Jörn Greszki

Berufserfahrung von Jörn Greszki

• Bis heute 2 Jahre und 9 Monate, seit Okt. 2021

  Solution Designer

  CARIAD - a Volkswagen Group Company

• Bis heute 3 Jahre und 2 Monate, seit Mai 2021

  Procurement Support

  Deutsche Bahn

• Bis heute 3 Jahre und 7 Monate, seit Dez. 2020

  5G Design Specialist & Procurement Management

  HELIOS Park-Klinikum Leipzig

• Bis heute 4 Jahre und 6 Monate, seit 2020

  Owner

  INFRA-SOLUTIONS GmbH

• Bis heute 24 Jahre, seit Juli 2000

  Owner

  DRESCHER & DRESCHER GmbH

• 1 Jahr und 10 Monate, März 2019 - Dez. 2020

  Business Consultant

  Vodafone GmbH

  - process design - process support tool design - accounting support

• 1 Jahr und 4 Monate, Juni 2017 - Sep. 2018

  Project Manager / Business Process Consultant

  Tele Columbus AG

  - process developement - supporting financial accounting - project support for implementation projects - engineering support for material specification and selection - business modelling for FTTx rollout

• 2018 - 2018

  Business Consultant

  Fraport AG

  Consultancy for - technical tender strategy - technical criteria definition

• 1 Jahr und 1 Monat, Juli 2015 - Juli 2016

  Project Manager

  Telefónica Deutschland Gruppe

  Project Management for 3 implementation projects

• 6 Monate, Okt. 2014 - März 2015

  Senior Network Design Engineer

  Nokia Networks

  Core Network design in order to merge O2 and e-plus core networks - gap analysis betwwen 2 networks - design of transition phase network - design of target network

• 2 Jahre und 7 Monate, Jan. 2012 - Juli 2014

  OSS / Lawful Interception Consultant

  Hutchison 3 Austria GmbH

  Design and purchasing of a Lawful Interception Solution. Review and testing of OSS modules. Tasks in and around ZTE OSS and related functional blocks in the ZTE CN nodes.

• 1 Jahr und 8 Monate, Dez. 2009 - Juli 2011

  Core Network Consultant

  Hutchison 3 Austria GmbH

  Replacement of the NSN R4 CS&PS network elements by ZTE CS&PS Core elements. Review, testing and gap analysis of the OSS of ZTE.

• 3 Monate, Okt. 2009 - Dez. 2009

  Core Network Consultant / Billing Chain Consultant

  NSN - Nokia Solutions and Networks

  Analyzing and resolving problems within the charging and billing chain from CS CN element up to the billing engine.

• 1 Jahr und 4 Monate, Juli 2008 - Okt. 2009

  Core Network Engineer

  Alcatel-Lucent Schweiz AG

  Sunrise outsourced O&M department to Alcatel-Lucent, the tasks were almost the same as in Sunrise.

• 1 Jahr und 9 Monate, Nov. 2006 - Juli 2008

  Core Network Engineer

  Sunrise Communications AG

  Operation, Maintenance, Testing and Implementation tasks within the Sunrise CS&PS Core Network.

• 3 Monate, Aug. 2006 - Okt. 2006

  Security Analyst

  Telefónica Deutschland Gruppe

  Collection and analysis of O2 / Telefonica network security guidelines and demands. Gap analysis O2 demands versus security features and functionality of NSN core network products. Review and adapt the CN design as well as the product design to match O2 guidelines.

• 1 Jahr und 3 Monate, Mai 2005 - Juli 2006

  SMS platform design / Charging & Billing design

  Telefónica Deutschland Gruppe

  Review and implementation support for a signaling gateway / mediation device. - GAP analysis - technical consultancy - system / network design - charging/mediation/billing chain design

• 5 Monate, Okt. 2004 - Feb. 2005

  Network Monitoring Expert

  Vodafone GmbH

  Temporary setup and operation of a monitoring solution as part of a network optimization campain.

• 1 Jahr und 2 Monate, Nov. 2003 - Dez. 2004

  Network Monitoring Expert

  Orange Israel

  Implementation and operation of a network monitoring solution. Analysis, testing and support related to the entire landscape of Partners existing monitoring solutions.

• 4 Monate, Feb. 2003 - Mai 2003

  Management Consultant

  H3G Austria

  Review and fine tuning of processes introduced 1/2 year ago