Narendra Reddy Yediginjala, Big Data Developer in San Francisco, CA, United States
Narendra Reddy Yediginjala

Big Data Developer in San Francisco, CA, United States

Member since June 28, 2018
Narendra has 14 years of experience in data engineering, data science, business intelligence, and data warehousing. He has handled multimillion-dollar projects for clients and worked with numerous big data tools including Hadoop, Hive, Spark, Scala, Python, and SQL. Narendra's largest projects have been for clients in financial services and healthcare, including Aetna, TIAA-CREF, and ADP.
Narendra is now available for hire




San Francisco, CA, United States



Preferred Environment

MySQL, Oracle, SQL, Python, Scala, Spark, Apache Hive, HDFS, Hadoop, IntelliJ

The most amazing...

...project I've deployed was a distributed-system reporting platform. I redesigned BI systems with reusable components, reducing development time to six months.


  • Senior Big Data Engineer

    2019 - PRESENT
    Change Healthcare
    • Created Spark programs with Scala to generate demographic relative scores based on different algorithms.
    • Developed and enhanced a demographics-based identity platform.
    • Created, administered, and managed EMR clusters on an AWS platform to run the Sparks program.
    • Worked extensively on AWS S3, AWS Glue, and EMR for data processing.
    Technologies: Amazon Web Services (AWS), AWS S3, EMR, AWS, SQL, IntelliJ IDEA, Spark, Hadoop, Big Data
  • Senior Associate

    2014 - 2018
    Cognizant Technology Solutions US Corp
    • Worked on multiple multimillion-dollar projects with different clients.
    • Migrated a slow-performing data reporting platform to distribute a computing-based data platform using Oracle BDA.
    • Enhanced and maintained TIAA PlanFocus, an application for a data reporting platform.
    • Worked on a data integration platform to gather, transform, and report data from multiple sources.
    • Rewrote ETL jobs from Talend to IBM DataStage with enhanced reusability and performance.
    • Migrated a reporting platform from T+2 ETA to T+1 8 AM ETA.
    Technologies: Oracle, Datastage, SQL, Hue, Cloudera, Impala, MapReduce, Apache Hive, HDFS, Hadoop, Big Data
  • Technology Lead

    2011 - 2013
    Infosys Limited
    • Rewrote and enhanced the functionalities for a new business-related reporting system.
    • Modified parallel jobs to include recent changes, migrating the old data from DB2 history tables to Oracle tables.
    • Developed data model changes for the functional enhancements to coordinate with the DBA team to get the necessary requirements.
    • Migrated from a legacy platform to a modern eCommerce platform with minimal issues.
    • Kept pace with the frequently changing user requirements and delivered high-quality parallel jobs on time.
    Technologies: IBM Db2, SQL, Datastage, Data Warehouse Design, Data Warehousing, ETL
  • Senior Member – Technical

    2006 - 2010
    ADP Private Limited
    • Developed ETL jobs using data rules defined by the business.
    • Wrote and executed unit test scripts using internally developed frameworks.
    • Supported ETL jobs in the production environment and resolved issues as they arose.
    Technologies: Oracle, SQL, Datastage, ETL, .NET


  • UPI – IHDP (Development)

    IHDP is a data platform under development by Change Healthcare. The platform is designed to gather data from multiple external sources, create indexes on core demographics, link all the records based on indexes, and serve different data consumers.

  • JAD (Joint Data Analytics) – Data Science (Development)

    After CVS and Aetna merged, Aetna launched an analytics initiative to utilize data from both companies to improve services and overall business performance. Understanding data from different sources and creating different analytic datasets allows the merged company to run multiple machine learning algorithms.

  • Finance Data Repository (FDR) (Development)

    Finance Data Repository (FDR) is a long-term program that Aetna initiated to transform its existing operational and analytical reporting infrastructure from a legacy infrastructure to a Hadoop-based infrastructure. The FDR is a data lake with multiple layers and the flexibility to consume data from different layers to serve different purposes.

  • Consultant Book of Business (CBOB) (Development)

    CBOB is a new application built by TIAA for third-party consultants who evaluate and make suggestions on plan performance and outcomes. This application provides metrics and reports to the consultants on their clients' plans.

  • PlanFocus T1 (Development)

    PlanFocus is TIAA-CREF’s website for retirement plan sponsors. This site helps plan sponsors and consultants manage and optimize plans, drive outcomes, and engage employees. TIAA-CREF has invested in PlanFocus to improve its functionalities and the services it provides. PlanFocus T1 is a project to improve data availability for plan sponsors. Before this project, data was refreshed within two days. With this project, the target was to provide data to plan sponsors within one day by 8:00 AM.

  • PlanFocus Data Integration (Development)

    PlanFocus is a client-facing, front-end platform for plan sponsors who enroll employees in their plans. The platform consists of several self-service tools that gather many data attributes from multiple systems and databases. The data integration system gathers data from discrete systems; cleanses, analyzes, and transforms it; and sends report-ready data to a memory-stored data presentation system (Endeca) that creates PlanFocus reports. I executed multiple functional enhancements and InfoSphere server upgrades.


  • Languages

    SQL, Python 3, Scala, Python, Bash
  • Tools

    IBM InfoSphere (DataStage), IntelliJ, Impala, Cloudera, IntelliJ IDEA, Amazon Elastic MapReduce (EMR)
  • Frameworks

    Hadoop, Spark, .NET
  • Storage

    Apache Hive, HDFS, Datastage, IBM Db2, AWS S3, MySQL
  • Other

    Big Data, Data Warehousing, Hue, AWS, EMR, Data Warehouse Design, Data Engineering
  • Paradigms

    ETL, MapReduce, Agile Software Development
  • Platforms

    Oracle, Amazon Web Services (AWS), Linux


  • Bachelor of Technology degree in Electrical and Electronics Engineering
    2002 - 2006
    Jawaharlal Nehru Technological University - Hyderabad, IN


  • Problem Solving (Basic)
    APRIL 2020 - PRESENT
  • Python (Basic)
    MARCH 2020 - PRESENT
  • Machine Learning

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