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I'm a programmer managing my own tiny company. SIer .. I think this word is Japanese specific .. are mainly developing some in-house systems for domestic enterprises like accounting, hr, ordering, manufacturing and so on. SE .. it's an also specific funny word. The main mission of these "engineers" is listening requests or orders from their customers, and making documents for "programmers". In-house systems like accounting have very long lives more than 10 years. These long terms make technique old. But that don't mean business getting old. I imagine your work in Shanghai will be reading mails or documents from Japan and order developing to Chinese programmers, or you are the programmer. 小さな会社を経営しております。プログラマーです。 SIer・・というのは日本に特有の言葉だと思います・・は、だいたい日本国内の社内向けのシステムを開発しています。会計、人事、受発注、生産管理などです。 SE・・これも、日本固有のヘンテコな言葉です。「エンジニア」の主なお仕事は、顧客企業の話を聞いて「プログラマー」に渡すドキュメントを作ることです。 社内システムは、だいたい寿命がとても長く10年以上が普通です。そんなに長いと技術は古くなります。ただ、それはビジネスが古くなるということではないです。 上海でのお仕事は、日本からのメールやドキュメントを読んで、中国のプログラマーに指示を出すことか、あなたがそのプログラマーであるかだと思います。
I'm japanese. So, my English is not good. I have worked at SIer for a few years. System engineers who work in a Japanese SIer company construct computer systems used by companies. In many case, Japanese companies can't construct necessary computer systems themselves. So they order system development to SIers. They construct systems that automate customer's daily work. In particular, first, the engineers question an operating process that the customer work daily. Second, they make requirement definition documents. Next, design, develop, test systems. Also, It is a very important work for them to manage a project. On the other hand, web engineers who work in internet companies like mercari, Rakuten construct their own web services. If you don't want to construct systems for customer companies , you are recommended to choose TOP 500 chemical enterprise.