Software Developer in Hanoi, Vietnam

Almost right after joining MCB, as the lead developer, within 9 months I have successfully built a new version of our eCommerce platform using ASP.NET MVC and React as a drop-in solution. The new version is so flexible, stable and faster that almost 80% of our existing customers have decided to upgrade to new version. Besides, we have also succeeded in selling for 5 more big B2B customers.

By adding more unit/automation tests, pair reviewing/programming refactoring and mentoring to build high-quality code, we have reduced support hours by 50% not only on the new versions but also on old versions of our e-commerce platform.

We have been tuning performance using RedGate ANTS profiling tools, using DI (Dependency Injection), caching, dynamic bundling, lazy loading, asynchronous loading to help increasing throughputs up to 45% and optimizing page loads by more than 60% to be around < 1s in average on all online shops.

Leading a team of 3 core and senior developers, I built a completely new version of ChangeDriver from scratch to bring it from a Desktop-based application to a cloud-based SaaS (Software as a Service) running on AWS.

I made it possible to embed Microsoft Office Applications such as Visio, Word, and Excel using C++/COM+/ActiveX to allow process owners to use ChangeDriver Editor as a unified tool/application for building their organization blueprints.

Based on WIF (Windows Identify Foundation) and with AD FS (Active Directory Federation Services), I was able to add SSO (Single-Sign-On) to ChangeDriver multi-tenancy system supporting federation with customer corporate networks, LinkedIn, Google, SharePoint.

Using ChangeDriver, organizations usually publish their blueprints for their employees to understand their processes and execute them accordingly. In order for being able to handle multiple large publications concurrently, I developed an auto scale-out publishing system with AWS EC2 CLI, WCF, .NET 4.0 multi-threading techniques.

I also created several powerful RESTful APIs to serve the data to not only present publications to organization employees but also to allow integration with organizations' ERP systems.

Within 3 and a half years, as offshore development lead most of the time, I was able to reach 90% of milestones throughout the project.

By using WCF (Windows Communication Foundation), SOAP/XML, self-made ESB (Enterprise Service Bus), we did build up a very flexible, highly scalable SOA (Service-oriented Architecture) system that helped property owners to easily enter vacation houses; contract partners to define flexible and multi-level pricing systems; end-users to search and book vacation houses through our load-balanced web applications; and reseller partners to do bi-directional synchronization with Vacasol databases.

For the last 1 year within the project, I did tune the performance a lot to allow loading property detail page and searching thousands of houses in less than 3 seconds.