• Successfully migrated legacy applications from .NET Framework to .NET 6 WinForms, resulting in a 50% increase in production performance and a 30% decrease in defect rates.• Implemented parallel processing and asynchronous techniques to improve overall system performance by 30%.• Refactored code following SOLID principles and applied rigorous testing strategies, resulting in a 60% improvement in product quality and reliability.• Leveraged automation and digitalization to enhance business workflows by 80%.• Enhanced data security using the AES-256 algorithm to protect client data.• Developed a multi-tenant platform using C#, .NET 6 Web API, Angular 11, Bootstrap, TypeScript, and SQL• Managed code changes and production deployments through CI/CD using Azure DevOps

• Taking full ownership of developing .NET web applications used internally at a worldwide company by employees located around the world• Working on UI, business logic, integrating with external system, unit testing, production deployment, maintaining and upgrading web applications, and bug fixing.• Communicating with US team to collect and analyze requirements, to propose plans and estimates to get approvals from the client.

• Take the key technical role in the support team to maintain and enhance product on-live, manage configuration and application in 3 environments (Production, QA, shared DEVs), investigate and fix issues happening in the environments, to be ready for 24/7 if any urgent issue happens in Prod, and communicate with client for requirements and other onshore teams such as hosting team, network team, DB team for issues happening.• Review and analyze the code and the system to propose, design and implement solutions to enhance the system’s performance.• Working onsite in USA from October 2011 through February 2012 and from May 2013 through February 2014 to incorporate with the customer’s teams in resolving the system’s defects, implementing new features and being a contact point between onsite team and offsite team.