Dennis Roßbach - Interim Senior Strategic Buyer

Q: Where is Dennis based?

Dennis is based in Schifflange, Luxembourg and can operate in on-site , hybrid , and remote work models.

Q: What languages does Dennis speak?

Dennis speaks the following languages: German (Native), English (Advanced), French (Elementary), Luxembourgish (Elementary) .

Q: How many years of experience does Dennis have?

Dennis has at least 15 years of experience. During this time, Dennis has worked in at least 8 different roles and for 18 different companies . The average length of individual experience is 1 year and 10 months . Note that Dennis may not have shared all experience and actually has more experience.

Q: What is Dennis's latest experience?

Dennis's most recent position is Interim Senior Strategic Buyer at Wintershall Dea International GmbH .

Q: What companies has Dennis worked for in recent years?

In recent years, Dennis has worked for Wintershall Dea International GmbH , European Defence Agency , Wintershall Dea GmbH , European Commission , and Supplier Sentinel Sàrl .

Q: Which industries is Dennis most experienced in?

Dennis is most experienced in industries like Professional Services , Education , and Information Technology (IT) . Dennis also has some experience in Automotive , Transportation and Logistics , and Retail .

Q: Which business areas is Dennis most experienced in?

Dennis is most experienced in business areas like Procurement and Purchasing , Information Technology (IT) , and Strategy and Planning . Dennis also has some experience in Supply Chain Management , Marketing , and Product Development .

Q: Which industries has Dennis worked in recently?

Dennis has recently worked in industries like Education , Professional Services , and Information Technology (IT) .

Q: Which business areas has Dennis worked in recently?

Dennis has recently worked in business areas like Information Technology (IT) , Strategy and Planning , and Procurement and Purchasing .

Recommended expert

Schifflange, Luxembourg

Experience

Jan 2025 - Jun 2025

6 months

Hamburg, Germany

Interim Senior Strategic Buyer

Wintershall Dea International GmbH

Integration and transformation after an acquisition (M&A)
Supplier management, contract negotiations, process support
Contract redesign and transfer

Dec 2024 - Present

1 year 3 months

Brussels, Belgium

Freelance Expert

European Defence Agency

EDSTAR program
Revision and optimization of NATO standards (procurement)
Project- and hourly-based work

Mar 2024 - Dec 2024

10 months

Kassel, Germany

Interim Senior Strategic Buyer

Wintershall Dea GmbH

Carve-out and transformation after the sale of the company (M&A)
Supplier management, contract negotiations, process support
Digital transformation: eProcurement

Aug 2023 - Present

2 years 7 months

Brussels, Belgium

Freelance Expert

European Commission

Technical due diligence of a blockchain and AI application
Evaluation of the SaaS solution in supply chain and procurement
Report creation
Project- and hourly-based work

Feb 2023 - Present

3 years 1 month

Luxembourg

Founder & Managing Director

Supplier Sentinel Sàrl

Technology development for purchasing and logistics
Development of a web app for supplier risk management
Digitization of procurement processes

Jan 2023 - Dec 2023

1 year

Kassel, Germany

Interim Senior Tactical Buyer

Wintershall Dea AG

Procurement of software and licenses as well as managed services
Supplier management, contract negotiations, process optimization
Spend analysis, forecasting, digitalization, tenders

Aug 2022 - Dec 2022

5 months

Hamburg, Germany

Interim Senior Strategic Buyer

NVL B.V. & Co. KG

Procurement of licenses (SaaS, cloud, on-premise) and managed services
Risk management, contract negotiations, process optimization
Spend analysis, forecasting, digitalization

Jan 2022 - Oct 2022

10 months

Landau, Germany

Interim Senior Strategic Buyer

Progroup AG

Procurement of hardware, software, and licenses (SaaS, cloud)
Tender management, contract negotiations, process optimization
Spend analysis, forecasting, digitalization, managed print services

Jul 2021 - Dec 2021

6 months

Kitzingen, Germany

Interim Senior Strategic Buyer

Knauf Gips KG

Procurement of software and licenses (SaaS, cloud)
Tender management, contract negotiations, process optimization
Spend analysis, forecasting, digitalization

Aug 2019 - Jun 2020

11 months

Luxembourg

Interim Senior Strategic Buyer

DuPont De Nemours SARL

Procurement of production materials, indirect and direct
'Extended workbench' controls, rework, finishing
Contract drafting including negotiations and purchasing-side optimizations

May 2019 - Present

6 years 10 months

Luxembourg

Founder & Managing Director

SYBX Group Sàrl

Strategy, interim management, digitalization, consulting
Trainer in fire protection between July 2020 and June 2021, e.g. for the DEKRA Academy

Jun 2018 - Apr 2019

11 months

Frankfurt, Germany

Senior Operational Buyer

BNP Paribas S.A.

Procurement of professional services, IT hardware and software
Business continuity management and contract management including digitalization
Forecasting and analyses, tenders and negotiations
Implementation of new processes and tools (e-invoicing, etc.)

Jan 2016 - Dec 2018

3 years

Steinbach, Germany

Founder & Managing Director

Shiny Box GmbH

Car care products online shop
Part-time from January 2016 to May 2017 and from June 2018 to December 2018
Marketing, sales, product management, procurement of raw materials

Dec 2015 - May 2017

1 year 6 months

Oberursel, Germany

Buyer

Rolls-Royce Deutschland Ltd & Co KG

International procurement of engine components and raw materials
Supplier management, inventory planning
Reporting, creating forecasts, database creation
Cost analyses and cost reduction measures
Contract negotiations, process optimization, contract management

Aug 2015 - Nov 2015

4 months

Friedrichsdorf, Germany

Buyer

peiker acustic GmbH & Co. KG

International procurement of mechanical components and raw materials
Supplier management, warehouse planning, 'extended workbench'
Monitoring delivery dates, reporting, creating forecasts

Jan 2015 - Jul 2015

7 months

Steinbach, Germany

Buyer

KRONE GmbH

Procurement of services, temporary work, office supplies, packaging materials, IT, clothing, mobile communications
Supplier management, inventory planning
Fleet management: planning, contract management, procurement, monitoring, fuel card administration, lease processing, vehicle graphics
Implementation of a company car driver policy and a fleet management system
Optimization of the internal ordering process

Oct 2012 - Dec 2014

2 years 3 months

Kronberg, Germany

Junior Buyer

Accenture Services GmbH

Analysis, evaluation and optimization of the purchasing department
International supplier management
Implementation and monitoring of compliance
Support for the introduction and improvement of the inventory management system
Contract management and tenders
Procurement of services, IT and business supplies

Feb 2011 - Oct 2012

1 year 9 months

Göttingen, Germany

Procurement Clerk

Deutsches Primatenzentrum Göttingen GmbH

Procurement of lab materials, work and protective clothing, animal feed and office supplies under VOB and VOL
Monitoring delivery dates and evaluating offers
Inventory management and planning

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Professional Services (9 years), Education (7 years), Information Technology (3.5 years), Transportation (3 years), Automotive (3 years), and Retail (3 years).

Professional Services

Education

Information Technology

Transportation

Automotive

Retail

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Procurement (13.5 years), Information Technology (7 years), Strategy (7 years), Supply Chain Management (6.5 years), Marketing (3 years), and Product Development (3 years).

Procurement

Information Technology

Strategy

Supply Chain Management

Marketing

Product Development

Skills

Microsoft 365 + Azure
Hal2 (Software Of Deutsche Bahn Ag)
Wice Crm
Mach-web
Microsoft Dynamics
Sap (Mm, Srm, Ariba, S4/hana)
Coupa
Website Creation And Maintenance Via Wordpress
Paypal
Stripe
Klarna
Xrechnung
Artificial Intelligence
Blockchain
Machine Learning
Robotic Process Automation
Canva
Chatgpt
Tome
Ecovadis

Languages

German

Native

English

Advanced

French

Elementary

Luxembourgish

Elementary

Education

Oct 2008 - Jun 2010

Grünes Auto Göttingen - Andreas Schmidt & Michael Patscheke GbR

Office Communication Clerk (IHK) · Office Communication Clerk · Göttingen, Germany

Oct 2006 - Jun 2007

Wirtschaftsfachschule Göttingen

Göttingen, Germany

Oct 2000 - Jun 2006

Gesamtschule Göttingen

Secondary School Diploma · Göttingen, Germany

Certifications & licenses

Office Communication Clerk (IHK)

IHK

Profile

Created

July 2025

Last Update

September 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Dennis based?

Dennis is based in Schifflange, Luxembourg and can operate in on-site, hybrid, and remote work models.

What languages does Dennis speak?

Dennis speaks the following languages: German (Native), English (Advanced), French (Elementary), Luxembourgish (Elementary).

How many years of experience does Dennis have?

Dennis has at least 15 years of experience. During this time, Dennis has worked in at least 8 different roles and for 18 different companies. The average length of individual experience is 1 year and 10 months. Note that Dennis may not have shared all experience and actually has more experience.

What roles would Dennis be best suited for?

Based on recent experience, Dennis would be well-suited for roles such as: Interim Senior Strategic Buyer, Freelance Expert, Founder & Managing Director.

What is Dennis's latest experience?

Dennis's most recent position is Interim Senior Strategic Buyer at Wintershall Dea International GmbH.

What companies has Dennis worked for in recent years?

In recent years, Dennis has worked for Wintershall Dea International GmbH, European Defence Agency, Wintershall Dea GmbH, European Commission, and Supplier Sentinel Sàrl.

Which industries is Dennis most experienced in?

Dennis is most experienced in industries like Professional Services, Education, and Information Technology (IT). Dennis also has some experience in Automotive, Transportation and Logistics, and Retail.

Which business areas is Dennis most experienced in?

Dennis is most experienced in business areas like Procurement and Purchasing, Information Technology (IT), and Strategy and Planning. Dennis also has some experience in Supply Chain Management, Marketing, and Product Development.

Which industries has Dennis worked in recently?

Dennis has recently worked in industries like Education, Professional Services, and Information Technology (IT).

Which business areas has Dennis worked in recently?

Dennis has recently worked in business areas like Information Technology (IT), Strategy and Planning, and Procurement and Purchasing.

What is Dennis's education?

Dennis holds a Doctorate in Office Communication Clerk from Grünes Auto Göttingen - Andreas Schmidt & Michael Patscheke GbR and a Bachelor from Wirtschaftsfachschule Göttingen.

Does Dennis have any certificates?

Dennis has 1 certificate: Office Communication Clerk (IHK).

What is the availability of Dennis?

Dennis is immediately available full-time for suitable projects.

What is the rate of Dennis?

Dennis's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.