What is the name of the position of a specialist responsible for the technical part of a hardware project?

Question

Iron

Hello!
I have an idea to make a hardware project. There is an understanding that I can’t cope on my own and therefore I want to attract a person to the team who would be responsible for the technical part of the project. I, in turn, plan to focus on marketing / sales / fundraising.
Question:
What is the name of the position of a specialist who will be fully responsible for the technical part of the device being developed?
Responsibilities:
- Managing a development team / self-development / attracting freelancers
- Selecting a device implementation solution
- Designing the mechanical part of the device
- Designing the device electronics
- Industrial design, etc.

Answer 1

Technical director, chief engineer.
Here he is already selecting a team in order to achieve some results.