1. Business visitor or productive work?
Meetings and negotiations are fundamentally different from physically installing, commissioning or servicing equipment. Companies should assess what the employee will actually do in Germany, not just what the invitation letter calls the trip.
2. Visa and work authorization must match the real activity
Permission to enter Germany does not automatically authorize every type of productive work. Nationality, duration, activity and contractual setup all matter.
3. Do not treat A1 as a universal certificate
A1 is mainly a European social-security coordination instrument. Employees sent directly from China require a different assessment under the applicable social-security rules and any relevant bilateral arrangements.
4. Working time still applies during commissioning
Project deadlines do not override German working-time requirements. Long commissioning days, weekend work and insufficient rest periods need to be planned carefully.
5. Customer-site rules can block an otherwise ready engineer
Large German industrial customers often require site registration, safety training, access cards, named personnel, insurance proof, contractor documentation and working-time records.
6. Who is actually directing the engineer?
If personnel formally remain employees of one company but are effectively integrated into another company's organization and directed like its own staff, additional legal questions may arise.
7. Use a deployment checklist
A practical review should connect person, activity, duration, location, immigration, employment, social security, working time, customer-site requirements and contractual structure.
Final thought
Successful market entry is not one isolated legal or sales decision. It is the coordinated design of organization, compliance, customer execution and local capability.