What I Learned from My Alibaba CBU Technical Interview: A Detailed Self‑Review

Preface

Today I share a self‑summary of my Alibaba CBU technical interview, hoping it helps job seekers preparing for interviews. 人生中第一次求职面试 The interview consisted of four parts: self‑introduction, professional basics, development experience, and questions for the interviewer.

1 Interview Record

1.1 Self‑Introduction

前一天晚上准备的自我介绍

I am Hu Wenxing, a graduate of Shanghai University of Electric Power, majoring in Electronic Information Engineering. I consider myself a geek with solid computer‑science fundamentals and a passion for solving real‑world problems with code.

In high school I solved a difficult Sudoku puzzle by writing a program on a classroom computer. Later, during university, I attended two Alibaba Cloud Yuncai conferences, contributed to an IoT smart‑lab project that placed in the top five of Alibaba Cloud's IoT Innovation Competition, and won national awards in NXP smart‑car contests.

For my graduate entrance exams I built a Python/Qt5 application that used the Evernote API to organize exam wrong‑question notes, automatically extracting questions from PDF files with OpenCV, syncing them to a local database, visualizing mastery levels with pychart, and generating PDFs with QR‑coded links to Evernote.

This project later became my graduation design: a "Smart Question Bank under Micro‑service Architecture" deployed on Alibaba Cloud serverless, leveraging Ant Financial's Alipay third‑party login and my front‑end/back‑end deployment skills.

If I join Alibaba's CBU, I will uphold the company's culture of intelligence, resilience, optimism, and self‑reflection while serving countless SMEs and consumers.

1.2 Professional Basics

专业基础中穿插了开发经验。

1.2.1 Data Structures

答的还可以

最小生成树的题目

– building a water‑supply system for multiple villages using classic Prim and Kruskal algorithms. 链表和数组的区别 – arrays excel at random access and binary search, while linked lists are better for frequent insertions and deletions. Hash表 – Python dict and Java Map are hash‑based key‑value stores, using space‑for‑time trade‑offs and collision‑resolution methods such as chaining and open addressing.

1.2.2 Concurrency and Distributed Systems

答的一般

I described multithreading with semaphores for mutual exclusion and synchronization, and mentioned using Celery with Redis and RabbitMQ for distributed task processing, though I did not discuss implementing coroutines with yield.

1.2.3 HTTP

答的一般

I implemented a file‑upload server using HTTP PUT, and previously built HTTP GET/POST requests on an ESP8266 module, understanding the basic request methods (GET, POST, PUT, DELETE).

1.2.4 Operations

答的一般

When a server in a cluster shows high memory or CPU usage, I would investigate processes, check logs, profile resource consumption, and consider scaling or optimization.

1.2.5 R&D Process

I discussed many technology selections but was advised to first clarify real requirements before choosing tools.

1.2.6 Information Security

还可以

I explained SQL injection, XSS, CSRF, and HTTPS; the latter two were only named without deep detail.

1.3 Questions for the Interviewer

I asked about the differences between Python Flask and Java Spring Boot; the interviewer noted Flask is rarely used in high‑traffic industrial scenarios, while Java's ecosystem is battle‑tested.

2 Feelings

The breadth of my technical knowledge is acceptable, but depth is lacking; I need to align more closely with Alibaba's Java stack.

3 Future Effort Directions

3.1 Third‑Party Agreements

I plan to clarify the details of third‑party agreements for campus recruitment.

3.2 Strengthen Core Knowledge

Quickly master Java backend technologies

Study Spring source code

Experiment with database connection pools

Review data structures comprehensively

Learn elliptical curve encryption

Implement coroutines with

yield

3.3 Target Large Tech Companies

Prepare tailored self‑introductions for Baidu, Tencent, ByteDance, Huawei, and consider roles at education platforms such as 作业帮, 猿辅导, and 口袋考研题库.

4 Thanks

Grateful to my family, university, teachers, seniors, and teammates for their support throughout this journey.