Jin-Ho Yun - Server Migration Consultant with 25 Years

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Frankfurt am Main, Germany

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Experience

Feb 2024 - Dec 2024

11 months

Server Migration Consultant

Unknown Client

Linux server migrations: Planning and implementation of the migration with SLES Linux Deployment of VMs in VMware 8.0
Guiding colleagues in configuring Linux VMs in vSphere Auto Deploy
Application operations: Ensuring the smooth operation of applications on the migrated servers
Operations manuals: Revising existing operations manuals, adding to them and creating new ones when required
Reviewing service offerings: Adjusting and optimizing the service offering of external service providers
Logistics SW, RedHat Linux, Ansible, Confluence / Jira

Jan 2024 - Present

2 years 10 months

Bad Homburg, Germany

IT Consultant

HQ-Capital

Quandt Holding, financial investor since the mid-1980s, support of financial software
Support for the branches in New York, Bad-Homburg, Dubai, Singapore, etc.
Server and network monitoring using Open-Systems and Meraki Dashboard
Teams Voice telephony consolidation meetings regarding optimization for the holding company and its subsidiaries
Active-Directory administration
VMWare ESXI administration
Dell ESX Storage v3020 monitoring and administration
MS Server 2012 + 2019 administration, creating GPO‘s
Operations manuals: Revising existing operations manuals, adding to them and creating new ones when required
Monitoring with PRTG
Meraki-Cloud platform, Open-Systems network & security management, AD / Active-Directory, MS Server 2012 + 2019, Dell ESX Storage systems, PRTG

Oct 2022 - Dec 2023

1 year 3 months

Monitoring Engineer & Technical Contact for bahn.de

Deutsche Bahn

Member of the expert team, project „Vendo/Movas“
Technical responsibility for monitoring the train ticketing system on bahn.de, especially WEB
System runs in Amazon AWS, as containers / Pods
System monitoring and documentation: Continuous monitoring, analysis and documentation of the system to ensure optimal performance & availability
Incident management, process adjustment of work packages for 1st Level / 2nd Level & Support
Optimization of end-customer communication in the event of problems
Change management meetings, risk assessment and approval of operational changes
Checking deployment results in Gitlab, Assisify & Teams
Ticket management: Following up on and communicating tickets to Product Owners, stakeholders and development teams
Application management: Partial responsibility for the WEB presence and ticketing systems, including web interfaces
APIs and microservices: Troubleshooting + dependency analysis of other domains
Test management and troubleshooting: Monitoring during A/B,-Pre-Live,- tests & the commissioning of the new bahn.de website
Identification and reporting of critical issues / bottlenecks to stakeholders
Risk assessment and quality control: Discussion & evaluation of feature requests and change approvals
Meeting moderation and stakeholder management: Leading daily bug meetings & regular team meetings on automated tests in the stages (test/int, abn, load, pres, pre-prod, prod)
Technical support during annual emergency tests
Collaboration with DB-Systel & communication with stakeholders
Jira, Confluence, Instana (IBM), Graylog, Grafana, Splunk-enterprise, DB-Internal Tools, Assisify, Gitlab, Microservices, Docker, Confluence, Jira

May 2021 - Sep 2022

1 year 5 months

Senior Security Network Engineer

FI-TS (Finanz Informatik Technology Service)

Recertification & testing of firewall rules according to ECB guidelines following an audit for dwpbank through FI-TS
General connection analysis of software packages & associated firewall rules
Spot analysis of server vulnerabilities using Jenkins: network configuration, port scans, weak passwords, inadequate protection of folders and files
Analysis and active participation: Recertification of firewall rules
IT security consulting & optimization: Consulting and implementation of security rules from CyberArk to improve the IT security level
Stakeholder management, ensuring communication and cooperation internally as well as with the customer
Nmap, NetScan, Wireshark, Service Now (SNOW), Checkpoint and Cisco Firewalls, FNT-Command, MS-Access, MS-SQL, Excel, Change, Bambi, ARS, CATS, Jenkins, Splunk, CyberArk, IP address concepts, Skype, ITIL, Skybox

Mar 2021 - May 2021

3 months

Product Owner & SRE Site Reliable Engineer

Commerzbank AG

Agile project management for the development of an MVP
Development of a financial transaction test robot with Dynatrace-Synthetics
Product Owner: Managing software development with Confluence & Jira; creating User Stories
Collaboration with Dynatrace developers and providing instructions for programming tasks
Communication and reporting: Regular meetings on project progress and preparing PPP presentations for management
Server control: Access control to the jump servers using CyberArk
Problem management: Planning developer meetings on solution approaches, compliance & regulatory topics
Support and monitoring: Supporting the online banking platform DHB/CCS Meniga in the OnPrem Cloud
Teamwork in an international team with responsibilities divided between operations & monitoring
Agile Project Management, ITIL, User Stories, Epics, Jira, Confluence, IIS, Meniga, CyberArk, Windows 2012, MS-Teams, PSD2, SCA, 2FA, PowerPoint

May 2020 - Mar 2021

11 months

Support Engineer / Application Support Software Engineer

Synamedia / Vodafone GigaTV

Supporting the solution provider in operating & monitoring IPTV and legacy TV services on the Vodafone / Kabel Deutschland platform
3rd-level support: Troubleshooting backend infrastructure in both AWS and on-premise environments
Infrastructure monitoring: Monitoring the Kubernetes infrastructure using Grafana, Kibana, Prometheus, Uchiwa and Pagerduty
Ticket management and middleware patching using SNOW & Jira; patching the middleware; following up and tracking ticket handovers
Legacy system support, working at the console, reading Linux server logs, configuration checks and adjustments
Deployment and troubleshooting in the test environment as well as initial analysis to qualify errors on Kubernetes nodes (Linux)
Supporting continuous improvement processes in software development with Gitlab
Self-organization in a team of 3 support engineers
AWS S3, Docker, Kubernetes, Grafana, Kibana, Prometheus, Uchiwa, Linux, Centos, Pagerduty, Teams, Slack, Gitlab, Service Now, Jira, ITIL

May 2019 - May 2020

1 year 1 month

Test Manager & Testing of a Private Cloud Solution

FI-TS (Finanz Informatik Technology Service)

Testing an on-premise cloud solution on Hyper-V & MS-Orchestrator for Landesbanken: HELBA, NordLB, BayernLB, LBBW, DEKA
Test execution and documentation: ongoing testing of the cloud solution across various stages, including documentation of results
Communication with the internal cloud development team & project managers regarding bugs
Reviewing and adjusting operating concepts
PAM access concepts: Managing and planning automated service & admin accounts for secure access to the private cloud
Active participation in meetings to prepare application pilots for financial institutions
System analysis using Splunk & communicating the results to customers & involved teams
Reviewing and validating technical documents; creating technical one-pagers for each institution
Supporting pre-tests for pilot applications & actively developing test automations further
Documenting Infrastructure as Code errors & coordinating with developers
Hyper-V, MS-Orchestrator, MS-SCOM, MS-VMM, MS-SCCOM, MS-Server 2012 & 2016, Red Hat 7, Docker, MS-SQL, CyberArk, Splunk, Github, network, Squid-Proxy, VLAN, VM, Azure-Connector, NetApp, SAP-CAT’s, MS-Visio, ITIL

Mar 2019 - May 2019

3 months

IT Consultant Windows and VMWare

Enexion GmbH

IT consultant for the on-premise IT environment + VMWare
Creating IT documentation of the current configuration and coordinating solution approaches
General server administration
MS Active Directory, MS-Server 2008 - 2016, ITIL, VMWare ESXI, Hyper-V, Watchguard Firewall, Veeam

Feb 2017 - Mar 2019

2 years 2 months

Data Center Engineer, Linux & Windows

Dimension Data – VW-MAN MTB & MDT

Administration of 1400 Linux and Windows servers in the Dimension Data private cloud solution on VMWare ESXI / Oracle OVM
Supporting the transition team in migrating Linux/Windows servers to the private cloud
Stakeholder management in the Partner Operating Center (POC) for customers & partners (SAP, web developers, network, security, storage)
Administration of VM and on-premise servers including SLES Suse Linux, OVM, Oracle Linux, Cisco UCS, Windows servers, Ansible & Jenkins
Jump server access managed using the PAM solution CyberArk; configuration of session management, multi-factor authentication & auditing
System maintenance and monitoring of server health parameters
Backup and recovery for database and application servers using Commvault Simpana
Storage management: NetApp Metrocluster, scaling LUNs & volumes
Active Directory: Administration of the production environment and maintenance of CMDB databases
Network and security: Firewall management, creating rule requests and supporting network troubleshooting
Monitoring using Dimension Data’s own solutions
Service provider coordination: eShelter DataCenter Cisco & NetApp
Creating & revising IT processes; maintaining wikis on Confluence and SharePoint
Incident management & major incidents according to ITIL
SLES-SUSE Linux Enterprise Server 11 & 12, Red Hat, MS Active Directory, Microsoft-Server 2008 - 2016, CyberArk, Ansible, Jenkins, ITIL, VMWare ESXI, Hyper-V, SAP, Simpana, CommVault Backup, SC2 (VW-Service Center 2), Cisco UCS, eShelter

Feb 2016 - Jan 2017

1 year

Frankfurt, Germany

IT Service Engineer

Systrade GmbH

Supporting IT applications for medium-sized companies in the greater Frankfurt am Main area
IT project management and infrastructure management: approx. 8 ESXI servers with 30 VM Windows/Linux servers as well as physical servers and racks
Network architecture: Project planning, Cisco core switch upgrades
Team management and training: Managing employees in setting up & rolling out customer notebooks and replacing network hardware
Hands-on work with Windows and Linux servers regarding installation, maintenance and operation
Incident management and change approval; processing problem, service & change tickets
Revising and creating operating concepts and manuals
MS Active Directory, Exchange-Server 2010 & Office 365, MS-Server 2008 & 2012, VMWare ESXI, Hyper-V, Linux, Windows Server 2012 + 2016, Watchguard Firewall, Backup-Exec 2012 & 2015, Veeam, Cisco Catalyst 3850

Jun 2015 - Jan 2016

8 months

Partial Project Lead in Network Architecture

Arvato Systems

Network planning & design for existing & new customers (end customer: Hettich), virtualized with Juniper SRX
Implementation of load balancers, proxies, SAP routers, TMG servers, web dispatchers, DNS, NTP, DHCP and Streamworks
Creating and managing project plans (MS Project, eWorks)
Leading stakeholder meetings and migrating machine networks with the network/security team
Implementing customer requirements on Layers 2 & 3, including VLAN and IP network planning
Collaboration with Service Delivery, Service Management, Datacenter Run and Build teams
VPN planning: configuration of site-to-site and dial-in VPNs (IPSec)
Project effort estimation & escalation in case of bottlenecks
Troubleshooting using Graylog and requesting firewall rules
Script customization in Jenkins and change management in eWorks
MS-Project, MS-Visio, Graylog, Vlans, MPLS, VRF, FNT-Command

Oct 2014 - Dec 2015

1 year 3 months

Frankfurt, Germany

Project Manager + IT Administrator + Technical Purchasing

Wettmeister Service GmbH

Management of approx. 20 on-premises and VM Windows 2008/2012 + Linux servers
Backup checks, user & permission management
Ticket processing (incidents) according to ITIL: creating, analyzing, tracking and resolving
Network administration of Cisco switches & firewalls
Network migration from ADSL to VDSL at 30 locations
Deputy team lead during an IT rollout at 30 locations
2nd & 3rd level support for network and server issues
Planning and implementation of VMware ESXI + SQL 2012
Administration of the VOD “JustAddPower” video wall solution with Cisco switches
Technical purchasing for hardware, software, network & video wall solutions
Management of an IT budget of approx. 300.000 €
Documentation of operating manuals and wikis
MS Server 2008 & 2012, MS-SQL 2012, WIN 7, VMWare ESXI, MS Active Directory, Cisco ASA 55xx, C2960 series, JustAddPower, ArcServe r15, Veeam, VOD

Nov 2013 - Oct 2014

1 year

Berlin, Germany

Migration Specialist, Service Desk - Support

Vattenfall

Migration from Windows XP & Office 2003 to Windows 7 & Office 2010 for approx. 18.000 clients
Incident handling and administration of MS Server 2003/2008, Exchange Server and RAS
Win XP & 7, MS Office, MS Server, MS AD, Remedy, Dameware, RCMD, SD-Toolbox, Symantec-Drive Encryp, Safenet Cryptocard

Aug 2013 - Nov 2013

4 months

Kassel, Germany

1st & 2nd Level Support

Landeswohlfahrtsverband

Rollout migration support and incident management for 1.200 clients
Migration from Windows XP & Office 2003 to Windows 7 & Office 2010
Administration of MS Server 2003/2008, Exchange 2003/2007, Linux, Citrix Presenter & TS clients Igel HW
Win XP, Win 7, MS Office, MS Server, ACMP, ticket systems, Echolon, Citrix Presenter, Terminal Server

Aug 2006 - Mar 2011

4 years 8 months

IT, Server and Network Administration

Hyundai-Kia Machine Tools Europe GmbH

Administration of MS server services: Datev, SAP and MS TS Server 2003
Support of Windows XP clients
Management of the WAN connection with Cisco firewall & routers on Dell servers
MS Server 2003, MS Active Directory, SAP server, Cisco Pix 501, VPN, WAN, Dell PowerEdge 840

Jan 2006 - Dec 2008

3 years

Eschborn, Germany

External IT Consultant

Pantech & Curitel

Complete IT management and setup of the European headquarters in Eschborn
Administration of Windows servers, Internet + WAN connection, and telephone system

Sep 2005 - Jul 2011

5 years 11 months

IT Consultant

Pantos Logistics

Server management of server services including Exchange, TS, and application servers
Operation of the WAN SDSL network
MS Server 2003, Active Directory, Bintec Firewall, IPSEC-VPN, WAN, SDSL, DHCP, DNS, ML Proliant and Dell servers

Apr 2003 - Dec 2015

12 years 9 months

Germany

Managing Director / IT Service Provider for SMBs

HAYU ITC GmbH & Co KG

Support for approx. 40 SMB companies in the mid-sized business sector (Hesse), such as Hyundai Mobis, Nexen Tire, etc.
Planning, implementation, and administration of Active Directory and user support
Setup of leased lines, network cabling, VPN, and firewalls
Server management: file, backup, email, and MS SBS servers
Support and setup of ISDN telephone systems
Administration of Windows Server 2000-2012, Exchange Server 2007, Blackberry, and NAS systems
Troubleshooting and repair of IT systems

Mar 2003 - Dec 2021

18 years 10 months

Frankfurt, Germany

IT Administrator & IT Manager

Atlantic Integrated Freight (A.I.F)

Administration, planning, and maintenance of IT and telecommunications systems for logistics locations
SBS 2008 server with Active Directory; support for 30 PCs at 2 locations
Administration and configuration of the Agfeo IT 200 telephone system and Bintec firewall
Win XP, Win 7, MS SBS 2000 - 2012 Server, MS-Active Directory, Terminal Server, Agfeo IT 200, Bintec-Funkwerk VPN Router, HP Proliant

Mar 2003 - Dec 2013

10 years 10 months

Frankfurt, Germany

IT Consultant

Bank of Korea

Consulting and support for IT PCs and networks
Administration of the Siemens telephone system and Cisco Switch 2960
Cisco Switch 2960, firewalls, XP, Siemens telecommunications

Mar 2003 - Dec 2013

10 years 10 months

Lecturer / Training

ML Consulting für Deutsche Bundeswehr

Teaching client-server administration nationwide
Network basics, TCP/IP, client-server, Active Directory

Jan 2003 - Dec 2013

11 years

IT Project Manager / Administrator

Eukor Car Carrier Inc.

IT relocation management: coordination of external service providers, construction supervision, SDSL provider
Dismantling and setup of servers, databases, and network components in server racks
Administration of MS file, Exchange, and Blackberry servers and VPN users
Migration from MS-AD 2003 to 2008
Consulting and setup of the Juniper SA 2500 VPN solution
Cisco Catalyst 2950, Networkbox, MS-AD

Aug 2000 - Apr 2003

2 years 9 months

Frankfurt, Germany

2nd Level Support NT & AIX SRV

Dresdner Bank

2nd level support for more than 4,000 users
Notebook rollout and network support for more than 13,000 devices
Use of PC-Duo, Hyena, Perl, and RAS support

Aug 1999 - Jul 2000

1 year

Düsseldorf, Germany

Remote

Third Level Support NT Server & Terminal Server Setup

Henkel-Düsseldorf (bei Debis-Systemhaus)

3rd level administration & support for approx. 100 NT, Novell, backup, and antivirus servers
Domain consolidation and remote monitoring
Planning, setup & documentation of a training center with Terminal Server (Citrix Metaframe 1.8)
Environment: chemical industry and automotive (Mercedes-Benz steering systems)

Jan 1999 - Dec 1999

1 year

Owner / Founder

Yun IT Consulting

Founded a business for IT consulting and advisory services

Jan 1999 - Aug 1999

8 months

Hamburg, Germany

Trainer

LVA Rentenversicherung / Siemens-Essen

Conducted various training sessions on NT Server & Workstation, administration, and networking fundamentals
Training in the NT environment and networking

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Transportation, Banking and Finance, Aerospace and Defense, Manufacturing, and Telecommunication.

Information Technology

Transportation

Banking and Finance

Aerospace and Defense

Manufacturing

Telecommunication

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Project Management, Operations, Quality Assurance, Procurement, and Customer Service.

Information Technology

Project Management

Operations

Quality Assurance

Procurement

Customer Service

Skills

Several Years Of Experience As A Senior System Engineer In 2nd + 3rd Level Support
Application Support At Os Level
25 Years Of It Experience, Especially In Operations Across A Wide Range Of It Areas
Extensive Knowledge Of Various Monitoring Solutions
Experience With Private Cloud Solutions Based On Sccm Technology And Vmware.
Aws Cloud Computing + S3 Know-How + Github Devops Tools
Teamwork: Very Good.
Personally: Open And Honest.
Able To Learn: I Acquire New Technologies Through Self-Study As Well As Training.
Other: Quick Understanding Of My Own Limits And Use Of External Support
Independent: I Independently Look For Tasks And Develop Suitable Solutions For Them.

Languages

German

Native

English

Advanced

Korean

Advanced

Education

Oct 1993 - Jun 1998

Fachhochschule Düsseldorf

Electrical Engineering / Microelectronics · Düsseldorf, Germany

Aug 1990 - Jun 1993

Städt. Kolleg und Fachschule für Technik Duisburg Nord

State-certified Electrical Engineering Assistant, University of Applied Sciences entrance qualification · Duisburg, Germany

Certifications & licenses

Consultant For Electric Mobility And Alternative Drives

Dekra

CyberArk Trustee

CNA

Certifed Novell Administrator

Adobe Sales Professional

Statistics

Experience

Total positions 26

Experience in Information Technology 21 y

Avg length 3 y 9 m

Longest experience 18 y 9 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Server Migration Consultant, IT Consultant, Monitoring Engineer & Technical Contact for bahn.de

Main industries Information Technology, Transportation, Banking and Finance

Main business areas Information Technology, Project Management, Operations

Qualifications

Certifications earned 7

Profile

Member since

March 2025

Last update

October 2026

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Frequently asked questions

Have questions? Find more information here.

Jin-Ho is based in Frankfurt am Main, Germany.

Jin-Ho speaks the following languages: German (Native), English (Advanced), Korean (Advanced).

Jin-Ho has at least 28 years of experience. During this time, Jin-Ho has worked in at least 24 different roles and for 25 different companies. The average length of individual experience is 1 year and 1 month. Note that Jin-Ho may not have shared all experience and actually has more experience.

Based on recent experience, Jin-Ho would be well-suited for roles such as: Server Migration Consultant, IT Consultant, Monitoring Engineer & Technical Contact for bahn.de.

Jin-Ho's most recent position is Server Migration Consultant at Unknown Client.

In recent years, Jin-Ho has worked for Unknown Client, HQ-Capital, Deutsche Bahn, FI-TS (Finanz Informatik Technology Service), and Atlantic Integrated Freight (A.I.F).

Jin-Ho is most experienced in industries like Information Technology, Transportation, and Banking and Finance. Jin-Ho also has some experience in Aerospace and Defense, Manufacturing, and Telecommunication.

Jin-Ho is most experienced in business areas like Information Technology, Project Management, and Operations. Jin-Ho also has some experience in Quality Assurance, Procurement, and Customer Service.

Jin-Ho has recently worked in industries like Transportation, Banking and Finance, and Information Technology.

Jin-Ho has recently worked in business areas like Information Technology, Operations, and Quality Assurance.

Jin-Ho attended Fachhochschule Düsseldorf for Electrical Engineering / Microelectronics.

Jin-Ho has 7 certificates. Among them, these include: Consultant For Electric Mobility And Alternative Drives, CyberArk Trustee, and CNA.

Jin-Ho is immediately available full-time for suitable projects.

Daily rate distribution

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The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

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Daily rate avg. 899 €

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Median rate 924 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 16 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.