The developer says your solution is unfeasible. What are your actions?

If a developer says that a solution is unfeasible, you should:

1. Listen and understand the reasons — technical limitations, complexity, resources.
2. Collaboratively analyze the problem, possibly suggest alternative options.
3. Check the requirements — maybe some parts can be simplified or changed.
4. If necessary, involve other specialists (architects, team leads) for assessment.
5. Explain the business value of the solution to find a compromise.

It is important to maintain a constructive dialogue and seek a joint solution, rather than insisting on your own without arguments.