If this is the case, hiring an experienced and reputable firm is one of the best things you can do when looking for a web development company. The 7-step web app development process is depicted below.
Before you begin development, you must thoroughly research your idea to ensure market fit. Check that your app will add value to someone else's life by solving a real problem—in other words, that it is a real need rather than a want.
After you've identified a promising opportunity, spend some time defining what your app will do and how you'll do it. Ideally, you should be able to summarise it in one sentence. You may find yourself going through several rounds of mockups/wireframes, especially if your target audience doesn't always use technology in the same way.