Status: Software Engineer, 5 YOE\nPosition: Senior\nLocation: San Francisco, CA\nDate: March, 2020\n\n**Round 1: (1 hour)**\nGiven an time window(start, end) withing which the courier works and an array with start and end times of delivery on x-axis. Courier is at (0,0) and can only do one delivery at a time. Find out the max number of deliveries which the courier can undertake.\n**Example:**\n```\ntimeWindow: [1, 50]\ndeliveries: [[1, 5], [10, 25], [17, 21], [30, 60],[11, 16]]\nans: 3 deliveries {[1,5],[11,16],[17,21]}\n```\n**Round 2: (1 hour)**\nI could not complete this in 30 mins. \nImplement (code) a Key value store with transactions. Write test cases\n```\nFollowing api to be supported: \nSet\nGet\nDelete \n/*for transactions*/\nBegin\nCommit\nRollback\n```\nMy idea was to have a Map with key & List of values. When the modifications are done outside of transactions, I will update list index 0. Within a transaction I will update list index 1. When commit is called I will update list index 0 with list index 1 & delete list index 1. For some reason the interviewer was not convinced with this. I am looking for suggestions. \n\n**Round 3: (1.5 hour)** **Lunch Interview**\nBehavioral questions\n\n**Round 4: (1 hour)** **System Design**\nDesign FB messenger style chat system with support for group chats\n\n

Status: Software Engineer, 5 YOE\nPosition: Senior\nLocation: San Francisco, CA\nDate: March, 2020\n\nRound 1: (1 hour)\nGiven an time window(start, end) within