Business Visa - B1

Hello everyone

My business visa application rejected on 20th nov, below is my experience

I was asked to reach 20th counselor window, but number 16th was empty so counselor their called me while I was in the way So I approach that window

Me: Good morning sir
VO: Just nodded

VO: Your Passport?
Me: Here it is, I passed my passport to him

VO: Why you are going to US?
Me: Here I Heard "Why" as "Where" and answered Los angeles, CA.

VO: Asked in Hindi language, "Aap US kyu ja rahe hai"?
Me: Sir, My company is Migrating a new version of the web application to live server, to avoid any issue and deal with it in real-time my presence is required there, also they want to discuss and finalize some new features of the application.

VO: What is your company name?
Me: YYYY company

VO: How long you are working for this company?
Me: I have been working on this application from 4.5 years and my current company hired me 2 years back so that I can directly work with them

VO: What is your designation?
Me: Web developer
 

Meanwhile, from the second last question, he started typing and told me in last the "You are not qualified for the US visa"

I had a Company invitation letter at that time, but now I am thinking that why I had not given it to
the counselor with the passport.

I think he makes his mind from my 2nd or 3rd answer, Please let me know what are my mistakes for rejection and when I should reapply for the Visa

DS160 Form details
Salary 19L
Travel duration 20 days
Married (4 years)
Total Exp 8+ years
MCA