Mar 2021 – Oct 2022 · 1 yr 7 mos

• Helping the customer to land at the Kafka world
• Giving the best/good practice

Aug 2020 – Mar 2021 · 7 mos

• Handling the Privcera's issues with Linux/AWS/Network skills.
• Improving the performance via the email/remote session

Jan 2019 – Apr 2020 · 1 yr 3 mos · Singapore

• After joining the good team, I try to solve the issues about the HDP product with Hadoop and Linux skills
• Customers: Samsung, BoA, Apple, MS, IBM, etc
• Usually, I focus on the Hive, Sqoop, and oozie issues
• During this time, I really enjoy working with our team.

May 2016 – Aug 2018 · 2 yrs 3 mos · South Korea

• - Handling the issues related with CDH ( Cloudera Distribution including Apache Hadoop )

Aug 2018 – Dec 2018 · 4 mos · Singapore

• - Handling the Hadoop issues that are related to HDP

May 2015 – May 2016 · 1 yr · Gangnam-gu, Seoul, Korea

• Handling the issue from the customer via Web, Phone
• 1) Customer : all Korean customers
• Korean : Samsung, SKInfosec, Shinhan Bank, NHLife, etc
• 2) Solving the problem and tuning the system using MapR Product
• Investigating about the performance, memory issue

Oct 2014 – Apr 2015 · 6 mos · Gangnam-gu, Seoul, Korea

• Handling the issue via web and phone remotely.

Oct 2013 – Sep 2014 · 11 mos · singapore and Korea

• Deployment of the product on the customer sites.
• 1) Customers : SKT, Globe, Orange
• Deploying the TCP optimization solution on these customers
• Using the tcpanlayzer and tcpdump, analysis the packet to achieve a good perforrmance
• Trial test on the customer sites
• 1)Customers : KT, LGU+
• Deploying the TCP optimization solution
• Running the test and capturing the network for analysis
• Handling the issue via web , phone and onsite.

Oct 2012 – Oct 2013 · 1 yr · seoul

• Handling the issue from the customer via Web, Phone
• 1) Customer : all Korean customers and Global Companies
• Korean : Samsung, SKT, LG, Hyundai, POSCO, KISTI, KT, KB Bank, KRX etc
• Global Companies : IBM, HP, Bank of American, NTT, etc
• 2) Solving the problem and tuning the system using RedHat’s production
• Investigating the kernel panic, memory issue
• Verifying the architecture of RedHat Enterprise Cluster/Virtualization.

Jun 2010 – Oct 2012 · 2 yrs 4 mos · Gwanak-gu, Seoul, Korea

• Making and managing new systems for Interpark and subsidiary companies
• 1) Making the infrastructure for Computer Graphic company(www.digitalidea.co.kr)
• Big Storage : using the Lustre, Nexenta and Arista(10G Switch)
• Tuning up the system : renderfarm, storage
• 2) Making the web service system(www.banni.kr)
• a low latency using minimize DB access : memcached, nosql
• 3) Making the blog (www.mixsh.com) : low cost system using the cluster files system
• 4) Making the e-shop using the KT cloud solution
• 5) Managing the Render Farm system and Data center
• Validation and application about the open-source and new technology
• 1) Hadoop, Memcached, Lustre, Glusterfs, MongoDB, FastTCP, Nexenta
• Tuning and solving the issue
• 1) Network performance : upgrading the driver and changing the configuration especially buffer,
• 2) Storage performance : changing the RAID configuration and upgrading to SSD.
• Managing the 20 peoples in Intperak + 3 subcompanies ( Best Buyer, Digital Idea, DigiArt)

Dec 2005 – Jun 2010 · 4 yrs 6 mos · Yongsan-gu, Seoul, Korea

• Building HPC Clusters
• 1) ADD X-Cluster, Universities clusters and LG-CNS supercomputer : using Linux, infiniband
• Introducing the Xsigo and SFS to Korea big company
• 1) the CISCO datacenter day to attend as a presenter
• 2) attend the KT POC about IO virtualization
• 3) Using the infiniband, Xsigo(I/O Virtualization), Virtualization, and Linux
• NEC VP7000 IPv6 certified by TTA
• 1)FreeBSD, Compiling the kernel, C program
• Making the CISCO WLAN auto-contain program
• 1)C programming, Wireless skill, SNMP
• Introducing new solution to Big 5 Company in Korea
• 1)Target : Samsung, LG, Hyundai, POSCO, KT
• 2)Solution : Desktop virtualization(Ringcube, Kidaro), x86 SMP machine(SacleMP), Video Server(Broadbus), 10G network switch ( Arista)

Feb 2002 – Nov 2005 · 3 yrs 9 mos · Korea

• Making Linux Cluster System.
• 1)KISTI, KAIST, POSDATA, KIST
• 2)Using the Linux, Myrinet, infiniband Network and NAS storage skills
• Manage the BMT Lab - with IBM, HP, and Intel.
• 1)Validation the solution on Linux
• S/W L4 system.
• Opensource programs
• Oracles
• solution about making the linux cluster : rocks, x-cat
• 2)Lecture about Suse Linux and Cluster
• using HPC skills
• Manage the 2 Linux Cluster systems
• 1)60 nodes : x86-based, Myrinet
• 2)40 nodes : Itanium2-based , Myrinet and Infiniband
• 3)using H/W, Linux,Network, and high speed interconnect(myrinet, infiniband) skill