[Mobile Telephony communication system development expert] In the past 20 years, My career has been focused on developing Mobile Telephony System. Especially I worked for Telcoware and Eluon Corp. Both companies are topmost Telephony Solution companies in Korea. So, I was able to pile up my great career at those companies. And I was able to have comprehensive and extensive knowledge in Mobile Telephony communication field and have abundant system design experience and practical development experience.The core of the transport network layer is the EPC system, and the core of the communication network layer is the CSCF server. I am a professional mobile communication developer with experience in developing both EPC and CSCF in Korea.Also, I developed using all communication protocols such as SIP, HTTP2, S1AP, NAS, Diameter, GTP-C/U, WebRTC, RTP/SRTP/RTSP, SS7, MEGACO.SKT, KT and LGU+ Corp. in Korea are my main customers.It was my job to collect and analyze customer requirements and to design and develop the best solutions through continuous conversations with customers to satisfy them. In addition, when a problem occurred in the Solution I developed, I quickly analyzed the cause of the problem and explained it to the customer, and quickly provided a patch solution to build trust from customers. Plus, I have been a Project Manager and Main Developer since I was a junior developer, So, I am very good at analyzing 3GPP documents and RFC documents. Over the past 15 years, I have written dozens of RFI and RFP responses for 3 major domestic Telecoms in Korea and overseas Telecom companies. And Recently, I wrote a KT 5G Charging Function (CHF) Proposal and an LGU+ 5G SMSF RFP answer.I also follow recent Telecom market Trend. And 3 Major telecom companies in Korea are looking for new killer service through 5G. In order to realize these 5G services, 5G Edge-Cloud Technology is essential and needs SDN, NFV, 5G Network Slicing Technologies. And SR-IOV, VxLAN, and DPDK technologies are required to implement NFV. I developed the LGU+ NB IoT CSGN EPC System. CSGN EPC was developed based on Open Stack NFV. And We used SR-IOV, VxLAN, and DPDK technologies for NFV. Like this, I have the experience and knowledge of the essential technologies required for 5G Edge-Cloud technology. Development Language : C, C++, Java, Python, Java Script, Node.js etcDevelopment Protocol: 5G HTTP2, S1AP, NAS, Diameter, GTP-C/U, SIP, SS7, RTP/RTSP, MEGACO, PRI, R2 etcDatabase : Memory DB, Orable DB, MySQL, MongoDB, Redis