Introduction
First of all, is it really getting harder and harder for Android to find a job? This is probably what everyone is most concerned about. This is affected by the large economic environment and the development prospects of the industry, and it is also related to personal factors. Recently, on the one hand, it is difficult to recruit suitable Java developers for the company where you work, and there are few people who submit resumes. On the other hand, people around you often say that it is hard to find a job on Android and iOS, especially if you have no experience. Yes, with less experience! It's hard to find, but in Changchun, the capital of Jilin Province where my home is located, I can get 10,000+ in Unity3D+Maya, and I did Maya before, and I just switched to Unity3D this year; it’s also in Changchun, c# has worked for several years The salary of experience can also reach 8K+, and it is difficult to recruit people, which makes me want to go back to my hometown to develop.
First of all, is it really getting harder and harder for Android to find a job? This is probably what everyone is most concerned about. This is affected by the large economic environment and the development prospects of the industry, and it is also related to personal factors.
Share a few recent real interview questions about performance optimization from Alibaba, and see how you master this one? If you can answer, in terms of performance optimization, you will at least exceed 80% of your classmates.
1. In the double 11 high concurrency promotion scenario, why can only place orders instead of refunds?
Answer ideas: (service degradation, etc.)
2. From what angles can Alipay system optimize and improve performance?
Answer ideas: (cache, asynchronous, distributed, etc.)
3. How to complete quick statistics on Tmall’s hundreds of millions of product data?
Answer ideas: (Fork/Join task splitting, etc.)
4. How to optimize the transfer and withdrawal function of Alipay?
Answer ideas: (consistency, high-throughput scheme, etc.)
5. Taobao network jitter, how to avoid users from placing orders repeatedly?
Answer ideas: (idempotence, etc.)
Performance optimization is a large area. Performance optimization of applications, as well as front-end optimization, architecture optimization (distributed, cache usage, etc.), data storage optimization, code optimization (such as design pattern optimization), etc.
The key technical points for high concurrency on Double 11 include service degradation, caching, asynchrony...idempotence and other technical categories. The technology BAT commonly used on the Internet is no exception.
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Based on salary treatment, with development as the ultimate goal, we must seek the best development in places with high salaries!
Below are some advanced information compiled by several Android industry leaders corresponding to the technical points above. There are ** Android architecture video + BATJ interview topic PDF + core notes and other materials . Hope to help you improve your technology. If you want to get it, you can privately message me [666] to get it for free**
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