Sungsu Byun

Experience

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  Republic of Korea Navy

  Jun 2003 - Aug 2005

  Network Technician

  - Installed the computer network system and Linux web server in the entire site- Responsible for administering Linux, Sun OS server and security programs - Maintained the computers in the entire site (about 300)- Provided various technical services to maintain network devices- Configured and Installed the CISCO switches and Routers.- Provided network upgrades for improving network performance, reliability and security- Main tools used: Linux, Apache, PHP, MYSQL, WIN2000

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  Adic

  Jul 2007 - Aug 2007

  Software Engineer (Internship Program)

  - Developed the lighting management application based on the LonWorks system to provide significant energy savings in offices, factories and homes- Participated in the 2008 COEX’s conference in order to present the application- Main tools used: Visual Basic, MS SQL

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  B2BInternet

  Nov 2008 - Mar 2009

  Software Engineer

  - Maintain and manage Java Web-based Systems for the Korea Housing Corporation (KHC) - Update the database(DB) in accordance with the requirements of the client company and providethe suitable DB Query - Converse the existing the internet subscription system of KHC which was mixed with ASP and JSPInto the one run only with the basis of JAVA- Mainly used language and DB : JAVA / Altibase, Sysbase

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  Withinterface

  Apr 2009 - Jul 2009

  Software Engineer

  - Develop a human-machine interface (HMI) software which controls the lights with programmable Logic controller (PLC) through the Modbus protocol - Mainly used language and DB : VC++ 6.0

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  ILWOOITS

  Oct 2009 - May 2010

  Software Engineer

  - Development of the controlling program of the automated teller machine (ATM) based on VC++, SQLLITE- Maintenance of managing program of ATM [Dephi 7.0, MSSQL 2005]- Mainly used language and DB : VC++ 6.0 , Delhi 7.0 , MSSQL 2005

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  ON Semiconductor

  Apr 2011 - Oct 2013

  System Engineer

  - Performed preventive maintenance on network equipment based on Win OS- Checked up daily the network equipment to prevent the spread of computer viruses- Configured and Installed the automated systems based on PLC that had improved productivity by 15%- Installed security programs on the computer system- Main tools used: Win2000, Windows XP, MYSQL

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  SMEC

  Oct 2014 - Mar 2018

  Network Engineer

  - Install and configure 15 VoIP systems in 3 major telecommunication company in Korea - Interwork between several VoIP Gateway and MGC or Call manager using VoIP Protocol - Implement VLAN, STP and Port Channel on CISCO 2960, 3750 Switches in VoIP Systems- Configure network systems based on routing protocol OSPF, EIGRP, BGP through the GNS3 - Complete three tests with Small-Cell equipment manufacturers in Taiwan- Install and configure the LTE system and Access Point in LTE environment - Troubleshoot various network issues that are affected in the VoIP Systems - Monitor VoIP system remotely and Cisco switch through the Network Management System- Installing, configuring and patching about network devices on Wi-Fi networks. - Regularly install software packages on network systems to make it run more efficiently and avoid future problems- Main tools used: Linux /Red-Hat, MySQL, SSH, Wireshark Show less

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  ARO Inc.

  Apr 2019 - Jun 2022

  Network Administrator

  - Configure and Install Cisco 3560 Switches, Extreme Networks 8000 Series in PCI Environment- Develop and Maintain documentation of procedures , Create network implementation - Install and Configure Firewall (Pfsense / ASA 5505) in PCI Environment- Active Directory, GPO, DNS Configuration and Implement PowerShell Scripting - Monitor and Troubleshoot Network infrastructure and VoIP Service through Zabbix monitoring tool- Configure and analyze network systems based on routing protocol OSPF, EIGRP, BGP - Regularly test and install issued patches on network systems & servers to remove security vulnerability- Develop and implement Python scripts about Network Automation - Respond to internal users requests via helpdesk tickets - Main tools used: Windows Servers, Python, Linux Bash Script, WireShark Show less

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  Long View Systems

  Nov 2022 - now

  System Consultant

  - Firewalls, IPS/IDS, Palo Alto- TCP/IP, IPSEC Site to Site VPN, GRE, DMVPN, Client VPN, NAT, VRF technologies- Data Center technologies such as VPC, VDC, FcoE, FC, virtual switching- Cisco IOS and NXOS- F5 Configuration - Layer 2 Technologies such as switching, VLAN, spanning tree- Layer 3 Routing protocols: MPLS, BGP, EIGRP, OSPF- Software-defined Networking (SDN)- Wireless design and configuration- Network monitoring solutions