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Udhayakumar Sundaresan

Senior Software Engineer at Entrayn Education Technologies (P) Ltd.


Software Engineer with close to 4 years of experience on architecture and developing application which handles gigabytes of user data. Developed advertisement serving engines to participate in real-time bids and implemented machine learning techniques to smartly place the bid's. Gained development and operational expertise on Hadoop, HBase, Cassandra, Elasticsearch, Mahout, MySQL and PostgreSQL.

Work History

Mar 2014Present

Senior Software Engineer

Entrayn Education Technologies (P) Ltd.
  • Rewrote the entire back end in Django and lead the development team.
  • Played a lead role in all stage of software development redesigning the product to the requirements of test prep market.
  • Implemented ‘GRE Test prep Math & verbal’ cordova hybrid app's backend which serves questions based on learners strength and weakness which is calculated based on his previous attempts simulating adaptive learning.
  • Created recommendation engine which automatically generates a report on users performance and actions user need to take further and scaled the platform to handle 1000 reports per minute.
  • Created content management backend for all the learning materials using elasticsearch, memcache.
  • Assembled an in-house data capturing and analytics platform using Elasticsearch, logstash and Kibana. 
  • Created platform architecture and migration plan to move towards micro services from monolithic app.
Nov 2012Aug 2013

Software Engineer

Reducedata ( Acquired by Snapdeal, India )

Charged with design and development of various components of product stack, that serves bid-request at sub-milliseconds spanned across multiple data center.

  • Supply Side Platform (SSP) Integration - Created campaign synchronization and integration of Google AdExchange and MoPub to RTB platform.
  • Created modules for Ad campaign creation and management using Apache Cassandra database at backend. Designed Apache HBase tables for analyzing the live traffic data of Ad Campaigns.
  • Campaign action recommendation - Designed and created Recommendation module, which monitors live Ad Campaign’s multiple parameters like Daily budget, Total budget and takes/suggest actions based on user-configured conditions. It uses to span workers and distribute the workload on HBase cluster.
  • Real-Time Bid Computation Engine - part of Design and Implementation of Real-Time Bid Computation Engine using Real-Time performance data of ad campaign.
  • Programmatic Optimization and Predictive Analysis - Programmatic Optimization and Predictive Analysis with real-time performance data and Machine Learning algorithms using Apache Mahout and vowpal wabbit.
  • High Performance and Low Latency DSP Ad Server - High Performance, High Availability and Low Latency (< 1ms internal processing time) DSP Ad Server using Java 7, JBoss Netty, Java Springs, REST Express, Disruptor Framework, CQengine, Guava cache, Google protobuf and Apache Kafka
  • Audience Targeting - Audience Targeting Feature integrated with various Audience data providers (Semcasting, Bluekai)

  • Real-time Analytics - Real-Time Data Processing and Analytics using Zookeeper quorum, Distributed Kafka, Distributed HBase and Multiple Reporters (distributed data processing system)
  • Cross Platform Retargeting - Leverage the machine learning technology to identify desktop users on mobile devices, Web users within mobile apps automatically irrespective of location. Automatically retarget users across Mobile apps, mobile games and online websites.
  • Scraped campaign from other providers to migrate to reduce data platforms.
  • Actively managed and participated in deployment of Ad-server across different geographic regions.


Apache Hadoop

Wrote several map-reduce code as well as scalding jobs to handle parquet and sequence file, which stored ad campaign performance data serialized by Avro and protocol buffers.

Wrote several jobs in Pig and analytical queries (join intensive) in HIVE.

Apache HBase

Designed row-keys for more than twenty HBase tables and redesigned them upon requirement changes and migrated data from one cluster to another using pure Map-reduce.Handled several gigabytes of data every day which involves cleaning and sanitization. Planned capacity and handled scaling from three node cluster to twenty node cluster in different stages. 


Created several ad campaigns data and synced them across multiple data center and CDN's to serve ads at the different geographic region. Integrated campaign sync with DoubleClick Ad Exchange ( Google ).

Core Java

Designed and Implemented several chained map-reduce jobs to perform large-scale analytics.

Implemented k-Means Clustering on top of HBase. Designed message processing pipeline using Kafka, and HBase.


Implemented most of the Entrayn product backend in Django.

Designed web scrappers to crawl web site and store it's content in HBase.


Used for Coding competition in Top Coder and SPOJ.

Created  atomic structure visualizer using graphics.h in High school.


IEEE Student Member 2011 and IEEE Computer Society Member 2011.
Microsoft Developers network (MSDN) 2009 - 2012.


Dec 2015Present

Introduction to Big Data by University of California, San Diego


Introduction to Big Data, 1 of 6 courses in Big Data from University of California, San Diego.

Dec 2015Present

Cloudera Certified Developer for Apache Hadoop, License: 100-014-810


Individuals who have demonstrated their technical knowledge, skill, and ability to write, maintain, and optimize Apache Hadoop Java MapReduce development projects.


Sep 2008Apr 2012

Bachelor of Technology - Information Technology

Prathyusha Institute of technology and Management  

Affiliated to Anna University.

Graduated with First class, with 7.81 CGPA.

Jun 2006Apr 2007

Senior school certificate examination

G K Shetty Vivekananda Vidyalaya, Ambattur

Affiliated to CBSE.

Passed with 71%

Volunteer Works

Microsoft Student Partners (MSP), Member.
Participated in 3D photography workshop, Pragyan, NITT.
Online Certification GILD| C++ Gold Certified.
Organized blood donation camps inside college, part of college tech festival Xpkye-2011.
Quiz and online coding contest event in-charge, part of college tech festival Xpkye-2011.
Conducted several awareness sessions on organ donations around Tiruvallur district for Farmers.


‘Secured search over encrypted data in Cloud Storage Systems’ - Proceedings of the International Conference on Mathematics in Engineering & Business Management March 9th-10th 2012, Stella Maris College, Chennai, Vol-II, Pg-204-210. ISBN: 978-81-8286-015-5