AT&T Interview experience
AT&T is a well-known American international conglomerate which was founded in 1983. It is a telecommunications company headquartered in Dallas, Texas, and operates in the technology, media, and telecom sectors. It provides services such as mobile and fixed telephony, broadband, and subscription television as well. Besides being a parent company of Warner Media, it is one of the largest entertainment companies worldwide by revenue and film producers too.
First round: Technical Assessment
In my final year of college, I attended the AT&T campus drive where they conducted a technical round for students eligible for it i.e., only Computer Science and Information Technology students were allowed to sit for this exam. It consists of 30 MCQs and 5 coding questions to be completed within 90 minutes.
Second round: Interview
After a few weeks, I got called for an interview through a Microsoft Teams call, which took around 60 minutes including both HR questions and technical questions. Both two rounds were brought together on the same meet. The interview panel had two members.
TR round: They wanted me to rate myself in both Python and SQL, asking about my knowledge of polymorphism, overloading vs overriding, and Python exceptions. Also asked about the awareness of AWS services. They asked me to write a sample code for runtime polymorphism in Notepad and explain how runtime works and compile-time work. They also enquired about AWS Lambda and Dynamo DB and the difference between these two services. They also asked to write two SQL queries and Python code to reverse a string word by word.
Three coding challenges were given to me which included counting duplicates in a list, counting the frequency of digits in a list, deleting duplicates in a list, and asking my approaches to solve those questions.
HR round: Asked me to explain my project technically, and talk about training dataset, testing dataset, and real-world application of our project. Also asked which libraries we used in our project, what is accuracy formula, uses of numpy and pandas.
NOTE: All questions asked here are based on my resume.