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On average, 38 Data Science projects are completed every quarter on Upwork.


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Data Science Upwork freelancers typically receive a client rating of 4.85.

Last updated: October 1, 2015

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Pavel Logacev

Pavel Logacev

Data Science | Statistics | R Programming

Germany - Tests: 4 - Portfolio: 3

I have a PhD in Cognitive Science and a MSc in Computational Linguistics, as well as several years of experience in statistical data analysis and software development in R. I have developed software in pure R as well as in C/C++/Rcpp, with a focus on the implementation of machine learning algorithms and statistical techniques. I enjoy understanding all kinds of data, as well as helping others understand it and convert it into actionable intelligence. I am particularly interested in churn analysis and statistical consulting regarding usability studies or A/B testing in advertisement and e-commerce. I have experience in analyzing and reporting on data from sectors as diverse as psychology, education, health, finance, SEO and E-commerce. Most recently, I have analyzed online user behavior for, and created a Bayesian model of conversion and profitability to manage campaigns on Google Adwords. I specialize in churn analysis and survival random forests, but I can help you with anything from simple ANOVAs or linear mixed effects models in lme4 to Bayesian methods in RStan.

91% Job Success
$45.00 /hr
520 hours

Alexander Khlebushchev

Alexander Khlebushchev

Machine Learning / Data Science Analyst

Russia - Tests: 1 - Portfolio: 1

I do machine learning, data mining, scientific analysis, including all stages of data processing. I have a professional experience in Python and C/C++ as program languages. I experienced in applying of scientific solutions (algorithms) to engineering, scientific, analytical and business problems, starting with searching for appropriate solutions and ending with program implementations (sometimes including high load).

$55.56 /hr
0 hours

waldemar kwasniewski

R Programmer, data science, data mining


I am an experienced R programmer and data analyst, ready to use my knowledge, practice and interest in data science to find a quick, reliable and clever way to perform any task you have to be done. I can help you to extract actionable knowledge form your data, find dependencies, build predictive models, translate your concepts into formulas, and your ideas into algorithms. My main fields of expertise are: • data mining and cleansing - fluent in extracting useful data using fast and flexible tools; • market analysis, statistical computing - finding patterns in data to gain interesting insight, based on solid statistical knowledge and visualised in an approachable way. I strive for excellence in each aspect of the project, guaranteeing maximum focus on detail, providing a solution tailored to the customer's expectations and top-class communi I am looking for projects in mathematics, machine learning, signal processing

$22.99 /hr
2 hours

David Mestre

David Mestre Agency Contractor

Python, Web Scraping, Data Analysis, Data Science

Spain - Tests: 9 - Portfolio: 2

- Data cleaning, data analysis, modeling and simulation techniques using Python - MySQL/MongoDB/Sqlite/Sparql/Postgresql - System administration - Machine Learning - Web scraping/crawling with python - Parsing xml/csv/json - AWS servers - Python libraries: pylab, scipy, pandas, matplotlib, ggplot, seaborn, bokeh, numpy, csv, re, json, urllib, urllib2, socket, httplib, sklearn, BeautifulSoup, selenium, requests, lxml, xml, sys, so, subprocess - IDEs: iPython notebook, Komodo Github:

Associated with: Silver Seahog

94% Job Success
$40.00 /hr
1,165 hours

Stephen McMurtry

Stephen McMurtry

Data Science and Data Visualization Specialist

Canada - Tests: 3 - Portfolio: 1

I have 2.5 years experience working with python, java, and mysql at a company that produces internet connected thermostats. My core compentency is modelling, algorithm design, and data visualization on large datasets. My most used tools in python are pandas, scipy and matplotlib. I have experience in web and document scraping. I also have experience creating web applications using d3.js and jquery. I am most interested in complex jobs that use many of these skills to create meaningful products.

$50.00 /hr
0 hours

Ahsan shafiq C.

Ahsan shafiq C.

Top Game Developer / Data Scientist & R Developer

Pakistan - Tests: 2 - Portfolio: 5

I have 5+ years of experience in Software Development and Design in various leading technologies. I have worked for International Customers and helped them growing their business and expanding the profitability. Over the last 5 years, I have developed a wide range Mobile applications, which include iPhone/iPad/Android/J2ME. I have developed both games and eCommerce applications for iPad/iPhone. I have Masters Computer Science with focus on Data Mining and Machine Learning. I have been doing statistical data analysis in R for 2+ years now and have experience working with a variety of single/multiple regression, multi class classification and clustering techniques. I have been involved in development of: - Ruby on Rails - iPhone/Android Native Applications for the Enterprise - iPhone/Android Games Specialties: iPhone SDK / Android / J2ME / Symbian / BREW / BlackBerry Cocos2d / Cocos2d-x / Unity3D / OpenGL ES / Quartz 2D Box2d / Chipmunk Ruby on Rails (ROR) C / C++ / Objective-C / Cocoa Framework / C#

Groups: Application Developers Alliance

99% Job Success
$30.00 /hr
3,555 hours

Igor P.

Igor P. Agency Contractor

Expert Software Developer/Data Scientist

Russia - Tests: 7 - Portfolio: 12

Expert C++/Python/Node.JS Developer and Data Scientist with 12+ years of experience and Master's Degree in Computer Science. Over 12 years of Igor P. 's work experience he has been acting in a wide range of roles, such as Senior Software Engineer, Statistician and Team Lead. Igor's core interest and competency is technical problem-solving. He has developed (working in a team or as a Team Lead) a number of software products, primarily network applications, system services, middleware services, data processing systems, hardware management systems, real-time systems, network protocol implementations. He is looking for opportunities to work on technically complex software projects, requiring deep understanding of software technologies. Igor has experience in C++, Python, Node.JS, JavaScript, Java, C#, Bigdata, Machine Learning, Middleware, System Software, Web Applications, High-performance Network Servers, Distributed Data Processing Systems, and Algorithms.

Groups: Upwork Verified Developers

Associated with: Mediterra

97% Job Success
$36.00 /hr
5,647 hours

David Stephens

David Stephens

Data Analyst

United Kingdom - Tests: 2 - Portfolio: 2

Hello, I am a Data Analyst with 5+ years professional experience with a background in scientific research including publishing peer-reviewed papers. I have BSc (1st class honours) in Geographical Information Systems and Science. I am most interested in contracts that would take advantage of my R skills for data analysis and visualisation. Including: geospatial analysis, statistical modelling, data mining or building shiny data apps. A summary of my skills and experience: - Diverse types of research including geospatial analysis, statistical modelling, image analysis, GIS. - Daily use of R with experience of packages such as: dplyr, ggplot2, caret, sp, rgdal, gstat. - Developing interactive data tools using R’s ‘Shiny’ framework - Also have experience scripting in Python and SQL Statisitcs: - Linear regression, principal component analysis, t-tests. - Machine learning algorithms (random forest, neural networks) - Cluster Analysis (unsupervised classification) - Non-parametric significance testing (monte-carlo simulations) - Geo-statistical Interpolation (kriging) Other: - Image Analysis: Object-based image segmentation - Textural analysis for pattern recognition - Working with PostgreSQL/postGIS databases - Software: ESRI ArcGIS; Erdas Image; GRASS; QGIS; eCognition; SPSS.

$35.00 /hr
0 hours