Responsible for building a fast growing development team.Guided the 4 devs to have exceptional code quality and system observability.Mentored engineers' career growth.

Provided admin dashboard with Vue and React JS.Introduced Typescript with best practices.Introcuded composition api with vue 2.7 as backported features.

Launched Firewall Manager portal in Azure Hybrid Network team.Implemented the UIs of business critical operations - multi PIPs, TI whitelist and automated route tables in KnockoutJS.Automated E2E testing intra-structure.Launched Firewall Premium in Azure Hybrid Network portal: https://azure.microsoft.com/en-us/blog/azure-firewall-premium-now-in-preview-2/

Built message-driven architecture with Azure Event Grid, Service Bus, REST APIs in Azure Functions.Converted marketing and transactional emails (cancel email, newsletter subscriptions and so on) to html version using Oracle Responsys. Built messaging APIs with service bus to guarantee delivery. It sends payloads to Oracle Responsys written in C# Net Core.Enhanced Check-In email for more personalization in a batch process written in C# Net Framework.Added Known-Traveler-Number to m.alaskaair.com, the mobile web application in C# and JavaScript.

Captured user-behavior in www.alaskaair.com to Azure Data Lake. Implemented the entire pipeline in JavaScript and C# Net Framework, working with middleware and architect teams.Built an internal scheduled app to clean up and cancel test bookings in NodeJS and Azure Functions.Re-built the legacy MVC calendar page in ReactJS. Leaded the project, learned as team and launched before Cyber Monday. Increased shopping-to-booking conversion ratio.Maintained the main shopping engine in C#, Service Fabric and Docker, working with business, Google ITA and Sabre.Fully automated www.alaskaair.com build/test/release in Azure DevOps in PowerShell.Enhanced A11y of www.alaskaair.com in C# and JavaScript. Helped engineers by providing a dynamic analysis tool in JavaScript, warning them any mistake in development times

Migrated legacy Java web applications to C# .NET Framework with a vendor.Leaded, prioritized and developed web solutions – Responsive web design, WCF Services, MVC4 Web RESTful API – using ASP.NET MVC 4, C#, jQuery and SQL Server.Developed, supported, and enhanced ASP.NET, Classic ASP web applications interfaced with an Oracle based ERP system. Designed WCF Services, MVC4 Web API based restful service.Design, develop and support web and Win Forms applications for various clients utilizing VB.Net, C#, Web Services, SQL Server 2005, Stored Procedures, HTML, CSS and JavaScript

Designed and analyzed Language Models for natural language productsImplemented natural language software in C/C++Developed Korean<>English online dictionaryDeveloped Korean input system with 12 keypads and Hangul Transcription system of foreign words