Engineer Software

Hemanth Sunkara

#**/*, **** * *****,, HSR Layout, Bangalore - 560 034

+91-990******* ? **************@*****.***

Professional Profile

. Seasoned engineering professional with an experience of 5 years in

designing, developing applications for large scale, carrier grade

distributed systems

. Extensive experience in development in Java

. Designed and developed large scale, highly responsive distributed

applications like profile targeted ads serving engine and statistics

based content recommendation engine

. Designed and developed an application framework for distributed

network applications called Nucleus Platform

. Designed and developed highly scalable centralized monitoring system

for distributed applications using JMX

. Developed framework for hot patching java classes

. Developed SIP and Diameter protocol stacks in Java

. Performed java performance optimization and JVM tuning

. Introduced several process improvements like adopting the Scrum

development model

. Received several individual and team excellence awards for

learnability, quality of work and ideation

Professional Summary

Organization Position Period

OnMobile Global Limited Senior Software April 2009 to Present

Engineer

OnMobile Global Limited Software Engineer September 2008 t0 March

2009

Sasken Communication Software Engineer July 2006 to September

Technologies Ltd. 2008

Knowledge Base

. Programming Languages: C, C++, Java SE &

EE

. Relational Databases: MySQL

. Operating Systems: Linux/UNIX, Windows

. Mobile Technologies: IP Multimedia Subsystems

(IMS)

. Protocols: Diameter Protocol, Session

Initiation Protocol (SIP), HTTP

. Scripting Languages: Shell scripting, Python

. Web Technologies: Google Web Toolkit

(GWT), PHP, HTML, JSP, JavaScript

. Hardware Platforms: Advanced

Telecommunications Computing Architecture

(ATCA), IBM Blade Center and HP Blade server

. Other tools, frameworks and APIs:

Aspect Programming: AspectJ ORM: Hibernate

Non-relational Databases: Apache Cloud Technologies: Amazon Web

HBase services

Distributed Databases: MySQL Reporting Tools: Dynamic Jasper

Cluster Logging: Commons logging, Log4j

Distributed File system: Apache Data interchange: XML, JSON

Hadoop HTTP: Commons HTTP

Statistical Tools: A Rules, R Data Center Management: VMWare

Analytics, VSphere

Apache mahout Project Management: Jira with

Rule Engines: Drools, JRules Greenhopper

Key Value DB/Caches: Memcached, UML: Visio, UML2 for Eclipse

Voldemort Version Control: CVS, SVN,

Search & Indexing: Apache Lucene ClearCase, Git

ETL: Kettle Continuous Integration: Hudson-CI

Webservers: Apache HTTPD, Tomcat IDE: Eclipse

Test Automation: JMockit,

Selenium

Awards & Recognitions

. Received "Exemplary Award" Award for reducing costs by moving the

servers to the AWS cloud in Q1 2010-11

. Received "Star Performer" for eradicating functional and operational

issues in handling large volume of profile data in Q3 FY 2009-10

. Received "Awesome Employee" Award for developing a messaging layer for

communication between distributed entities across systems in Q4 FY

2008-09

. Received Special Mention Team award during Quarterly Awards in Q3 2007-

08 for "Team Work Excellence"

. Received "Spot Award" for my learnability on the IMS domain and for my

efforts to spread it across the organization in Q4 FY 2006-07

. Nominated for the "Fast Track Programme", the top 2% people among all

who joined Sasken in 2006.

Education

. Bachelor of Technology in Computer Science Engineering, Andhra

University, Visakhapatnam, (Class of 2006). Aggregate : 75%

. 12th Standard (Intermediate), Narayana Junior College, Board of

Intermediate Education, 2000-2002. Aggregate : 81%

. 10th Standard, Ramanath Secondary School, Central Board of Secondary

Education, 1999-2000. Aggregate: 78%

Project Details

OnMobile Global Limited

OnMobile is India's largest white labeled company for Mobile, Landline and

Media Service Providers, which offers telecom Value Added Services (VAS),

Voice portals, RingBack Tones, mobile content aggregation & distribution,

interactive media portals, mobile advertising, 1-to-1 direct marketing on

mobiles and M-Commerce.

1) RecoEngine:

Started about 6 months back, RecoEngine is an intelligent content serving

engine that gives statistical recommendations to mobile users based on

their profile and behavior patterns. RecoEngine integrates with various

channels like RBT, SMS, IVR, USSD to reach out to users and serve out the

probable user favorites in a unified way.

a. Product Design

. Ownership of RecoEngine solution and responsibility of the product

design and evolution: Designed the RecoEngine and its various

components from ground up. Started as a recommendation rendering

engine, RE grew into a self-sustained statistical engine which can

horizontally scale with addition of new hardware and can scale

vertically to optimally utilize the system resources. The main

challenges faced in this process are to keep the various components as

loosely coupled and generalized as possible. Apache Mahout provides

the standard statistical algorithms like the collaborative filtering

and keyword clustering to RE.

b. Component Design & development

. Designed and developed the integration layer for unified interaction

with various channels like RBT, SMS, IVR and USSD: RE being a cross

channel recommendation engine, it was important to have the

integration with each of the channels to be as generalized as

possible. The integration layer takes care on channel specific

handling to keep the communication with the internal RE components

unified.

. Designed and developed the content provisioning layer: The content

provisioning layer provisions huge volumes of pre-canned statistical

data into the RE system. To handle the volume, the CP layer has to be

extremely efficient in processing the data. With provisioning data

coming from various sources, CP has to be generalized enough to read

from all sources. Both efficiency and generalization have been

achieved in CP

2) Nucleus Framework:

A network application framework, which can be used to develop low-latency

and high-throughput distributed java applications. It provides an

integrated environment for developing event-driven applications. It is

lightweight (available as a jar) and does not enforce concepts on users

a. Framework Design and Development

. Aspect Programming: With the introduction of annotation driven aspect

programming, generalizing the most commonly used components of a

distributed network application was the need of the hour. Aspects

aided this cause by injecting byte code during complete time.

. Application monitoring: Any sw application required status variables

and counters to measure and tune its performance. But the overhead of

creating this monitoring piece which can integrate with JMX or SNMP is

very high. The runtime monitoring piece in the Nucleus framework

addresses this problem by letting the users add the entire monitoring

functionality just by annotating their counters and variables.

. Application configuration: Changing an application configuration

without having to reboot the application via a JMX or SNMP interface

is a must have for any SW application. Nucleus framework provides this

functionality via annotations.

. Application communication: In a distributed network application,

communication between various distributed components accounts to large

portion of the application performance. Nucleus provides easy to use

API for low latency and high TPS communication between components.

. Utility APIs: Nucleus also provides the most commonly used constructs

as API to the developer like DB connection pool, HTTP communication

APIs, Caching algorithms etc.

3) AdWiser:

Adwiser is a large scale distributed system which resides alongside an

operator's mobile network and servers advertisements to mobile subscribes

based on their profile through SMS, ring back tones (RBT), WAP, ODP etc.

a. Product design

. Designed a distributed architecture for profile targeted ads serving

engine: Designing and developing ads serving engine for mobiles throws

up new challenges as the response time to an ad request <200ms and the

mobile network traffic can scale up to insane volumes. The existing

architecture was facing a number of performance and scalability issue.

We have redesigned the architecture to enable easy scaling and even

distributing the application across the globe. The new architecture

provided considerable performance improvement.

b. Component design and development

. Designed and development monitoring system for AdWiser using JMX:

AdWiser is a distributed system with each component residing in a

separate geographical location. In such a scenario a monitoring system

with which the performance of each node and be monitored and

controlled is required. I am responsible for the Design and

development of the system. Using the JMX API, a central monitoring

system was developed which runs the MBean server. The JMX clients,

which reside along with the nodes, constantly notify the MBean server

of the nodes performance. Remote communication is done over RMI. The

different data structures in java have been extensively used.

. Designed and developed a unified reporting module: With high volume of

CDRs generated in AdWiser, a need for a scalable reporting module to

consume various types of CDRs in a unified way had arisen. The

reporting module should not only be java efficient by also MySQL

efficient. A generalized file handling was developed to consume

various CDR formats. Complex aggregation calculations have been moved

to distributed database notes to provide scale.

. Unified HTTP and UDP API for application integration: Ads are

ubiquitous; we see them in all applications now days. Each of the

application which wants to integrate with AdWiser for ads needs a HHTP

to socket based API to communicate with AdWiser, The same was

developed to keep-up with the volumes handled by AdWiser.

Sasken Communication Technologies Ltd

Sasken is an embedded communications solutions company, which offers a

combination of research and development consultancy, wireless software

products and software services, and works with Network OEMs, Semiconductor

Vendors, Terminal Device OEMs and Operators across the world.

1) Call Session Control Function (CSCF), Nortel Networks:

The CSCF provides session control for subscribers accessing services within

the IMS network. In essence the CSCF is a SIP Server. It has responsibility

for interacting with network databases such as the HSS for mobility and AAA

(Access, Authorization and Accounting) Servers for security.

a. Product development:

. Developed a framework for hot patching java classes: Creating CEE

framework and appropriate use of polymorphism through interfaces made

it possible to apply a patch to a java class without terminating its

execution in the JVM. The state information of the class being patched

has also been successfully transferred to the new patch class.

Extensively used Visio and Rational rose for creating use-case

diagrams and class diagrams.

. Developed the SIP messaging framework for CSCF in Java: Made use of

the MBean concept from JMX. Used the following Java concepts: Reusing

classes through inheritance, use of interfaces and abstract classes,

use of containers in the form of Hash Maps and Lists. Implemented the

SAX XML parser.

. Developed Diameter protocol for Rx Interface in Java: Various Rx

messages of the AAA protocol have been formed, parsed and processed.

Development involved interaction with TCP and SCTP layers also. The

stack incorporates support for redundancy, handles hardware failure

and state transmission through check pointing.

. Designed the Journaling log framework for the OAM layer in Java:

Creates journaling logs at user defined log level. Has a direct impact

on the performance of the system and has been perfectly handled

through concurrency. Extensively used Visio and Rational rose for

creating use-case diagrams and class diagrams.

. Created configuration interface for ATCA in C: The existing Command

line interface to configure ATCA has been updated with a GUI version.

The development involved interaction with the Java Swing front end and

the backend configuration engine. The new version had clear advantage

in response time.

b. Product Verification:

. Extensively verified the Cx, Rx, Rf interfaces at the protocol level:

In the verification process tasks like XML Parsing, scripting in Unix

and Perl, developing tools where performed. Swings, event handling,

multithreading concepts of Java were used while developing tools.

. Responsible from the verification of the ACTA platform entities: This

verification involved using various features of the middleware like

Service groups, service units, operational and performance

measurements to ensure carrier grade reliability and performance are

provided by the system.

Extra-Curricular Activities

. Founded the "OnMobile Gaming Club", forum for gamming enthusiasts in

November 2010

. Won the "Bangalore Go Karting Championship" conducted by ICICI Bank in

February 2009

. "Creative Head" for organizing the annual celebration called Detox in

Sasken

. Charter President of Rotaract Club, Youth wing of Rotary Club of

Visakha Valley

. Editor of "Brainwave", a fortnightly magazine of Anil Neerukonda

Institute of Technology & Sciences (ANITS)

Other Details

. Date of Birth: 21 October 1984

. Languages Known: English, Hindi and Telugu

. Hobbies: Photography, Travelling, Gaming, Kart racing and Graphic

Designing

References

. References will be provided on request

Date: 24 July 2011 HEMANTH

SUNKARA

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