Dennis Roßbach-Interim Senior Strategic Buyer
Check rate
Experience
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
Freelance Expert
European Defence Agency
- EDSTAR program
- Revision and optimization of NATO standards (procurement)
- Project- and hourly-based work
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
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
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
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
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
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
Interim Senior Strategic Buyer
Knauf Gips KG
- Procurement of software and licenses (SaaS, cloud)
- Tender management, contract negotiations, process optimization
- Spend analysis, forecasting, digitalization
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
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
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.)
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
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
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
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
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
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
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Professional Services, Education, Information Technology, Transportation, Aerospace and Defense, and Government and Administration.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Procurement, Information Technology, Strategy, Supply Chain Management, Marketing, and 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
Education
Grünes Auto Göttingen - Andreas Schmidt & Michael Patscheke GbR
Office Communication Clerk (IHK) · Office Communication Clerk · Göttingen, Germany
Wirtschaftsfachschule Göttingen
Göttingen, Germany
Gesamtschule Göttingen
Secondary School Diploma · Göttingen, Germany
Certifications & licenses
Office Communication Clerk (IHK)
IHK
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Dennis is based in Schifflange, Luxembourg and can operate in on-site, hybrid, and remote work models.
Dennis speaks the following languages: German (Native), English (Advanced), French (Elementary), Luxembourgish (Elementary).
Dennis has at least 16 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.
Based on recent experience, Dennis would be well-suited for roles such as: Interim Senior Strategic Buyer, Freelance Expert, Founder & Managing Director.
Dennis's most recent position is Interim Senior Strategic Buyer at Wintershall Dea International GmbH.
In recent years, Dennis has worked for Wintershall Dea International GmbH, European Defence Agency, Wintershall Dea GmbH, European Commission, and Supplier Sentinel Sàrl.
Dennis is most experienced in industries like Professional Services, Education, and Information Technology. Dennis also has some experience in Transportation, Aerospace and Defense, and Automotive.
Dennis is most experienced in business areas like Procurement, Information Technology, and Strategy. Dennis also has some experience in Supply Chain Management, Marketing, and Product Development.
Dennis has recently worked in industries like Education, Professional Services, and Information Technology.
Dennis has recently worked in business areas like Information Technology, Strategy, and Procurement.
Dennis holds a Doctorate in Office Communication Clerk from Grünes Auto Göttingen - Andreas Schmidt & Michael Patscheke GbR and a Bachelor from Wirtschaftsfachschule Göttingen.
Dennis has 1 certificate: Office Communication Clerk (IHK).
The availability of Dennis needs to be confirmed.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
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 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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