What should Ali pay attention to during the interview? Personal account of Alibaba interns who passed five rounds of interviews

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Preface

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Do a lot of java Small partners in development will have a sense of awe for big factories , I think entering Dachang is like a carp jumping over the dragon's gate , So many people dare not easily send resumes to big factories . But you know ？ The golden period of entering a big factory is within oneortwo years of your graduation , At this time, you generally don't have too high requirements for your skills , The longer you work, the higher your requirements . Today, I want to share with you a new Alibaba offer The programmer , How to get through Alibaba 5 Interview . I hope it can help more programmers who want to enter big factories .（ For ease of reading , Will be self described in the first person ）

background

Get Ali's internship offer, Experienced 5 Interview , among 4 Wheel technology ,1 round HR interview . Graduated from Central South University, majoring in information management , Really start learning Java It's in the second semester of junior year , Graduate students majored in mobile cloud computing of Beihang . Okay , Say nothing and enter the interview

Ali side

One side is in the morning 9 I have received more interviews from Alipay , Because it is the first telephone interview , The overall situation is still quite tense .

• Introduce yourself , No more than 3 minute （ Actually, my self introduction is less than a minute ）

• How much progress do you feel compared to your undergraduate level , What's the progress

• What is the greatest progress during the graduate period

• Which direction of development do you think you are suitable for

• synchronized And lock The difference between , Use scenarios . seen synchronized Source code of

• JVM Automatic memory management ,Minor GC And Full GC The trigger mechanism of

• Read about JVM No tuning , What is the basic idea

• How to design a storage system for mass data

• Implementation principle of cache , What should we pay attention to when designing cache

• Taobao's popular product information JVM Which memory area

• Page storage of operating system

• volatile How to ensure memory visibility of keywords

• happen-before principle

• Lucene The principle of full text search

• What kind of development do you think you are suitable for , Why?

• Where do you want to practice , Hangzhou ？

Ask the interviewer questions ：

1. Evaluate my performance in this interview

2. What should be added to my technology stack

3. Do you have a chance for the next interview

To sum up

One side, maybe 50 More minutes , I know from the interviewer that he is an old employee , Not much older than me , On the whole, the conversation was quite speculative . The last three questions I asked the interviewer , When answering whether there is still a chance for the next interview, say ： The competition is fierce , But there are still opportunities . It can be seen that one side of the problem is not very difficult , But to get a high opinion from the interviewer , It still needs a certain ability of expression and understanding of the comparative nature of technology , If you can make some appropriate extensions when answering questions , Naturally, the interviewer will have a different opinion of you . Follow certain steps to answer questions ： Answer the question first , In answering the specific details , Finally, do some usual programming extensions . such , It will make the interviewer feel that you have really worked hard on this technology .

Ali on both sides

Waited nearly 6 Tian finally received an interview call from Ali on Thursday of the second week . The second interviewer is a department head , This time the interviewer came up and asked , There is no one-sided interviewer so easy to talk .

• Introduce yourself , No more than 3 minute （ My self introduction is still no more than 1 minute ）

• You said you were familiar with concurrent programming , So tell me Java What are the types of locks , And the difference （ As expected, the depth is different ）

• How to ensure memory visibility

• Http Process and principle of request

• TCP Characteristics of the connection

• TCP How to make the connection safe and reliable

• Why? TCP Connection requires three handshakes , Not twice , Why?

• AOP Principle

• Dynamic proxy and cglib The difference of realization （ This , Very drunk ）

• Then you can talk about the implementation principle of agent

• seen Spring Source code , say something Ioc Loading process of container

• Do you know how to compile bytecode （ I don't know ）

Ask the interviewer questions ：

• Can you come to Hangzhou for an internship

• Evaluate my interview performance

• Do you have a chance for the next interview

• What do you think my technology stack should add , What aspects need to be improved

Two side summary

The questions asked by the two interviewers are quite direct , The answer is to know as soon as you know , If you don't know, you don't know . Part of these questions is the foundation , Part of it is based on your professional skills . After the interview, the interviewer commented on me as ： The compasses , Have a chance for the next interview .

Although it's in order , But when I heard the interviewer say that there is a chance for the next interview, I felt that this interview should be over . Although this interview has passed , But we should think about why the interviewer's evaluation is that the performance is regular . After the reply, I found that although the answer reached the point , But it doesn't scale enough , The understanding of some problems lacks enough practical experience . The interviewer told me , Have time to study the bytecode compilation process , as well as JVM Knowledge of tuning （ It's very important to emphasize this ）. Then it is for their own shortcomings , After the end of the face and into the crazy life of reading and writing code . Although it's normal that some of them can't answer in the interview , But if you can do it beyond the interviewer's expectation , It's also an important bonus for the interviewer .

Three sides of Ali （ Director face ） Three sides are separated from two 5 God .

It is said that the director will ask more about the project , So in these days of waiting, I specially combed the projects I have been in contact with .

• Self introduction. , No more than 3 minute （ This time it seems a little longer , It's just 2 More than minutes ）

• Tell me which project you are familiar with

• Why do you do this project

• What architecture does the project adopt , How to design database

• Which tables does the database consist of , Why do you have these watches

• What are the main core modules , How modules communicate with each other

• session where

• How to save session state , What are the ways 、 What's the difference

• Distributed session How to manage , What are your plans

• Have you studied data structure and algorithm （ Of course ）, You talk about the process of binary search

• Let's talk about the process , Write pseudo code

• Understand which design pattern , For example, in jdk Which source code uses your design pattern

• Do you have any questions for me （ Still the above three questions ）

Three side summary

I thought three sides were intersecting , I didn't expect to be interviewed by Ali's director . As the specific technical questions have been asked in the first two rounds of interviews , So there won't be any specific technical problems after three aspects , In short , We must go deep into the projects we have done , Including the technical principles used 、 Why use these technologies . For the project , The interviewer is only concerned about the following points ：

• How to realize a more important point in the project （ Need to go deep into the principles of Technology ）

• What's the biggest difficulty （ What are they? ）, How did you solve it ？

• If you need to extend a function , How to reduce the coupling of the system

• If you optimize for a function , How would you design and optimize

For projects written on your resume , I think about the above four questions , Will be able to do well in the interview . Because of any fraud in your resume , As long as the interviewer asks you in detail, you will be exposed . When I hear the interviewer say that there is a chance for the next interview , Naturally, I am very happy . All around Ali （ director ） Then I received a call from the Department Director at more than 4 p.m. the next day , The interview started after a simple communication . This interview is the most relaxing , There are no deep technical problems , It's like chatting with friends .

• Let's introduce ourselves , No more than 3 minute

• Introduce your most familiar projects

• What architecture does the project use , What are the highlights

• What courses do you usually study

• What is your current research direction

• Where is home

• What kind of books do you like to read

• When can I come to practice

Sum up on four sides

Although this side is easier , There are no specific technical problems , But the project is still the interviewer's focus , Later, I learned that in addition to looking at your foundation , It's mainly about your potential （ It's about the value of cultivation ）, This thing looks empty , But you can still see it from your usual study . therefore , As a developer , Usually the research on technology is also very important .

Ali has five sides （HR Noodles ）

It's a long way off 4 Days or so , Finally got HR The phone , I left Ali at this time offer It's not far .

• Introduce yourself

• What projects have been done

• Look, you said in the question that you saw a lot of merchants in Hangzhou using payment QR codes , What do you think of Alipay?

• So many people use Alipay every day. , If you can store this data , How would you design it （ Not to say that HR Don't ask technical questions ？ It's Ali's HR）

• What do you want to do in Alipay practice?

• How do your classmates evaluate you 、 The teacher?

• If there is disagreement with colleagues , How would you solve it

HR Surface summary In fact, about HR The final admission result of the interview has one vote of veto , So at this time, you should pay more attention to the following points ：

• Honesty first , So don't put any false information in your resume , The result of trying to get an interview through false information is not worth the loss

• HR Focus more on your ability to express 、 Ability to get along with colleagues and attitude towards work

• Do you have a clear career plan for yourself （ The premise is to have a clear positioning of yourself first ）

• On the issue of treatment （ Because of my internship position , So this one didn't mention , But as far as I'm concerned , Ability is the most important thing , When the ability comes up, the treatment will go up naturally ）

summary （ End summary ）

Can you get what you want offer In fact, it is inseparable from daily learning summary and reflection , You can see that Ali's interview is not only about technical knowledge , We should also have our own views , To impress the interviewer . Therefore, it is recommended that you read the source code of some frameworks , It will definitely be helpful for the interview .

Here I sort out some videos of the framework source code I usually watch + note , There are also many small partners who need to learn interview questions from large factories, who can pay attention to the small official account 【 Qing procedural ape 】 Self taking .

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