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Jeffrey Mangasarian

@jeffreymangasarian

Senior Engineer at IL Department of Commerce and Economic Opportunity - SIU, adding Angular 19 and .NET Core 9 features.

United States

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What I'm looking for

I’m targeting a Technical Lead or Senior development role focused on full-stack cloud web development for banking, medical, logistics, and related industry applications.

At IL Department of Commerce and Economic Opportunity - SIU, I’m adding Angular 19 features and developing the C# .NET Core 9 backend. I’ve also ported hundreds of DB2 tables to a SQL Server staging area and started work on migrating data into the application database.

At IL Dept. Children & Family Services, I worked on Foster Care Claims and AHU applications, including building a reusable application framework and a generic report system for PDF and CSV output. As Senior Team Lead on AHU, I directed four development engineers and two QA engineers and mentored the team through pair programming and debugging.

Earlier, at PEAK6 Investments, I developed and architected a microservices Databus used across PEAK6 and its subsidiaries, and managed the company-wide conversion to the OCC Options Symbology Initiative. My work has also included banking, financial applications, logistics, and wireless security products.

Experience

Work history, roles, and key accomplishments

Current

Senior Engineer

Current

IL Department of Commerce and Economic Opportunity - SIU

Jul 2024 - Present (2 years 3 months)

Developed Angular 19 frontend and C# .NET Core 9 backend features, ported DB2 tables to SQL Server, and integrated Azure Cloud with Okta authentication.

Angular TypeScript C#.NET Core SQL Server Azure Okta Hangfire Azure DevOps Git Claude Code ChatGpt Grok

Senior Team Lead

IL Dept. Children & Family Services

Jun 2023 - Jun 2024 (1 year)

Led a team of 4 engineers developing React and C# .NET Core applications, built a generic repository layer, and deployed to Azure Cloud.

React C#.NET Core Azure SQL Server Bootstrap Okta Azure Scrum Mentorship Claude ChatGpt

Senior Contractor

M&T Bank

Oct 2021 - May 2023 (1 year 7 months)

Developed Angular 11 and C# .NET Core backend for a 401(k) retirement application, integrated DocuSign, and migrated to Azure using Docker and Kubernetes.

Angular TypeScript C#.NET Core Entity Framework SQL Server S3 Docusign Aspose NUnit Docker Kubernetes Gitlab ChatGpt

Senior Contractor

RealPage

Jun 2021 - Sep 2021 (3 months)

Developed C# Web API and React frontend for credit card and ACH integration with CyberSource and Jack Henry in a microservices environment.

C#.NET Core React CyberSource Jack Henry Microservices Git Docker Bitbucket

Senior Software Engineer

Echo Global Logistics

Oct 2020 - Jun 2021 (8 months)

Full-stack engineer on EchoShip, added SSO with OneLogin, and built AWS Lambda microservices with Docker and Kubernetes.

C#.NET Core Angular TypeScript OneLogin AWS Lambda Docker Kubernetes Git Azure DevOps

Senior Contractor

Neuberger Berman

Jun 2020 - Oct 2020 (4 months)

Backend development using C# on Azure and Python for custom ETL processing steps in a configurable UI tool.

C#Azure Python ETL REST APIs Web Services

Senior Contractor

Focal Systems

Nov 2019 - Mar 2020 (4 months)

Full-stack web developer on Google Cloud for store shelf monitoring applications, using Angular, Node.js, Python, and MongoDB.

Angular TypeScript NodeJS Python MongoDB MySQL GraphQL Google Cloud Platform Docker Kubernetes

Senior Contractor

Canadian Imperial Bank of Commerce

Nov 2018 - Sep 2019 (10 months)

Full-stack web developer on C# MVC 5 banking applications, with frontend in jQuery and backend using Entity Framework and SQL Server.

C#MVC jQuery JavaScript HTML JSON AJAX CSS Entity Framework SQL Server

Application Architect

American Academy of Orthopaedic Surgeons

Dec 2017 - Oct 2018 (10 months)

Designed .NET MVC 5 solutions, architected SSO with PingFederate, and worked on Angular and Xamarin applications.

.NET MVC SSO Ping Federate Identity Java C#Angular TypeScript Xamarin AWS SSIS

.NET Developer

Nuveen

Oct 2016 - Dec 2017 (1 year 2 months)

Developed financial website features using C# .NET MVC 5, JavaScript, and SQL Server, including reports and maintenance pages.

C#.NET MVC JavaScript SQL Server Stored Procedures

.NET Developer

KAR Auction Services

Apr 2016 - Oct 2016 (6 months)

Sole developer on Angular website for vehicle venue selection, using AngularJS, C# Web API, and SQL Server on Azure.

AngularJS Bootstrap C#.NET Web APIs SQL Server Azure OAuth SSL PostgreSQL

Contractor

Kershner Trading

May 2016 - Sep 2016 (4 months)

Sole developer on Linux C++ stock trading system, fixing order strategy features and adding error handling.

Linux C++STL LimeTrading API

Contractor

Encore-US

Feb 2016 - Apr 2016 (2 months)

Sole developer on Angular website for hotel rigging requests, built with AngularJS and Web API, deployed on Azure.

AngularJS Bootstrap HTML JavaScript JSON C#.NET Visual Studio

.NET Contractor

ABN AMRO Clearing

Nov 2014 - Feb 2016 (1 year 3 months)

Team lead on AS/400 to C# .NET porting project, using Kanban and Agile, with SSIS packages for ETL.

C#.NET Kanban Agile SSIS SQL Server IBM MQ FIX QuickFIX JSON

.NET Contractor

Bank of America

May 2013 - Nov 2014 (1 year 6 months)

Led team building ASP.NET MVC 4 application and developed Windows services for financial settlements.

ASP.NET MVC AJAX jQuery C#SQL Server Oracle Windows Services IBM MQ LINQ JSON HTTP NUnit MSTest Spring Framework Jenkins

.NET Contractor

Abbott/AbbVie

Nov 2012 - Apr 2013 (5 months)

Completed ASP.NET project with Oracle backend and started new MVC 4 project for protein management.

ASP.NET Oracle MVC jQuery Web Services

.NET Contractor

Iron Financial

Jul 2012 - Oct 2012 (3 months)

Maintained mutual fund website and created applications for Bloomberg data and ticker tracking.

C#ASP.NET SQL Server jQuery DataTables JavaScript SSIS Bloomberg

Independent Contractor

Feb 2012 - Jun 2012 (4 months)

Created gamma scalping application for equity options and a content management website for a client.

C#.NET TradeKing API FIX PHP MySQL HTML JavaScript jQuery PayPal

Senior Engineer

Nico Trading

Jan 2011 - Jan 2012 (1 year)

Designed and developed data feeds and FIX order management gateway software, including the entire GovEx trading system.

C++C#SQL FIX Data feeds CME ICE CBOE NASDAQ OPRA EUREX GOVEX

Manager / Architect

PEAK6 Investments

May 2004 - Dec 2010 (6 years 7 months)

Managed and architected microservices Databus system for data feeds, developed market-making systems, and led OSI conversion project.

C C++C#Microservices UDP PGM 29West LBM FIX QuickFIX SQL Server Windows Linux

Senior Engineer

AirMagnet

May 2002 - May 2004 (2 years)

Worked on wireless sniffer security tool, created Reporter product, and built distributed enterprise sniffer.

C++MFC CoM Crystal Reports SQL Server MS Access Linux

Senior Engineer / Manager

ModelN

May 2000 - May 2002 (2 years)

Held senior engineer and manager role at ModelN.

Senior Engineer

Gettoday.com

Feb 2000 - May 2000 (3 months)

Senior Engineer at Gettoday.com, which shut down.

Senior Engineer / Project Lead / Project Manager

Network General / Network Associates

Jun 1997 - Feb 2000 (2 years 8 months)

Held senior engineer, project lead, and project manager roles at Network General, which was bought out.

Senior Software Engineer / Technical Lead

CENTER VIEW

Feb 1996 - Jun 1997 (1 year 4 months)

Senior Software Engineer and Technical Lead at CENTER VIEW, a startup later bought by Informix.

Senior Software Engineer / Team Lead

AXON INSTRUMENTS

Jun 1995 - Feb 1996 (8 months)

Senior Software Engineer and Team Lead at Axon Instruments.

Education

Degrees, certifications, and relevant coursework

University of Wisconsin-Madison

Bachelor of Science, Computer Science

Bachelor of Science in Computer Science from the University of Wisconsin-Madison.

Tech stack

Software and tools used professionally

Availability

Looking for a job

Location

United States

Authorized to work in

United States

Salary expectations

150k+ USD

Job categories

Full Stack Engineer Technical Lead

Skills

Fullstack Development Cloud Application Development C#.NET Core Angular TypeScript React NodeJS C++Java SQL Python ASP.NET MVC Web APIs Microservices

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Jeffrey Mangasarian

What I'm looking for

Experience

Senior Engineer

Senior Team Lead

Senior Contractor

Senior Contractor

Senior Software Engineer

Senior Contractor

Senior Contractor

Senior Contractor

Application Architect

.NET Developer

.NET Developer

Contractor

Contractor

.NET Contractor

.NET Contractor

.NET Contractor

.NET Contractor

Independent Contractor

Senior Engineer

Manager / Architect

Senior Engineer

Senior Engineer / Manager

Senior Engineer

Senior Engineer / Project Lead / Project Manager

Senior Software Engineer / Technical Lead

Senior Software Engineer / Team Lead

Education

University of Wisconsin-Madison

Tech stack

Availability

Location

Authorized to work in

Salary expectations

Job categories

Skills

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