Minfy Technologies. Jr Full Stack Developer interview questions

I applied through a Linkedin post after that i got the call by a person from the company through trubo hire. told me to fill a form and then my interview was schedule on 14July the interview goes around 45min from basic to advanced. the review of my interview was mix good as well as bad so based on this my next interview it schedule with hiring manager on 17July(afternoon) the interview was basic and about how to collabrate with the team. I got the call and message that i have been selected/shortlisted and my next round is with HR of the company 17July(evening) it was about salary discussion and all and he congratulate me on getting selected and told me he need to talk with the company's(higher authority) about the salary and let me known on 18July i got the call form the person(turbo hire) that we have initiated you offer letter you will get it by 19July. then on 19Julyl(evening) i got the call from person that the company's(higher authority) want have a meeting with myself it's just a casual meeting nothing more i was told but after attending the meeting he starting asking the question on technologies and my previous work that fine the meeting/interview was good and i have given all the question and if don't know the answer of that question then i have told him that i don't know about it. There no review and all on 20th(afternoon) i got the mail form the person that the offer letter has been revoked and is no longer availabe In case you have any question reach out to person(turbo hire) email. (All the interview are recorded by turbo hire)