Hi! Great question, and indeed, choosing the right vendor for software development outsourcing can be a real challenge. In my opinion, the key criteria for choosing a vendor are as follows. Firstly, the experience and expertise of the team. It is very important that the team has significant experience with the technologies you need, as well as successful projects in their portfolio. For example, if you need development on the .NET MAUI platform, it's worth considering companies with a proven track record like this
https://blackthorn-vision.com/technologies/net-maui-development-company/. Secondly, reputation and reviews. Be sure to research reviews from clients that the company has already worked with. Reviews can tell you a lot about the reliability and professionalism of the supplier. Thirdly, the cost and payment terms. It is important that the prices fit your budget, but you also need to consider value for money. Sometimes it is better to overpay a little for a better service than to have to deal with errors and mistakes later. Fourthly, the supplier's ability to meet deadlines and manage projects. The vendor should demonstrate a proven track record of delivering projects on time, as well as effective project management methodologies such as Agile or Scrum.