Charles Lee, Developer in New York, NY, United States

Charles Lee

Query Optimization Developer

New York, NY, United States
Toptal Member Since
June 18, 2020

Charles is an application and database developer with more than 5 years of experience. He has been the database owner of multiple products—including an automation tool used extensively in asset management at JPMorgan Chase and a bank deposits pricing tool with 20+ clients and more than $1 billion under analysis.

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Windows PowerShell, Sublime Text, Subversion (SVN)...
JPMorgan Chase
Informatica, Oracle, Visual Studio, SQL Server Management Studio...


T-SQL (Transact-SQL) - 5 yearsMicrosoft SQL Server - 5 yearsPerformance Optimization - 4 yearsQuery Optimization - 4 yearsOperations Research - 4 yearsBlockchain - 1 yearPython - 1 year


New York, NY, United States



Preferred Environment

Spyder, Sublime Text, SQL Management Studio, Windows

The most amazing... I considered recently was a joint venture to buy a Bitcoin ATM and put it in a high-traffic area in New York City or India.

Work Experience

2014 - 2017

Senior Database Developer

  • Worked as the database owner of a bank deposits analytics dashboard with 20+ clients and more than $1 billion in total assets under analysis.
  • Helped a triple-client base and assisted an international expansion by maintaining a master version of the SVN code repository and synchronizing the shared code across all clients and environments.
  • Coordinated the database deployments of bi-monthly UI releases across 5 time-zones and multiple servers.
  • Developed new features, enhancements, utilities, and bug fixes—e.g. improved the accuracy of tracking CD renewal balances.
Technologies: Windows PowerShell, Sublime Text, Subversion (SVN), SQL Server Management Studio, Microsoft SQL Server
2011 - 2013

Application Developer

JPMorgan Chase
  • Led the development of a technology cost savings initiative that was promoted globally and led to $3 million in savings for asset management in 2012.
  • Brought transparency to recurring and erroneous technology charges via monthly billing to all asset management end-users.
  • Led the development of a suite of email-based automation tools used firm-wide—15,800 distinct users and 116,000 transactions processed in 2012.
  • Owned the Informatica ETL process and Oracle PL/SQL algorithm that allocated server-level costs to individual applications based on usage.
Technologies: Informatica, Oracle, Visual Studio, SQL Server Management Studio, T-SQL (Transact-SQL), Subversion (SVN), VB.NET, C#, Microsoft SQL Server


Personal Website | Hugo on GitHub Pages
This GitHub repository contains both the code for my personal website (master) and the files built using Hugo (GitHub-pages).

Steem Upvote Bot | Python and Heroku
Steem is a blockchain-based, social news platform where posters and upvoters, i.e. curators, are rewarded directly with cryptocurrency. This is a guide to creating a simple bot that will periodically upvote a random post on the Steem blockchain.



SQL, T-SQL (Transact-SQL), Python, VB.NET, C#, Visual Basic .NET (VB.NET)


Databases, Microsoft SQL Server, SQL Server Management Studio, PL/SQL, PL/SQL Developer, Oracle PL/SQL, PostgreSQL, SQLite, MySQL


Freelancing, Software Development, Blockchain Development, Performance Optimization, Operations Research, Query Optimization, Informatica, Algorithms, Machine Learning, Data Structures, Bitcoin, Deep Learning


Windows PowerShell


Scikit-learn, SciPy, NumPy, Pandas


SQL Management Studio, Spyder, Visual Studio, Subversion (SVN), Sublime Text, Sublime Text 3, Notepad++, Git, Jira, MATLAB


Windows, Oracle, Blockchain


2007 - 2011

Bachelor of Science in Operations Research

Cornell University - Ithaca, NY, USA