Situation

Flexible solution

You need to fill a role for a fixed period of time.
Example: you need to cover someone's absence on maternity/paternity leave or you need someone while you do external recruitment for a position.

Vacancy on demand
Someone fully dedicated to your company, but only temporarily.

You need seniority and/or specific skills to work on a day-to-day basis, actively participating in the business for a certain period of time.
Example: you need to structure the financial area for a fundraising round.

Vacancy on demand
Someone to work a few hours and a few days a week on a long-term basis.

You have a critical deliverable and need an experienced person, but don't need or budget for someone full-time.
Example: creating the go-to-market strategy.

Vacancy on demand
Someone to structure the strategy over a certain period.

You have an important and critical project, but you don't have the experience to carry it out or you don't have enough internal resources.
Example: developing the company's organizational culture.

Project
A project on a specific theme, with a specific time frame, following a specific demand.

You need to develop your leadership in order to accelerate new challenges.
Example: I've promoted a professional and I need to accelerate their development in order to take on the responsibilities of the new role quickly...

Mentoring
Strategic meeting to guide or support development through the exchange of experiences and guidance.