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Last updated: August 1, 2015

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  1. 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
    0 hours
  2. David Mestre

    David Mestre

    Python, Web Scraping, Data Analysis, Data Science

    Spain - Tests: 10 - 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 - Python libraries: pylab, matplotlib, pandas, ggplot, numpy, csv, re, json, urllib, urllib2, socket, httplib, sklearn, BeautifulSoup, selenium, requests, lxml, xml, sys, so, subprocess - IDEs: iPython notebook, Komodo Furthermore, I am specialized in editing scientific and technical texts and proficient in American and British English. I'm a native Portuguese speaker living in Spain since 2008, I can offer you translations from English to Portuguese or Spanish at a reasonable price. Whether you need to translate a casual or formal text I can provide you with a prompt and culturally sensitive translation.

    $40.00 /hr
    1,032 hours
  3. Andrey Ogurtsov

    Andrey Ogurtsov

    Biostatistician / R programmer

    Ukraine - Tests: 1

    Biostatistician with 3 years of experience. Favourite programming tools - R and SPSS. Performed works: • definitions of primary and secondary variables; • sample size calculations; • writing statistical analysis plans for phase I-IV and bioequivalence trials; • performing statistical analysis and writing statistical reports; • creating CRF; • data input and verification; • developing correspondent SOPs. STATISTICAL AND MACHINE LEARNING SKILLS: • classical methods of analysis; • general and generalized linear models; • non-linear modeling (splines, GAMs); • tree-based methods (bagging, random forests, boosting); • dimension reduction (PCA); • clustering (hierarchical, K-means); • cross-validation; • bootstrap; • multiple comparisons adjustments. PROGRAMMING SKILLS: • using R functions for wide range of statistical methods; • writing new R functions to implement desired functionality; • data wrangling with basic R functions and packages like reshape2; • data visualization (basic graphs and ggplot2); • automated report generation and reproducible research (knitr with R Markdown or LaTeX); • interactive presentations with shiny, rpanel and googleVis; • SPSS (both GUI and syntax); • SQL (basic knowledge).

    $10.00 /hr
    0 hours
  4. Vineeth Mohan

    Vineeth Mohan

    Data scientist

    India - Tests: 1

    Auther of the book Elasticsearch blueprints - Elasticsearch certified trainer who have conducted trainer for number of MNC’s like microsoft , flipkart , cisco and philips Live project – Stackoverflow - Stackoverflow Careers - Linkedin - Github - Career (Experience –75 years) • Architect/Data scientist at Algotree Research private limited (June 2011 to Present) • Software Engineer at Yahoo! India (March 2009 – May 2011) • Internship as Service engineer at Yahoo!India (May 2008 – to February 2009) Career highlights and honors received ● End to end design and management of Newsmills from inception to completion. ● Knowledge acquisition and adoption of various open source tools and technologies ( Mahout , Elasticsearch , Opengamma , cleo , Rstudio-server , D3 js , Twitter Bootstrap) to meet the requirements of the management. ● Spot bonus award at yahoo ● Various appreciation awards from coworkers – yahoo ● Chairman of MACS(Model engineering college association of computer science students) – 2008 , various inter collage technical competition awards at collage. Behavioral Competencies ● Clear in-depth conceptual clarity on the subject along with knowledge gathering skills. ● Self-motivated and can work with less or no management. ● Passion to adopt the best suited technology and attain the best performance. ● Clearly sets the boundary between code quality and business deliverables. Technical Skills ● Languages: ● Application level languages – Java ● Machine learning tool – Mahout ● Statistical languages - R ● Scripting – Perl, Shell , Awk , Sed ● Web technologies – HTML,Javascript ,CSS , jQuery , Bootstrap. ● Expert in Technology and Tools : Elasticsearch , Lucene , Opengamma , Cleo. ● Systems: Unix Operating System (LINUX – Ubuntu , Debian , Red Hat) ● Strong computer fundamentals in Data Structures and Algorithms, automata languages and computation.

    $34.00 /hr
    95 hours
  5. Rowan V.

    Rowan V.

    Data Scientist

    United States - Tests: 7

    I am passionate about quantitative investigative methods and data analysis. I have experience utilizing a variety of methodologies and tools, including R, Python, and Tableau in order to answer data-related questions. Currently @Twitter, formerly at Spartz, Inter-American Development Bank, and Cambridge Energy Labs. I have a B.S. from MIT, and have a strong background in experimental design, statistical analysis, data visualization, and machine learning techniques. With over 10 years of programming experience and a strong statistical background, I can help you make sense of your data. I am able to provide writing and coding samples of my past work, for a few of my past projects, please check out .

    $80.00 /hr
    9 hours
  6. Waldemar K.

    R Programmer, Machine learning, algorithms, AI, data science

    Poland - Tests: 2

    Data analysis, data mining, time series, Kalman Filtering, learning methods, fuzzy time series, signal processing, probablistic models, evolutionary algorithms, genetic algorithms, neural networks, optimization, statistical methods. Interested in developing trading strategies, backtesting. Interested in forex trading, all betting strategies, ratings, algorithmic trading, machine learning algorithms applied in trading, pattern recognition, financial markets and analysis. And other projects which require mathematics and quantitative, analytical skills, knowledge of finance, investments, bond mathematics and interest rate models, portfolio analytics.

    $19.99 /hr
    58 hours
  7. Arif uzzaman

    Arif uzzaman

    Swift, Objective-c,Xcode, Asp.Net Web API,WPF, MEF, R, Data-Science

    Bangladesh - Tests: 17 - Portfolio: 3

    9 plus years background in Obective-C, Swift, c#.NET, Android & BI development. Very comfortable and relax to work both Windows (.net, Web Api, WPF) and Apple (Objective-C & Swift) With JavaEE development (JBoss, EJB, JPA, Struts, WebService, Eclipse IDE). Have experiences more than 5+ years on Business Intelligence development (SAP BO/BI and Microsoft BI, QlikView). Has 2+ years experience to develop solutions in TelCo industry. In-depth knowledge of various platforms, software systems, and servers. Extensive programming experience using WPF with MVVM pattern and MEF and PRISM framework, Web API, Objective-C, Swift, Android, MSSQL, MS SharePoint 2010, SAP BI/BW. A researcher who can pick any technologies to work and come to a solution. Architect of enterprise applications for different platforms running seamlessly and currently using 40000 users all over the world. (

    $12.00 /hr
    173 hours
  8. Thomas N.

    Thomas N. Agency Contractor

    MD student w/ skills: Python, Excel, Data Science/Analysis/Viz/Scrape

    United States - Tests: 7 - Portfolio: 6

    Over the past 5 years, I have developed a unique skillset that is mainly focused on manipulating, visualizing, and understanding data. As a medical student, I've utilized big datasets distributed by the CDC and other governmental organizations to find and anlayze trends in healthcare for research. My core competency lies in utilizing everything from smaller datasets in Excel to writing complete programming solutions to handle very large and complex datasets. I work primarily in python using the main data science libraries (pandas, numpy, scipy) as well as scrape my own data directly into a database using other python libraries (beautifulsoup, mechanize, scrapy). No matter the project, if my studies allow me to have available time, I can complete your data analysis, database manipulation, and other data related projects for you or your business efficiently and with close attention to detail. I also have experience in the following areas: SQL, MongoDB, Microsoft Access, and javascript libraries such as charts.js or D3.js. I am also very familiar and comfortable with medical terminology and am capable of distilling the information in to more accessible terms. I know how difficult it is to understand sometimes but I am able to generate content or review/edit content utilizing my medical school education.

    Associated with: MD pending

    $55.56 /hr
    3 hours
  9. Jose M. Berutich

    Jose M. Berutich

    Big Data, Machine Learning, Data Science

    Spain - Portfolio: 5

    Ph.D in Artificial Intelligence.  Machine Learning, Data mining and Business Intelligence veteran with 10+ years of experience across different sectors including Finance, Retail and Marketing. Data science experience across a broad range of areas, including price modeling, Statistics, and Model Building. Developer of trading algorithms for forex, equities and futures.  - Quantitative Finance - Automated/Algorithmic Trading Strategies Development - Trading Platforms and API  - Backtesting / forward testing and Optimization

    $55.56 /hr
    53 hours