Why this build, here
Most people here will use your app on a phone, on mobile data that drops. Streaming makes a slow answer feel fast, and good error handling is the difference between “it’s broken” and “try again”.
The build, step by step
Move the key to the server
Stream tokens to the page
Handle the bad network
Log every request
Deploy it
The steps, checks and practice open with a code
You can see what this lesson builds. The detail of each step, the finished-when checks and interview scoring come with the K850 practice, along with weekly build sessions and code review.
Read and run
Interview practice
Questions on this topic from AI Engineering Interview Questions, company-wise, with the companies it lists. Write your answer the way you would say it; Jev scores it and DeepSeek tells you what to add.
Scoring opens with an access code. You can still read the questions and prepare.