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Instructions The Kamcord SDK (software development kit) is currently integrated in over 400 mobile games. A user playing one of these games may elect to record and share a gameplay video via Kamcord’s technology. The sharing process involves pulling up our UI screen, which enables the user to share to various social networks, watch other videos, and make a profile. One of the metrics we use to measure the performance of our SDK is Day­7 UI retention. We define Day­7 UI retention as the percent of users who re­open the Kamcord UI exactly 7 days after the date of their first Kamcord UI open. Note that whether a user re­opens the Kamcord UI on Day 6 or Day 8 is irrelevant to this metric. For example, say we were looking to measure Day­7 UI retention over the first two days of October 2014. Twenty users opened the Kamcord UI for the first time on 10/1. On 10/8, four of these twenty users re­opened the UI. On 10/2, five users opened the Kamcord UI for the first time and two of these users re­opened the UI on 10/9. The SDK’s Day­7 UI retention from 10/1 to 10/2 would then be (4+2) / (20+5) = 24%. Attached is a csv file with sample SDK data from a subset of users who began using the SDK in September. The fields provided are: ● user_id ● event_name ○ Opening the Kamcord UI has event_name UI_OPEN_COUNT ● event_count ○ Represents the number of times an event occurred ● event_time ● os_name ● sdk_version We would like you to perform the following: 1. DesignamodelforthedatathatisdesignedtoallowausertoqueryforDay­7UI retention over a day range, as well as allow for filtering on a specific OS name and SDK version. 2. Writeascriptthatreadsthedatafromthecsvfileintoyourmodel. 3. Useyourmodeltoanswerthefollowingquestions: a. WhatwastheoverallDay­7UIRetentionoverthemonthofSeptember? b. WhatwastheDay­7UIRetentionfromSeptember8throughSeptember 10 for the Android SDK?  c. What was the Day­7 UI Retention over the month of September for version 1.7.5 of the iOS SDK?
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Backend Software Engineer

Interviewed at Kamcord

3.8★
May 4, 2015

Instructions The Kamcord SDK (software development kit) is currently integrated in over 400 mobile games. A user playing one of these games may elect to record and share a gameplay video via Kamcord’s technology. The sharing process involves pulling up our UI screen, which enables the user to share to various social networks, watch other videos, and make a profile. One of the metrics we use to measure the performance of our SDK is Day­7 UI retention. We define Day­7 UI retention as the percent of users who re­open the Kamcord UI exactly 7 days after the date of their first Kamcord UI open. Note that whether a user re­opens the Kamcord UI on Day 6 or Day 8 is irrelevant to this metric. For example, say we were looking to measure Day­7 UI retention over the first two days of October 2014. Twenty users opened the Kamcord UI for the first time on 10/1. On 10/8, four of these twenty users re­opened the UI. On 10/2, five users opened the Kamcord UI for the first time and two of these users re­opened the UI on 10/9. The SDK’s Day­7 UI retention from 10/1 to 10/2 would then be (4+2) / (20+5) = 24%. Attached is a csv file with sample SDK data from a subset of users who began using the SDK in September. The fields provided are: ● user_id ● event_name ○ Opening the Kamcord UI has event_name UI_OPEN_COUNT ● event_count ○ Represents the number of times an event occurred ● event_time ● os_name ● sdk_version We would like you to perform the following: 1. DesignamodelforthedatathatisdesignedtoallowausertoqueryforDay­7UI retention over a day range, as well as allow for filtering on a specific OS name and SDK version. 2. Writeascriptthatreadsthedatafromthecsvfileintoyourmodel. 3. Useyourmodeltoanswerthefollowingquestions: a. WhatwastheoverallDay­7UIRetentionoverthemonthofSeptember? b. WhatwastheDay­7UIRetentionfromSeptember8throughSeptember 10 for the Android SDK?  c. What was the Day­7 UI Retention over the month of September for version 1.7.5 of the iOS SDK?

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