Foreword:
The workplace is like a besieged city. Every one of us in the workplace always admires the world "inside the wall" from the perspective of "outside the wall", and maybe your life also appears in the dreams of others.
Today, I will share with you the voice of a byte employee in the workplace. Let us understand the most true inner thoughts of byte-level employees.
Recruitment of internal employees after entering the job: The difficulty of interviewing the byte is just like entering the 985 University. What are the specific aspects?
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First of all, resume screening. General resumes can't pass the screening at all. Basically, they must satisfy key universities + experience in large companies + experience that meets the growth years.
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Let me talk about the project experience first, which can kill you. If you have been working for about three years and still remain in the thinking of the executor, it is basically over. You have to think more deeply, even if you haven't done it before, you have to think to people above P7.
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Let's talk about the code. It is basically the same difficulty as BAT manufacturers, but it is worth noting that as long as it is technical (including testing), the difficulty is the same regardless of age. Good luck, can encounter the problem of leetcode, bad luck. I can't understand the topic.
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The basic knowledge part, this will be hell. What open source framework, architecture design, principle model. Ask you design patterns, event distribution, and HashMap are all light.
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Other parts, including test questions, career planning, etc., are not simple and easy, and a little carelessness is a pitfall. Falling will not be long-term planning, low potential, poor plasticity, and growth that does not meet the evaluation of the number of years.
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Finally, you may come in and find out what is meant by interviewing an aircraft carrier, come in and screw the screws.
Tucao return to Tucao, I know that many of our programmers have a dream of a big factory, not only because the big factory’s business model is very mature, and it is very attractive to talents, generally there are experts in the industry to lead you, and in addition, we are pessimistic. , Even if your team is doing poorly, the result is nothing more than organizational structure adjustment, and you will not be laid off or cut in minutes.
So, how can we enter the big factory?
1. Understand the talents needed by big factories
To enter the big factory, we must first understand what kind of talents the big factory needs
From the above recruitment information, we can clearly understand that the job requirements of Bytedance need to be mastered:
Advanced technology of JAVA, kotlin, C++, SDK and so on.
Friends who often go out for interviews know that interviewers at large factories like to ask the bottom of the story, and will never stop until you have nothing to say.
2. Understand the technology needed by big factories
In order to help you break through your own bottlenecks in a short time, I am here to organize an advanced 60W+ annual salary for everyone, the growth curve of Android senior engineer, and the learning materials at the end of the article (if you can’t see clearly, you can privately message me to get a clear Picture)
3. How to study systematically?
As an Android developer, next I want to share with me some generalizations and summaries of the technology over the years, and share with my notes on those skills that I need to master as an Android senior developer, hoping to help me with the technology Friends who walked all the way to the dark on this road!
1. Advanced UI, custom View
The knowledge of UI is currently the most users. The Android introductory training that was so popular that year, you can find a good job by learning this little piece of knowledge.
However, it is obviously not enough now. Reject the endless CV, go to the actual project, read the source code, and study the principle!
2. NDK module development
Today, short video apps are booming and flourishing. With the rise of short video, more and more attention has been paid to audio and video development, and the salary is rising. Taking first-tier cities as an example, the salary of audio and video engineering development is 40% higher than that of Android application layer development.
The content mainly involves the following aspects:
- NDK module development
- JNI module
- Native development tools
- Linux programming
- Low-level image processing
- Audio and video development
- Machine learning
3. Data structure and algorithm
Why study data structure?
This is because all programs essentially process data. How to process data efficiently depends on the structure of the data itself (such as type (integer, floating point, etc.), dimension, and whether it is a complex type (structure) Type, class type), etc.) and the logical relationship between the data (linear, non-linear, etc.).
The data structure is inseparable from the algorithm, and the designed data structure is for the smooth and convenient implementation of the algorithm.
4. Java Advanced and Core Principles
The mainstream language for Android APP development is the Java language. The biggest feature of the Java language is to increase the possibility of software interaction. It can be said that almost all applications on Android phones are written in the Java language.
One hundred percent, all companies, large and small, must ask Java-related interviews.
The content mainly involves the following aspects:
- HashMap
- ArrayList
- LinkedList
- Hashset source code analysis
- Memory model
- Garbage collection algorithm (JVM)
- The difference between garbage collection mechanism and calling System.gc()
- Class loading process
- reflection
- Multithreading and thread pool
- Design Patterns
- Java generics,
etc...
5. Advanced Flutter technology
2019 is undoubtedly a year in which Flutter technology is in full swing.
Every mobile developer is crazy about the features and concepts of "rapid development, expressive and flexible UI, native performance" brought by Flutter, from super apps to independent apps, from pure Flutter to hybrid stacks, developers We are enthusiastic about exploring and applying Flutter technology in different scenarios, and we are also facing a variety of different challenges.
The main points of this article:
1. Overview of Flutter cross-platform development
2. Building Flutter development environment in Windows
3. Writing your first Flutter APP
4. Getting started with the Flutter Dart language system
6.360-degree performance tuning in all aspects
With the iteration of product content, the functions become more and more complex, and the UI pages become more and more abundant, which also becomes an obstacle to smooth operation. In summary, the performance optimization of APP has become a comprehensive quality that developers should have, and it is also a guarantee for developers to complete high-quality application works.
1. Design ideas and code quality optimization
2. Program performance optimization
- Start-up speed and execution efficiency optimization
- Layout detection and optimization
- Memory optimization
- Power consumption optimization
- Network transmission and data storage optimization
- APK size optimization
3. Optimization of development efficiency
- Distributed version control system Git
- Automated build system Gradle
4. Project actual combat
- Start speed
- Fluency
- The practice of Douyin's APK package size resource optimization
- Full analysis of Youku's responsive layout technology
- Network Optimization
- Revealing the Secret of the Performance Optimization Project on Taobao Double Eleven
- Analysis of source code dependence of AutoNavi APP full link
- Sharing of actual combat experience of completely eliminating OOM
- WeChat Android terminal memory optimization practice
7. Framework refined kernel analysis
As we all know, Android is an operating system based on Linux. But for the Linux kernel, Android is just an application running on the kernel, and there is no difference from other applications running on the kernel.
Therefore, Android also needs a running environment, and the Linux kernel needs to load the resources needed for the Android Framework to run after the startup is complete. Only after the Framework is initialized can the corresponding APK application be started.
The main content includes:
- In-depth analysis of Binder
- In-depth analysis of Handler
- Dalvik VM process system
- In-depth analysis of WMS
- PackagerManagerService
