11/10/2026 updated

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Siebel Architect/Developer/Administrator

Thessaloniki, Greece
Worldwide
Dipl. Electr. Eng., MBA
Thessaloniki, Greece
Worldwide
Dipl. Electr. Eng., MBA

Profile attachments

___DE CV___No___Ioannis Xanthopoulos___.pdf
___EN CV___No___Ioannis Xanthopoulos___.pdf
___GR CV___No___Ioannis Xanthopoulos___.pdf

About me

I am a freelance contractor with 25 years hands on experience in Siebel projects. I completed numerous such projects in England, Netherlands, Switzerland, Germany, Ireland, Greece and the U.A.E.

Siebel CRM
I am a freelance contractor with 25 years hands on experience in Siebel projects. I completed numerous such projects in England, Netherlands, Switzerland, Germany, Ireland, Greece and the U.A.E.

Significant milestones in my career so far are:

(1) the upgrades I undertook for Vodafone from v8 to IP18.12 and for a major retail bank going from v8 to IP22.2.

(2) Further on, I decommissioned a bespoke java-based CRM system by single-handedly re-building it's functionality in Siebel. This milestone was especially significant given the political challenges posed by the legacy team, who perceived a risk of job-loss if their system was successfully decommissioned. Please note that the decommissioning was previously attempted by a major consulting firm and failed.

(3) I am currently the domain architect,for a telco,preparing an update from IP18.12 => IP24.12

(4) I hold a strong engineering background (10 semester) and completed an MBA in Finance on a scholarship awarded by the Cyprus Development Bank.
 

Experience

Professional experience10+ years
Freelancer since2003

Languages

GermanFluentEnglishFluentGreekNative speaker

Project history

Production support & troubleshooting / Siebel Upgrade / Administration / Delivery across environments

Vodafone

Telecommunications

>10.000 team member

Siebel Administrator (IP18.12)
Siebel Administration and Deployment of Releases across all Siebel Environments including production.
Troubleshooting Production issues.
Development of new functionality
Consultation regarding best technical approach.
Technical lead for the Siebel upgrade 8.0.0.8>17.0>18.6>18.8>18.11>18.12

Certificates

Oracle Siebel CRM Foundations Associate

Oracle

2025

Siebel 2000

Siebel Inc

2011

Siebel v8

Oracle

2011


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