What are the key considerations and challenges we need to consider while migrating Informatica to Talend?
Also if you can share some kind of case study would be great.
Please see the following resource on talend.com
So far, there is no an easy way to convert Informatica ETL Jobs to Talend.
As this related topic suggested, you need to redesign from scratch.
Here are some related topics:https://community.talend.com/t5/Design-and-Development/Migrating-workflow-from-Informatica-to-Talend... and
Feel free to let us know if it is OK with you.
Introduction to Talend Open Studio for Data Integration.
Practical steps to developing your data integration strategy.
Create systems and workflow to manage clean data ingestion and data transformation.