Last updated: February 27, 2026
Version: 2.1
for consulting services provided by
Dipl.-Ing. Quirin Hummel
(hereinafter referred to as "Contractor" or "Consultant")
for the websites:
(1) Scope of Application
These General Terms and Conditions (GTC) apply to all consulting services, services, and deliveries provided by the Contractor to businesses (Section 14 of the German Civil Code - BGB), legal entities under public law, and special funds under public law (hereinafter referred to as "Client" or "Customer").
(2) Exclusive Application
These GTC apply exclusively. Conflicting or deviating terms and conditions of the Client shall not be recognized unless the Contractor has expressly agreed to their validity in writing.
(3) Amendments
Amendments and supplements to these GTC must be made in writing. This also applies to the amendment of this written form clause.
(1) Type of Services
The Contractor provides individual consulting services in the following areas:
(2) Individual Consulting
These are expressly individual consulting services without a standardized course character. They are NOT distance learning courses or classes within the meaning of the German Distance Learning Protection Act (FernUSG).
(3) Service Description
The specific scope of services results from the respective order confirmation, the consulting contract, or the service description. Verbal collateral agreements require written confirmation.
(1) Offer and Acceptance
Offers made by the Contractor are subject to change and non-binding. A contract is only concluded upon written order confirmation by the Contractor or upon commencement of the provision of services.
(2) Changes to the Scope of Services
Changes or extensions to the agreed scope of services require a written agreement. Additional services will be charged on a time and material basis.
(1) Pricing
Unless otherwise agreed, the prices valid at the time of the order confirmation shall apply. All prices are exclusive of statutory value-added tax (VAT).
(2) Remuneration
Remuneration is generally based on the actual time spent at the agreed hourly rates. In the case of flat-rate remuneration, this is agreed upon separately.
(3) Travel Expenses and Out-of-Pocket Expenses
Travel expenses, out-of-pocket expenses, and other disbursements will be charged additionally based on actual costs incurred, unless otherwise agreed.
(4) Invoicing and Payment
(5) E-Invoicing
In accordance with the requirements of Section 14 of the German Value Added Tax Act (UStG), the Contractor is obliged to issue e-invoices from January 1, 2027. At the Client's request, invoicing can already be carried out in e-invoice format (ZUGFeRD or XRechnung). The Client is obliged to be able to receive and process e-invoices.
(6) Set-off and Retention
The Client may only set off claims or assert rights of retention with undisputed or legally established claims.
(1) Place of Performance
The place of performance is the Contractor's registered office, unless otherwise agreed.
(2) Dates and Deadlines
Dates and deadlines are only binding if they have been expressly agreed upon as binding in writing. Delivery and performance periods shall be extended appropriately in the event of force majeure, labor disputes, official measures, and other unforeseeable events.
(3) Digital Provision of Services
Online consultations take place by arrangement via digital tools such as Microsoft Teams and Zoom. The Contractor is responsible for data processing in connection with the execution of the meetings. If meetings are to be recorded, this will only be done with prior express consent.
(1) Information Obligations
The Client is obliged to provide all information required for the consulting completely and truthfully, to communicate changes immediately, and to designate contact persons.
(2) Consequences of Failure to Cooperate
In the event of failure or insufficient cooperation by the Client, deadlines shall be extended accordingly, the Contractor may be released from the obligation to perform, and additional costs may be charged to the Client. The claim to remuneration remains unaffected.
(1) Copyright
All concepts, analyses, strategies, documentation, and other work results created by the Contractor are subject to the Contractor's copyright.
(2) Rights of Use
Upon full payment of the remuneration, the Client receives a simple, non-transferable right to use the work results for the agreed purposes.
(3) Use of AI Tools
The Contractor may use AI tools to optimize its services. The final responsibility for all results lies with the Contractor. Confidential information of the Client will not be used for AI training unless expressly agreed otherwise.
(1) Confidentiality
Both parties undertake to treat all confidential information disclosed within the scope of the business relationship strictly confidentially. This obligation shall continue to exist even after the termination of the contractual relationship.
(2) Data Protection
The processing of personal data is carried out in accordance with the applicable data protection regulations (GDPR, BDSG). Details are regulated by the Privacy Policy at https://qubeec.com/datenschutzerklaerung/
(1) Warranty
The Contractor warrants the provision of consulting services in accordance with the state of the art and the recognized rules of consulting practice. In the event of defects, the Contractor is entitled to supplementary performance.
(2) Liability
The Contractor is liable without limitation for intent, gross negligence, and for damages resulting from injury to life, body, or health.
In the event of a slightly negligent breach of essential contractual obligations (cardinal obligations), liability is limited to the foreseeable damage typical for the contract.
Otherwise, liability for slight negligence is limited to 100% of the net order value, but to a maximum of 50,000 euros per claim.
(3) Statute of Limitations
Warranty and damage claims become time-barred 12 months after knowledge of the damage, but no later than 3 years after the conclusion of the contract.
(1) Ordinary Termination
Both parties may terminate the contractual relationship with a notice period of 4 weeks to the end of the month, unless otherwise agreed.
(2) Extraordinary Termination
The right to extraordinary termination for good cause remains unaffected.
(3) Consequences of Termination
Upon termination of the contract, services rendered up to that point must be remunerated, work results must be handed over, and confidential information must be returned or deleted.
In the event of force majeure, the performance obligations shall be suspended for the duration of the hindrance, and deadlines shall be extended accordingly. In the event of a longer duration (over 3 months), the contract may be terminated.
For contracts with Clients outside Germany, German law shall apply to the exclusion of the UN Convention on Contracts for the International Sale of Goods (CISG). The exclusive place of jurisdiction is Freiburg im Breisgau, Germany. The language of the contract is German.
(1) Engineering Consulting
Consulting is carried out according to the current state of the art. The Client is obliged to have calculations and concepts checked by its own specialists or external experts.
(2) AI Consulting
Consulting is carried out taking into account the EU AI Act to the best of our knowledge. The final responsibility for implementation and compliance lies with the Client.
(1) Written Form
Amendments and supplements to this contract must be made in writing. This also applies to the amendment of this written form clause.
(2) Severability Clause
Should individual provisions of these GTC be invalid, this shall not affect the validity of the remaining provisions.
(3) Applicable Law
German law applies exclusively, to the exclusion of the UN Convention on Contracts for the International Sale of Goods (CISG).
(4) Place of Jurisdiction
The exclusive place of jurisdiction for all disputes is Freiburg im Breisgau.
These GTC have been prepared with the utmost care. However, no guarantee can be given for the completeness, correctness, and topicality of the information. These GTC do not constitute legal advice and cannot replace such advice.