Professional Summary

Senior .NET Backend Engineer with 10+ years of experience in enterprise system integration (SI), in-house ERP platforms, and large-scale B2B solutions. Specialized in ASP.NET Core, MSSQL, Oracle, Mysql, optimization, RESTful API design, and scalable multi-tenant architectures. Proven experience supporting 500+ enterprise clients across logistics, education, sports, and ERP industries.

Technical Skills

Enterprise System Integration (SI)

Doosan – Document Security System

Role: Backend Developer (.NET)
Tech: ASP.NET Core, C#, MSSQL, Azure
- Developed secure document access control modules
- Implemented encryption and RBAC authentication
Impact: Reduced security incidents and improved processing performance by 25%

Samsung SDS – EFSS Security Solution

Role: Backend Developer
Tech: .NET Framework, MSSQL
- Maintained enterprise file-sharing security system
- Optimized system stability and performance
Impact: Improved system reliability and reduced downtime

Enterprise Solution & ERP Platforms

Golf ERP Platform (500+ B2B Clients)

Role: Full Stack Developer
Tech: ASP.NET, C#, MSSQL, REST API
- Developed booking, scoring, MIS, and ERP modules
- Integrated Weather API for 250+ clients
- Designed scalable multi-tenant database architecture
Impact: Reduced response time by 30%, supported 500+ active enterprise customers

Weather API Integration

Role: Backend Engineer
Tech: REST API, JSON, MSSQL
- Integrated government weather data into ERP systems
- Implemented caching to reduce API cost by 18%
Impact: Increased system reliability across 250 client companies

In-house System Development

MegaStudy Education Group – LMS & Backoffice

Role: In-house Backend Developer
Tech: ASP.NET MVC, MSSQL
- Developed LMS platform and internal backoffice systems
- Built HR and student management modules
Impact: Improved internal workflow efficiency

Ilyang Logistics Group – Logistics & Tracking Systems

Role: Backend Developer
Tech: .NET Framework, MSSQL
- Built shipment tracking API for enterprise clients
- Developed internal logistics and HR systems
Impact: Enabled real-time shipment tracking and API service integration

Additional Projects