C# .NET Mysql Mssql Developer

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Joven Villestas

Jamaica, NY *****

929-***-****, ***.*********.****@*****.***

Summary

I am a Freelance Software Developer and Consultant with over 25 years of hands-on experience in full-stack software development, specializing in C#, Microsoft SQL Server, MySQL, and JavaScript. My career has spanned the creation of robust, custom-built systems across diverse industries including Finance, Distribution, Warehousing, Manufacturing, Payroll, Human Resources, Scheduling, GPS Tracking, SEO Automation, and QuickBooks Pro Integration. My technical expertise centers around C# and the .NET framework, where I have designed and developed scalable client-server and web-based applications. I have deep proficiency in MS SQL Server and MySQL, managing complex data structures, stored procedures, performance tuning, and database- driven applications in both Windows Server and Linux (Red Hat/Ubuntu) environments. I am also skilled in JavaScript for interactive front-end development, with experience integrating it alongside ASP.NET, HTML, and other web technologies. My broader toolkit includes Visual Basic (4.0– 6.0), ActiveX, ADO, OLE DB, XML, Crystal Reports, and administration of Sybase databases on the Sun Solaris Unix platform.

Whether building new systems from scratch or modernizing legacy applications, I bring a results-driven approach with a strong emphasis on performance, maintainability, and business alignment. Immigration Status: Permanent Resident (Green Card Holder) Technical Skills

Programming & Frameworks: C#, .NET Framework/Core, VB.NET, MS Visual Studio, Java, PHP, HTML, XML, Unix/Linux Shell Scripting, Python (basic), VBScript.

Databases: Microsoft SQL Server, MySQL, Microsoft Access, Sybase.

Cloud & Platforms: Microsoft Azure, IIS, Apache Web Server, Joomla (CMS).

Reporting & Tools: Crystal Reports, Microsoft Office Suite, Adobe Creative Suite, QuickBooks

(Desktop & Online).

Operating Systems: Windows (all versions including Server), Ubuntu Linux, Red Hat Linux, Solaris, macOS.

Hardware & Infrastructure: Enterprise servers (IBM X-Series, Sun Fire), PC systems, MacBook Pro, Barcode/PC readers.

Legacy / Historical Experience

Programming & Frameworks: Visual Basic 6.0, FoxPro, MS Access Basic, Perl 5.0.

Operating Systems: Windows NT, Novell, Sun Unix OS, Red Hat Linux 8.0, Mac OS Leopard.

Networking & Middleware: ODBC, JDBC, OLE DB, ADO, DCOM, COM, IIS 4.0, TCP/IP, FTP.

Reporting & Tools: Lotus SmartSuite, Crystal Reports 7–9, ASP (classic). Work History

C# Programmer / Developer (Per Project, Remote / On-Call) NNJEMS – New Jersey

July 2015 – Present

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Designed, developed, and continue to maintain a 24/7 real-time EMS data integration and reporting system for GPS-enabled emergency vehicle tracking.

Built automated workflows to extract and transform GPS data from Microsoft SQL Server into structured XML formats.

Implemented secure data transfer pipelines to remote MySQL servers and automated FTP uploads for reporting and external integrations.

Leveraged C#, .NET, ActiveX, and VB6 components to enable legacy compatibility while ensuring scalability with modern technologies.

Integrated Crystal Reports and MS Access for dynamic, legacy-compliant reporting solutions.

Delivered a mission-critical system that ensures continuous, reliable, and efficient data flow supporting emergency response tracking and analytics. System Developer / Analyst

UP High Capital Management Inc. / MCS, New York, NY Jan 2020 – Dec 2023

Designed and implemented the UPHIGH Enterprise Solution System, a comprehensive platform supporting client, investor, property maintenance, and investment management operations.

Built centralized modules for Client & Investor Management, streamlining account tracking, communications, and profile data.

Developed Property Maintenance Tracking features to schedule, monitor, and report vendor activities, costs, and upkeep tasks.

Created Investment Portfolio Monitoring dashboards with real-time insights into ROI, capital contributions, and distribution schedules.

Integrated Crystal Reports for dynamic reporting on investor summaries, property performance, and financial projections.

Delivered cross-platform integration (Windows & Linux) by leveraging C#, PHP, SQL Server, MySQL, and ActiveX components for seamless data exchange.

Improved operational efficiency, enhanced data accuracy, and increased investor transparency across the firm.

C# Programmer / Developer

DORN (Division One Restoration Network) Inc., Long Island, NY Nov 2011 – Dec 2013

Designed and enhanced SEO/blogging software with advanced XML integration to support multiple websites.

Built and maintained a multi–virtual machine automation system for real-time generation of marketing blogs and write-ups.

Optimized and refactored existing codebase, improving system stability, scalability, and overall performance.

Implemented upgrades and custom coding for the company’s PBX Asterisk system, strengthening communication infrastructure.

Worked with a wide range of technologies, including C#, .NET, VB6, PHP, Java, MySQL, Crystal Reports, MS Access, Linux, and Windows environments. System Analyst / Developer

Rappha Health Care Inc., Miami, FL

March 2003 – Nov 2011

Designed, implemented, and maintained the organization’s enterprise system (v1.0.0 / v2.0.0), covering HR, Scheduling, Payroll, Accounting, and reporting modules.

Configured and deployed the full IT infrastructure, including servers, operating systems, databases, and network cabling.

Migrated core applications from Visual Basic 6.0 to .NET C#, enhancing scalability and long-term maintainability.

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Developed reusable classes and components, reducing redundant code and improving system efficiency and developer productivity.

Utilized a broad range of technologies, including C#, .NET, VB6, PHP, Java, MySQL, Crystal Reports, MS Access, Windows, Red Hat Linux, and Sun Solaris. VB Developer / Analyst

Burger King Corporation, Miami, FL

Jan 2001 – Apr 2001

Designed and developed a reporting module (ProcRepExe) for the POS Compris System, deployed across all restaurant locations.

Built an executable to extract data from the OLE server (Btrieve) via ActiveX control and generate XML data sources.

Implemented HTML-based reporting (e.g., Top 20 Items, Trend Report) to support data-driven decision-making.

Automated XML file management as part of daily end-of-day processes.

Utilized Visual Basic 6.0, VBScript, XML, HTML, Crystal Reports, MS Access, and SQL Server to deliver robust and maintainable solutions.

Other Experience

I.T. Lecturer – Informatics Computer Institute, Manila, Philippines

Delivered classroom and corporate on-site training in programming and database technologies.

Courses included Visual Basic (4.0–6.0), Microsoft Access 7.0, FoxPro 2.5, as well as Financial Bookkeeping and General Accounting.

Education

Bachelor of Commercial Science, Major in Computer Science – Cum Laude Jose Rizal University (JRC), Manila, Philippines — 1995 Professional Training

Fundamentals of Solaris

Shell Programming

Sun Java Programming

SQL Conversion Workbench (DB2)

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