CareerCup

Design a system which helps to calculate average Skype call duration per day. In which events are tracked from mobile app. Need to take care of all edge cases like events can be logged to server in any sequence & there can be some events missing on server side also.

Design online multiplayer generic board game (like chess). How will you store sessions.(RDBMS or REDIS) How will the
competitor be chosen and notified(HTTP or what?).
What are the appropriate classes?

Design Recommendation system. How will you generate generate recommendations for millions of users. DB Schema, How will you improve latency? if the user is searching a item, when will you show next recommendations. How will you update, latency basically and consistency.

You are provided with 2D char array. You have to provide the 2D char array as response which contains the multiplication od the input array. For eg: input=> {{a,b},{c,d}}, output => {{a,c},{a,d},{b,c},{b,d}}

You are provided with different Excel files and the data format those files contain. You are also provided with low level parser. You have to design a system which takes the excel file and its data type as the input and returns the list of Data objects in the file.

Design JProfiler. How will you design datastructure and why, function stacktrace. HLD+LLD

Design a Fresh Grocery System. Means Daily usable Items, you cannot store them in inventory like bread, milk etc.
HLD+ DB Schema + Concurrency issues + Scalable architecture. How will you scale to multiple countries

Design an order tracking system using the below constraints.

Once an order is received, it will be assigned to a delivery boy and sends notification at every stage of the order such as order received with expected time of delivery, delivery boy assigned, order picked up, order delivered.

State how your design will help scale and what will be the performance SLAs that will you will set for your design. The system should be able to horizontally scalable from hundreds of orders to million orders and should perform at almost the same level irrespective of the number of orders received.