Valliammai Sundaram, Tableau Developer in Culver City, CA, United States
Valliammai Sundaram

Tableau Developer in Culver City, CA, United States

Member since June 18, 2020
Vali has nearly a decade of experience specializing in SQL, Oracle, and PL/SQL. Currently pursuing a master's degree in data science, she enjoys building applications for clients of all sizes. Valli is currently located in Los Angeles, CA, and enjoys working with global teams.
Valliammai is now available for hire




Culver City, CA, United States



Preferred Environment

MySQL, SQLite, Unix, Linux, Oracle, Data Structures, Excel VBA, ETL, Python, Java

The most amazing...

...project I've accomplished was creating a predictive model for the number of approved non-immigrant visas in the US.


  • Oracle Developer

    2018 - 2019
    • Worked on migration projects and investigated production issues.
    • Collaborated with the business team which included gathering business requirements and developing a rules engine.
    • Created testing strategies to ensure the quality of the application and reviewed test cases to ensure alignment with business requirements.
    • Contributed to the identification of poor performance areas and worked on process improvement.
    • Mentored the offshore team and encouraged teamwork.
    • Helped in the creation of charts/reports using Tableau to aid the business team.
    Technologies: Tableau, Autosys, Unix, PL/SQL, SQL, Oracle
  • Trading Platform Maintenance

    2018 - 2019
    Conspecta Capital (via Toptal)
    • Debugged the macro code and fixed the broken links which helped the application to run again in production.
    • Proposed and added new functionalities to improve the application.
    • Removed processes that were not used anymore resulting in a 2x improvement in run time.
    Technologies: Visual Basic for Applications (VBA), Macros
  • IT Analyst

    2011 - 2013
    Citi Bank via Tata Consultancy Services
    • Led the applications team, CITI Client First, in developing a collections application for CITI Bank.
    • Supported the back end of the CITI Client First application of CITI Bank.
    • Automated the conversion of file templates using Excel VBA, which were previously converted manually.
    Technologies: Excel VBA, Autosys, Unix, Oracle
  • Oracle Developer

    2008 - 2011
    Bank of America via Tata Consultancy Services
    • Created the back end of an anti-money laundering application.
    • Migrated ETL data from various applications to the AML application at Bank of America.
    • Proposed process improvements that reduced the run time from two hours to ten minutes.
    • Automated and improved the process of running test scripts from Excel directly in Oracle for Merrill Lynch.
    Technologies: Autosys, Unix, Oracle PL/SQL, Oracle


  • Complete IZ0-061 Oracle 12c Fundamentals Certification

    This exam has been validated against Oracle Database I completed this exam 12/16.

  • Active Member on Stack Overflow

    I love to solve technical problems, and I have learned a lot as an active member.

  • Active Member with Hacker Rank

    I like challenges and enjoy participating in HackerRank challenges.

  • B2C Application with Oracle Backend

    I have created backend to store information received from B2c Application, stored procedures that will insert Company & subsidiary information, create a read replica of the Database, Backup retrieval for every two hours. In addition to that, I have also created three reports using sql queries

  • A Predictive Model for the Number of Approved Non-immigrant Visas in the US

    This project aimed to predict the number of non-immigrant visa issuances for any predetermined country and any predetermined visa type. In order to solve the problem proposed above, we attempted to predict the number of visa issuances by analyzing the trends of different non-immigrant US visa types worldwide. In summary, we compared three different machine learning models to select the most accurate one and made predictions for future years using the chosen model.


  • Languages

    SQL, Excel VBA, Visual Basic for Applications (VBA), JavaScript, Python, Java
  • Platforms

    Oracle, Linux, Unix, iOS
  • Storage

    PL/SQL, Oracle PL/SQL, MySQL, SQLite
  • Other

    Excel Macro, Google BigQuery, Macros, Machine Learning, Engineering, Excel Macros, Regression Modeling, Data Structures, Electronics
  • Tools

    Autosys, Tableau Desktop Pro, Tableau, Cron, Microsoft Excel, Git
  • Paradigms



  • Master of Science Degree in Data Science
    2021 - 2021
    University of West Florida - Florida, USA
  • Bachelor of Engineering Degree in Electrical and Electronics Engineering
    2004 - 2008
    Thiagarajar College of Engineering - Madurai, India


  • Oracle 12c Fundamentals

To view more profiles

Join Toptal
Share it with others