Asked for referral from LinkedIn, after asking for 493924739 companies, got one.

Analyst

Software Developer

I have an interview with NielsonIQ for Backend engineer (Java, Spring Boot etc.) post. 
I have ~3YOE. 
Anyone who has worked/interviewed there tell me what

I have an interview with NielsonIQ for Backend engineer (Java, Spring Boot etc.) post. 
I have ~3YOE. 
Anyone who has worked/interviewed there tell me what to expect? 
Will it be be more on DSA or Java/Spring concept more? And what should I prepare? 

Interview is in 2 days.

NeilsenIQ interview