买它meta最新电面过经DSA

昨晚刚面的买它DSA，全是新题，印证了我之前总结的一句话：运气差的人就不要迷信面经了，反正永远碰不到（or看不完），搞好自己技术才是最重要的！但是地里各位的面经让我对面试流程和出题套路有了预判，面试时一点也不虚。发个面经回报大家，说不定碰到原题呢～

面试官是很好的国人姐姐，interaction和follow up都很多，我面试完自己感觉也不错，第二天一早就收到pass email。顺便求一个亚麻ads组DS电面的面经，孩子是个菜鸡，听说要统计+ML快问快答，又有人说要考case，完全没头绪，救救孩子吧！！！
一上来先是product题：
1. 3 types of notifications: time critical(your friend is on live), feedback (ask what's your opinion on sth), security notification (password change ), how to define good quality notification and what data do you need?

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2. CTR is the primary metric and it goes down 10% from June to July, how to investigate?


[hide=150]
[hide=150]follow up question 1: what if all of them are not the answers (no data collection issues, no product launch, no competitor, impression stay the same, clicks decrease)
my answer: technical problems in click (users can't click) & decreasing relevancy (users don't want to click)
follow up question 2: a drop in specific day in day-over-day analysis, how do you tell if it's seasonality or novelty effect?
my answer: check previous year's data, market research data & popular novelty effect identification method



3. have a new notification for event, do we want launch this  feature or not?
4. what if one metric goes up and the other goes down

SQL:
table1:
userid | survey_date | response_type | response
123 | 2021-07-08 | impression | null
123 | 2021-07-08| response | 2
124 | 2021-07-08 | impression | null
124 | 2021-07-08 | response | 4

what's the overall response rate

table2:
user_id | country | reg_date
123 | 'Us'| 2021-01-01
are old users more likely to have more response? (可以找面试官要clarification)
return tenure|avg_response

就是这些！
tip1: 保持交流超级重要
tip2: all follow up questions are spontaneous so make sure you only say things you've thought thru

然后再跪求大神share亚麻ads组DS面经！！

lz你好，要不要一起准备onsite?

匿名者 发表于 2022-1-19 19:15
lz你好，要不要一起准备onsite?

可以呀 你啥时候面

谢谢楼主分享，刚刚面完，基本都一致。

yuci22 发表于 2022-2-14 16:43
谢谢楼主分享，刚刚面完，基本都一致。

如果你是IC3/IC4建议和recruiter确认是否还有hc，楼主很悲剧的过了vo没hc了...（如果有4YOE+请自动忽略我）

匿名者 发表于 2022-2-15 20:35
如果你是IC3/IC4建议和recruiter确认是否还有hc，楼主很悲剧的过了vo没hc了...（如果有4YOE+请自动忽略我 ...

如果过了vo没有hc了会等到有hc了给offer吗还是？

勇敢小怪兽 发表于 2022-2-24 19:47
如果过了vo没有hc了会等到有hc了给offer吗还是？

对 hr说一年内有hc再通知

楼主想请问下，一个metric up 一个 down 该怎么分析呢？能给个思路么，谢谢！

谢谢多少分