, by Andrew Ng, Stanford University
Web Intelligence and Big Data, by Gautam Shroff
Natural Language Processing, by Dan Jurafsky and Chris Manning, Stanford University
Building a Search Engine, by David Evans, University of Virginia
Introduction to Artificial Intelligence, by Sebastian Thrun and Peter Norvig, Stanford...
Statistical Learning, by Trevor Hastie and Rob Tibshirani, Stanford University
Algorithms: Design and Analysis, by Tim Roughgarden, Stanford University
C++ For C Programmers, by Ira Pohl, University of California, Santa Cruz
Introduction to Data Science, by Bill Howe, University of Washington
Neural Networks for Machine Learning, by Geoffrey Hinton, University of Toronto
Artificial Intelligence, by Dan Klein and Pieter Abbeel, Berkeley
Data Analysis and Statistical Inference, by Dr. Mine Çetinkaya-Rundel, Duke University

Skills (10)

Tested
C
My Score
avg

Service Description

My projects concerning machine learning and data mining:

Machine learning for advertisement targeting (Video International Group). Predicted gender and age from the user's click stream. Investigated the possibility to predict the type of TV viewer from the user's click stream. Used tokenization, latent semantic analysis (LSA), logistic regression or random forest.
Tools: python, sklearn, scipy, numpy, nltk, Cassandra, Hadoop

Recommended missing links in a social network (Facebook) as a Kaggle competition. Earned 23rd position out of 418 data scientists (top 10%). The objective was to predict new links to users of large network (1.5M users, 10M links). Used some generative algorithms to predict nodes ratings: user-user recommendations, item-item recommendations, variations of PageRank. Combined these ratings as features with more features, mostly distances. Used random forest for learning.
Concepts: Collaborative Filtering, PageRank, Random Forest Classifier
Tools: python, sklearn, numpy, pypy, numba

Predicted the salary of UK job ad based on its contents (Adzuna) as a Kaggle competition. Earned 21st position out of 289 data scientists (top 10%). The objective was to predict salary from the contents of the job advertisement. Used natural language preprocessing methods (tokenization, stemming, lemmatization, TF-IDF,..). Different methods of supervised learning were used and blended in final prediction.
Concepts: Feature Selection, RF, Gradient Boosting, Blending...

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Employment

Freelance at Kaggle, Experfy, CrowdANALYTIX, etc.
Data Scientist
2012 - Present
- machine learning for various projects: - recommended missing links in a social network (Facebook) - predicted the salary of UK job ad based on its contents (Adzuna) - predicted the auction sale...
GERO
Data Mining Analyst
2014 - 2014
machine learning for disease prediction from human biometric data; predicted age and diseases from locomotor activity of flies
Telecom Media
Developer
2012 - 2013
- machine learning for advertisement targeting - predicted gender from user's click stream
Rambler
Team Leader
2002 - 2012
- highload web advertising service with 10 million visitors per day - stable performance with 500 times traffic's growth from start up - heavy realtime statistics subsystem for ads targeting on...
Stack Group
Senior Software Engineer
1999 - 2001
- startup: advertising system from scratch (ads management, ads rotation, realtime statistics, wed interface) - core of this advertising system works at Rambler so far
Institute of Protein Research
Senior Software Engineer
1990 - 1999
- software for genome sequencing with nested strand hybridization - development of systems of control devices - interactive graphics systems under MS Windows - graphics system under MS DOS
Institute of Protein Research
Postgraduate
1984 - 1989
- investigation of the kinetics of protein folding - experimentally proved the existence of an intermediate state in protein folding - software program of decomposition of the kinetic curve -...

Education

Stanford Online Courses, Coursera, Edx
MS
2011 - 2014
Sankt Petersburg State University
MS
1978 - 1984
Overview  |  Job History  |  Portfolio  |  Resume/C.V.

Keywords

Data Mining
Machine Learning
Predictive Analytics
Statistical Analysis
Natural Language Processing
python
R
Matlab
C++
SQL
numpy
scipy
sklearn
Hadoop
MapReduce
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Elance Level
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  • 12 months
  • Lifetime
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Identity
Username
orazaro
Type
Individual
Member Since
October 2014
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Oleg R. | Elance

Oleg R.