I was selected in campus recruitment process and I was given the start date with in two months of graduating. Interview process was smooth and simple with three rounds of interviews

Way too easy and short of an interview process to allow any "weeding out" of folks who may not be a good fit (for themselves or the company). I took the job, so was able to see my theory/concern proven correct: If they don't care about who's coming onto their team outside of pure "can you code in this language" skillset, they don't care about your growth or the quality of work they put out to clients. Plain and simple. They just want to know if you can code whatever language is in demand, outside of that there's no regard at all for any other skills (or lack thereof). Interview was really just having a conversation, no tough questions, just told them my background and that was about it. We discussed compensation and salary on the first interview before they even really knew what I was about or vetted any of my references/skills, which makes it difficult to negotiate anything. Additionally, I came to find out after my employment that they completely low balled me in my salary. I was coming from a start-up background and had been out of the more formal "corporate" game for 5 years so did not know what my asking price should be. The number I gave them was HALF of what my co-workers made (shame on me giving them the number!), but what was more concerning was that they went along with it. I can see if I named a price a bit lower than usual, but HALF? And not say anything? It felt kind of sneaky, like they knew I was worth more but wasn't going to tell me otherwise. A truly great employer with a quality culture and employee appreciation would not have taken advantage of my lack of frame of reference for the average industry compensation.