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Mark Tennenhouse

Mark Tennenhouse - C#, ASP.NET, MVC, SQL, JQuery, Microsoft Developer

Senior C# Developer in ASP.NET, MVC, JQuery, SQL, Web Services, WCF.

Real world experience building successful startups.

  • Over 18+ years coding in C#, SQL & ASP.NET.
  • Expert level problem solving & debugging.
  • Extensive background in Angular/Knockout.js, Jquery.
  • Senior level skills in SQL, LINQ & Stored Procedures
  • Seasoned professional software developer with expertise in rapid application development (and redesign) for enterprise and small business. Mark’s extensive background demonstrates a proven ability to take business challenges and turn them into working software for the Web, Mobile devices , Server and Windows platforms.
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A quick summary of my skills.

C# & VB.NET Development
18 years
ASP.NET Development
16 years
MVC Development
10 years
SQL Development
16 years
JQuery & CSS
8 years
Angular/Knockout & Bootstrap
5 years
Front End Development
  • Strong skills in MVVM Development - including Angular/ Knockout.js, Ajax and JQuery
  • Solid experience coding with Javascript and Plugins
  • HTML5 & CSS3 Skills for web, & Mobile Platforms
  • In depth Experience with Bootstrap & responsive design
Middle Tier Development
  • Heavy Object Oriented Development in Multi-Tier Enterprise Applications
  • C#, VB.NET and ASP.NET Framework development from 2.0 to 4.5
  • Extensive experience designing and consuming Web Services and WCF
Back End Development
  • Solid experience coding tables, stored procs and query optimization on SQL Server 2005/2008/2012, MYSQL and Oracle
  • Solid experience using Entity Framework/LINQ to Objects / SQL / XML
  • Coding using SSRS reporting and data transfer tasks

Work Experience

Detailed timeline and descriptions of projects and companies at which Mark has worked.

G4S Secure Solutions
Senior Developer
2015 - Present
Banking and Security provider for Google, Microsoft, HomeDepot, American Express.
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Senior Application Developer
July 2014 - March 2015
Enterprise level Hospital Information System used by approximately 20% of USA hospitals.
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Senior Application Architect/Senior Developer
July 2012 - July 2014
Online Medical Appointment Start-Up
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ADP Corp
Application Architect-Senior Web Developer IV
September 2010 - July 2012
Auto Warranty products for Toyota, Ford, American Bankers...
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Liberty Power Corp
Senior Web Developer
January 2009 - September 2010
Online Electricity Reseller
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Candid Clubs
Senior Web Developer
January 2008- January 2009
Streaming Video Start-Up
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Senior Developer Architect
July 2006 to July 2008
E-Commerce for Cable Reseller
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Lexis Nexus
Contract - Senior Developer
March 2005 to June 2006
Data Mining Company
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Web Architecture Developer
February 2004- March 2005
E-Commerce Media Reseller
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Contract - Senior Web Developer
March 2002 - February 2004
Insurance Provider
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Rexall Sundown
Senior Developer
April 2001- February 2002
Online Vitamin Reseller
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Application Developer
February 2000 -March 2001

Online Mortgage processing
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First Data
Senior Web Developer
February 1998 - January 2000
Credit Card Processing Firm - Visa, Sears, ToysrUs
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A short overview of cool and sophisticated projects completed over the years.

Senior Application February 2014 - March 2015

The Billing department needed a way to easily create emails containing customer information and corporate images for potential customers. I built several features to make this easy and intuitive including: A new section which allows users to drag and drop entire sections and templated form elements, the Print Preview function to display a printed version including patient information from a newly created form, an Undo/Redo function to allow users to go back in history and return to how the form looked previously.

Senior Architect July 2006 - July 2008

Designed, coded and deployed a series of applications that became the primary income for one of the largest Cable resellers in the USA in less than 3 months. Within a single year, sales went from zero to grossing over $200,000 per day

Senior Architect/Senior Web Developer July 2012 - July 2014

Built a large online application to allow a customer to select a doctor and book an online appointment. Moved system to Azure, made it mobile compatible and launched the system.

Application Architect/Senior Developer IV September 2010- July 2012

Completely rebuilt and deployed the core of the company's primary income producing product, a warranty system used by over 2500 auto dealerships for Ford, Toyota, Assurant, GM and other major warranty companies

Senior Web DeveloperMarch 2002 - March 2004

At one of the largest insurance companies in the USA, I led and mentored a team of 10 developers in the coding of reusable components for Translation, Security and validation.

Senior Web Developer January 2009 - September 2010

Worked from a 120 page spec document to architect, and code an application for generate pricing quotes for electricity for large corporations including Walmart.


Here are a few of the projects and companies which are running my code.


If you are interested in discussing how I can help with your project, kindly email, call or Skype me.

Contact Info

Mark Tennenhouse

Boynton Beach, Fl 33436

(954) 818 - 6670