Ritabrata Bhattacharya has over 11 years of experience as a big data engineer and software engineer specializing in Hadoop, analytics, and data visualization with R. He has extensive exposure to Apache Hadoop, Hive, and MapReduce and has implemented big data infrastructures and resolved complex issues involving large-scale data. He also has experience in data analytics using R for data import, manipulation, exploration, and visualization. His work history includes roles supporting digital payment applications at Visa involving testing, validation, and analytics on platforms like Hadoop, Datameer, and Tableau.

1. RITABRATA BHATTACHARYA
12370 Alameda Trace Circle #1527, Austin, TX 78727♦512.586.6416♦rivthebest@gmail.com
BIG DATA ENGINEER
Results-driven, dedicated, and accomplished Software Engineer with an 11-year track record of
developing and implementing customized software solutions for various technologies with a strong
interest and background in Big Data infrastructures and resolving complex issues involving large
scale data, analytics, and reporting. Analytical professional with the ability to effectively evaluate
and process structured and unstructured data. Highly skilled at project management, successfully
planning, executing, and completing projects to align with business needs. Recognized leader
capable of leading and motivating team members to meet and exceed organizational and individual
goals. Excellent interpersonal skills used to interact and cultivate long-term business relationships
with stakeholders, partners, associate, senior leaders, vendors, and clients.
EXPOSURE IN HADOOP WITH MAP-REDUCE
Having exposure in installing and configuring Apache Hadoop version 1.0.4 in Ubuntu 12.04.10 and
in Oracle Enterprise Linux 5.8 along with Hive installation and configuration.
Configuring the core-site.xml(temporary directory details along with Hadoop file system related
details), mapred-site.xml(hadoop’s job tracker related details) and hdfs-site.xml(replication
related information). All these files are residing under Hadoop installation directory under conf file
system.
Map Reduce is programming model for the data processing in Hadoop Big Data Stack
Several high level languages including, Java, Python, Ruby, C++, C#, Shell etc can be used for writing
Map-Reduce programmes.
Map Reduce programs are inherently parallel and it breaks the process into 2 phases, Map Phase
and Reduce Phase containing key-value pair as input and output.
In order to execute the program a Map-Reduce job is needed.
To run the Hadoop job we need to issue the command as ‘hadoop jar <jar-file name> <job class
name> <input directory containing file> <Output directory>’ [Output directory should not exist as it
will get created during the execution of the Map-Reduce job].
EXPOSURE IN DATA ANALYTICS SOFTWARE R
Understanding the Data Import and Data Quality in R – Data import activity is performed using
text file, csv file, spreadsheets(using xlsx package in R), XML(XML package in R), databases(RJDBC,
RODBC, RORACLE, RMYSQL, DBI) and through other statistical software like SAS, SPSS and from
other possible data format.
Understanding Data Manipulation in R – Data manipulation activity using data formats like
(vector, matrix, data-frames, list) and with the variety of datatypes (numeric, character, date time,
logical) by applying different kind of data manipulation functions operated on numeric and
character variety data.
Understanding Exploratory Data Analysis in R – Exploratory data analysis is done by using
multiple statistical methods like mean, median, standard-deviation, min, max, quartile, box-plot and
histogram.
Understanding Data Visualization in R – Data visualization and Visual Aesthetics are done using
different kind of graphs(viz. scatterplot, hexbin, lineplot, sunflowerplot, tableplot, barplot, piechart,
heatmap, histogram with density and etc.) and customizing the graphics with RColorBrewer and
with some other advanced packages in R and web application package shiny.

2. RITABRATA BHATTACHARYA, CV Page 2
MAJOR PROJECT SUMMARY
VISA Inc. – VISA Checkout Analytics and Reporting, Singapore, Austin, TX, USA
Senior Associate, Jan-2014::Present
The project scope lies in testing different reports for the business segments of Merchant, Issuer,
CheckOut for the Digital Wallet Web Application named Visa Checkout(Web based Electronic Payment
application) using the technology Hadoop, Datameer, Tableau.
Role Played:
Working as a QA Engineer to validate E2E(End to End) data consistency in Hadoop system and
generated report validation from a functional regression standpoint via White Box testing.
VISA Inc. – VMe Payment Wallet Integration, Singapore
Senior Associate, June-2013::December 2013
The project scope lies in integration of the Consumer Module through the Merchant Control in the
VMe Digital Application for executing transaction to ensure the hosted Checkout Application is
running perfectly for the business segments of Merchant.
Role Played:
Worked as a QA Engineer to validate the consistency of the integration from the application
perspective for merchant and checkout application components for multiple countries, Payment
Instrument types and currencies.
VISA CEMEA/AP. – VisaOnLine(VOL), Kolkata, India
Senior Software Engineer, October-2011::September-2012
The project scope lies as a Platform Service Engineer in the application area VISA OnLine which was a
one-stop portal, catering multiple services for Visa members.
Role Played:
Worked as a Platform Services Engineer for the migration of the Visa OnLine platform from .NET 1.1
to .NET 2.0 and also responsible for the content management for the Visa OnLine members along with
the data validation for the published report through this site for the multiple member banks in CEMEA
region.
VISA Inc. – VCIS and Verified By Visa, Kolkata India, Foster City, CA, USA
Senior Software Engineer, January-2011::September-2011
The project scope lies in enrollment of the BIN information with respect to each of the member banks
of VISA and to ensure by testing through the web interface for the BINs are participating in the
Verified By Visa program.
Role Played:
Worked as a QA Engineer to validate the consistency by validating the data consistency through the
database and through the integration from the web application standpoint whether BINs are
participating in the Verified By Visa program or not.
VISA Europe. – VISA Europe Clearing and Settlement Services, Reading, United Kingdom
Senior Software Engineer, June-2010::September-2010
The project scope lies in developing and implementing the Business Rule related to the Clearing and
Settlement using ILOG/JRules(Changing the BOM, XOM and changing the Rule Design using graphviz
utility. The application is settling multiple fees among the member banks and payment gateways like
VISA in the European region.
Role Played:
Worked as a Development Engineer to develop, implement and validate Clearing and Settlement Fee &
Charges rules using ILOG/JRules in Clearing and Settlement business segment.

3. RITABRATA BHATTACHARYA, CV Page 3
TECHNICAL PROFICIENCY SUMMARY
High-Level Language JAVA6/7, VB6, ShellScript (Using awk, sed, grep), XML, XSLT,Java
Script(including jQuery)
Databases/Structures
Methodology
SQL Server 2000, 2008, 2014, Oracle 9i, MySQL 5.5 Postgre SQL
Derby, Access 2013.
Other Tools/Frameworks Weblogic Server 8.1, Genesys 7.6 Framework, ILOG/JRules,
Apache Hadoop 1.0.x, Hive, Spring, Hibernate,
Statistical Framework R, D3JS, Excel 2013 Power BI, Power Query,
Hands-on experience in F#, Python 3.
Exposed to
Industry/Market
Wholesale Gateway for Order Processing in Telecom, IVR
(Interactive Voice Response Unit) based application in Payment
Industry, Development on Rule in Clearing and Settlement in the
Payment System. Digital Payment Wallet Application
Operating System &
Platform
Solaris 8/9/10, Windows 2000, 2003, Ubuntu 12.04.10
VISA Inc. – Application Support for Enterprise Service Engineering, Kolkata, Foster City, CA, USA
Senior Software Engineer, September-2008::April-2010
The project scope lies in maintenance and application support for the Genesys IVR application for
VISA Inc. along Tivoli Identity Management support partially.
Role Played:
Worked as a Support and Maintenance Engineer for the application of GVP(Genesys Voice
Platform)VRU-IVR.
Qwest Telecom Inc.(Now CenturyLink) – Wholesale Gateway Order Processing, Bangalore India
Senior Software Engineer, March-2006::September-2008
The project scope lies in maintenance and application support for the Wholesale Gateway telecom
applications, largely used for order processing, customer record maintenance, billing, voice and data
record maintenance.
Role Played:
Worked as a Support and Maintenance Engineer for the application of GVP(Genesys Voice
Hewlett-Packard-GDIC – ISEE(Instant Support Enterprise Edition), Bangalore India
Software Engineer, August-2004::March-2006
The project scope lies in application support for the global monitoring tool to track the incidents
coming from different servers situated in the different geographical locations.
Role Played:
Worked as a Support Engineer for the application of ISEE.