What do you feel is the most important skill an application developer should possess?

An interviewer will ask this type of qualifying question to gain some insight into your skillset and your ability to be introspective. This helps them determine if you are qualified for the job and if you will fit into the organization's culture. This is a relatively easy question because they have already indicated what skills are important to them in the job posting. Another reason is that your skills are listed in your resume, so they already have some idea about these. The best answer is to state the skills in both the job posting and your resume and provide the reason why these are important.

"The most important skill an application developer can possess is adaptability. Application development is a dynamic profession that changes quickly. New tools and technologies are constantly being developed, and methodologies evolve quickly. In addition to this, the design criteria and requirements for applications can change during the development process. Developers need to be flexible and adapt to all these changes as part of their daily jobs and responsibilities. "