Sergej Klein

Freelancer in e-procurement

Core competences

E-procurement Projects with passion for details. Consultant for procurement systems and procurement processes since 2008. As a freelancer since 2010.

My project experiance has started as Software Developer and support, Technical Consultant and now as Project Lead or Product Owner:
3+ S/4 HANA projects with SAP Fiori
16+ e-procurement projects
10+ Rollout projects
10+ System updates or bigger change requests
Other roles: ITIL Change Manager, Contract Manager, Project Purchaser und Trainer

Project references on demand.

Agile Certified Practitioner(PMI-ACP) certified.

My hobbys:

10 years Freelancer since:

International projects

I love to work in an international environment. Here is the list of countries I´ve collected so far.

My languages:


My tools and hardware

  • IKEA BEKANT high-adjustable desk with MARKUS chair
  • Lenovo ThinkPad X1 Carbon Gen 8 - i7
  • Monitor von Dell S2419HM 24 Zoll (RedDot Design Award)
  • USB-C Docking station: Dell 452-BCCW
  • Apple Magic Keyboard, Microsoft IntelliMouse
  • Telefonkonferenzen mit Jabra Speak 710
  • Notes with OneNote
  • iPhone XII Mini
  • Travel bag: Victorinox Lexicon Hardside Global Carry-On
  • Laptop bag: Mobicase
Projektarbeit e-procurement-System SAP Business 2009

Digital Native, early adopter, fast thinker

eBay 2002. Twitter 2009.

Airbnb superhost. IoT enthusiast.

Carsharing User. Train driverr.

Posteo, Bluestacks,

Local shopper. Plastic avoider.


My certificates

  • 2023 ivalua Certification - L1 Foundational

  • 2021 PMI-ACP

  • 2020 Certified SAFe 5 Practitioner

  • 2019 Professional SCRUM Product Owner I

  • 2016 WDAR00 Ariba Overview and Implementation Guidelines

  • 2015 SAPSRM Overview of SAP SRM applications

  • 2010 ITIL V3 Foundation

  • Requisitioning S/4 HANA with WPS4

    Business Consultant for Procure to Pay Requisitioning stream. Covering all special processes within chosen WPS4 requisitioning toolbox and building lean follow-up processes with SAP Central Procurement Hub, Lean Services, external service entry and Avvaneo

    WPS4 Berater

    Global Solution Architect S/4 HANA Procurement

    Global SAP S/4 HANA Implementation and consolidation of local SAP systems in Workstream Procure to Pay as IT-Architect. Design and harmonisiation of procurement process according to SAP standard, as well as introducing Fiori Apps and SAP Ariba Modules where useful.

    Product Owner Projekt 2018

    SAP Ariba Berater für Strategic Sourcing und Change Management

    Change Management for entire Ariba Suite Implemention project: SLP, eSourcing, Contract Management, Guided Buying and Commerce Automation

    SAP Ariba Berater

    Product Owner S/4 HANA Procurement for Requisitioning and external service entry.

    Product Owner for the SAP S/4 HANA workstream Procurement with team and process responsibility for purchase requisitions based on SAP Fiori, complex services via MM-SRV and external service entry through 3rd party tool prego servicecat

    Product Owner Projekt 2018

    Procurement process consulting and purchasing

    Purchaser for an insurance Start-Up: Concept and implementation of agile procurement processes for a new Start-Up company in a digital environment. Operative procurement, withing commodities: external service provider, software and SaaS, Sourcing, Invoicing and Contract Management.

    Einkaufsprozess-Beratung und Projekteinkauf 2017

    ITIL Change Management for a fashion retailer

    Responsible for the operative processing and compliance of change mnagement process instructions. Authorizing and coordination of global change requests End-to-End. Project Manager in area of Windows Update, Monitoring upgrade for over 10.000 Client Systems

    ITIL Change Management Projekt 2016

    2015 and earlier

    E-Procurement solution expert of former WALLMEDIEN AG, now WPS Management / Wescale: E-Procurement and E-Invoicing Projects Procure-to-Pay at blue chip companies with different complexity, interfaces, doctypes. Additionally interfaces to SAP PM, PS as well as stock reservation and stock filling processes

    e-procurement Projekt 2015