Vegetable carts, flower shops, mom-and-pop stores: Small speakers that read out digital payment receipts are making fintech companies big money.

For farmers in Senegal who struggle to read or write, sending voice notes has unlocked a new world of collaboration across the industry.

Today, Voice User Interface is a significant part of a tech roadmap for businesses. Irrespective of the industry, businesses are realizing the benefits that VUIs bring in and are cashing in upon them. Given the complexity, designing a VUI requires know-how and experience with computer science, human psychology, and linguistics, along with cognitive learning.

It’s an important time to be in voice design, but it’s not without its own challenges. Content in voice-driven interfaces can vary wildly from that of traditional websites, which might …