BrainRocket interview questions

I was interviewed in a 3 step interview process for Senior Software Engineer in Portugal. Process was fast paced which is good and eventually I passed the 3 phases. I received a confirmation from the recruiter saying they liked my application and would extend me an offer, but didn't do it right away. I waited for about 10 days without a response and eventually they said they reconsidered, out of nowhere, making it be a very disappointing experience overall.