Jack Xu

Senior Software Developer @ VCA Software

About

With 20 years of software development experience, I specialize in building enterprise-grade applications and optimizing mission-critical systems. My technical foundation includes .NET (ASP.NET Core, MVC, Blazor), SQL, ColdFusion, and modern JavaScript frameworks like Angular and React, supported by deep expertise in full-stack architecture and legacy modernization. I’ve completed projects that modernized legacy platforms, improved system performance, and delivered scalable, secure solutions in complex business environments. I thrive on solving challenging problems and delivering clean, maintainable solutions that stand the test of time.

Country

Canada

City

Toronto

Industry

Information Technology & Services

Skill

Swagger API, Serilog, JSON, Blazor, C#, Postman API, LESS (Stylesheet Language), Software as a Service (SaaS), Databases, .NET Core, ASP.NET Core, Representational State Transfer (REST), ASP.NET MVC, Transact-SQL (T-SQL), .NET Framework, SQL, Scrum, PostgreSQL, xUnit, React.js

Experience

Senior Software Developer

VCA Software

2025-9 - 2026-4 · 8 mos

Bolton, ON

- Modernized enterprise insurance systems, including a Windows virtual printer platform, legacy web applications, and cloud-based document processing services across Azure and AWS. - Key Contributions: · Modernized a Windows virtual printer application by migrating from PostScript to XPS using .NET 8, enabling secure document capture, PDF generation, previewing, and cloud upload (AWS S3 / Azure Blob Storage). · Implemented hybrid authentication using Azure AD B2C (custom policies), Okta SSO, MSAL, and Azure Key Vault for secure enterprise access across legacy and modern systems. · Rebuilt and extended RESTful APIs supporting claims processing, document management, and third-party integrations. · Migrated legacy VBScript/Classic ASP web applications to Blazor, improving maintainability, performance, and user experience. · Developed high-volume document processing system handling 17,000+ files using multithreading and parallel processing with automated metadata-driven workflows. · Resolved production issues and delivered ongoing improvements across applications.

Senior Programmer

Descartes Systems Group

2019-2 - 2024-12 · 5 yrs 11 mos

Toronto, ON

- Developed and maintained the Descartes Visual Compliance suite of web and Windows applications, ensuring optimal performance and user satisfaction. - Optimized multithreading processes to enhance CPU utilization and improve application performance. - Delivered key projects: · Built RPS Utilities Admin tools with seamless UI/database integration for content management. · Developed user account management systems with SSO login, reCAPTCHA, and responsive web design. · Developed robust web service APIs to encapsulate business logic, ensuring modularity and ease of maintenance. · Updated Visual Compliance websites to adhere to VPAT (WCAG 2.1 AAA) guidelines and Netsparker security standards, addressing OWASP Top 10 vulnerabilities including XSS, data breaches, and SQL injection. · Modified and upgraded the Dynamic Screening Management application, transitioning from WMI to PowerShell.

Web Application Developer

MSR-eCustoms Inc.

2009-12 - 2019-2 · 9 yrs 3 mos

Toronto, Ontario, Canada

- Designed and developed enterprise-level web applications with improved security and performance. - Key achievements: · Rebuilt Visual Compliance websites with responsive design and optimized SQL queries. · Designed and deployed optimized web content management and data administration solutions, reducing processing times and improving data accessibility. · Developed a new tariff hierarchy structure and optimized tariff search algorithms, significantly enhancing the performance of the Visual Tariff website. · Automated data extraction and parsing for U.S. Customs Rulings, the Harmonized Tariff Schedule of the United States, and the Canadian Tariff Schedule. · Delivered iPad-compatible Visual Compliance solutions using Ext JS Sencha Touch. · Automated US rulings data extraction and database updates. · Created weekly advertisement click-through summary reports to analyze performance and support marketing strategies for eCustoms websites.

Web Application Programmer

ZOOMER

2007-4 - 2009-12 · 2 yrs 9 mos

Toronto, ON, Canada

- Developed and optimized ZoomerMedia’s dynamic websites and custom CMS systems to enhance performance, scalability, and user experience. - Major projects including the rebuilding of zoomermedia.ca, 50plus.com, and carp.ca, as well as the creation of microsites for Royal LePage Real Estate, BaxterTeam, and Investment Planning Counsel. Developed the AM740.ca Live Video Switch System.

Software Developer

Burntsand

2007-2 - 2007-3 · 2 mos

Toronto, ON, Canada

- Enhanced system reporting for the Ontario Energy Board using Crystal Reports and SQL. - Created and modified Crystal Reports using Formulas, Parameters, Selection Criteria, Cross-tab, Conditional, Drill-down, Top N, Summary, Form, OLAP, and Sub-reports. Designed and optimized SQL queries for report generation.

Program Analyst

Toronto Hydro

2005-12 - 2006-6 · 7 mos

Toronto, ON, Canada

- Upgraded ERP system reporting capabilities with Crystal Reports. - Migrated Crystal Reports from version 8.5 to version 10. - Created Crystal Reports using Formulas, Parameters, Selection Criteria, Cross-tab, Conditional, Drill-down, Top N, Summary, Form, OLAP, and Sub-reports. - Developed Views and Stored Procedures to support report generation. - Published and scheduled reports to run monthly, automatically emailing results to users in the required format. - Conducted system functional and unit testing using Java to ensure accurate report functionality.