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Ahmed Aljaberi
@ahmed_aljabri
, 7 tweets, 2 min read Read on Twitter
في أحد المؤتمرات صرح احد المتكلمين من شركة فيسبوك ان فيسبوك توظف فقط
Full Stack Developers , هناك مؤيدين و هناك معارضين لهذا التوجه و الذي قد يربح بعض الشركات بتقليل التكاليف من خلال الحصول على موظف يقوم بعدة ادوار بمرتب واحد .
في هذا الThread سأشرح ماذا يعني المصطلح باختصار .
يرتبط مفهوم الFull Stack مع تطوير تطبيقات الويب , في البداية هناك ما يسمى Front-End Developer و المسؤول عن تطوير الجزء الخاص بالUI على المتصفح و يحتاج إلى التقنيات التالية بالترتيب :
HTML
CSS
Bootstrap
JavaScript, JQuery
Less or Sass
Angular or React or Vue
هناك بدائل اخرى لما سبق لكن ربما هذه هي الاشهر .
ننتقل الان إلى الBack-End Developer و وظيفته تزويد الFront-End Developer بما يحتاجه من بيانات ليعرضها من خلال Api . هذا الApi يمكن تطويره بكثير من اللغات من خلال frameworks . و لذا يحتاج ايضا لمعرفة بأحد قواعد البيانات .
يمكن على سبيل المثال استخدام لغة Java مع Spring frameworks او Python مع Django او PHP مع Symfony . او لغة سي شارب مع asp.net . او nodejs مع Express او Ruby on Rails و غيرها كثير .
بقيت لدينا الDatabase و هي قسمين إما RDBMS مثل اوراكل و SQL Server و MySQL و Postgres او تكون من نوع NoSQL مثل MongoDB او CouchDB او Cassandra او neo4j او Firebase حسب احتياجات النظام .
ما يحصل باختصار ان الBack-End Developer سيقوم بإنشاء RESTful Api يتعامل مع قواعد البيانات او اي مصادر اخرى . و يجعلها جاهزة لاستقبال الطلبات من الFront-End Developer و التي أنشأها له Angular او Reactjs او Vue بصيغة json .
الFull Stack Developer هو الذي يجمع الوظيفتين السابقة بالإضافة إلى معرفة بالDevOps و تشمل ادارة المشروع و ادارة الخوادم و تجهيزها و رفع النسخ و غيرها .
هذا النوع من المطورين مطلوب في كثير من الشركات الصغيرة و المتوسطة و حتى الكبيرة احيانا كما في مثالنا عن Facebook .
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Ahmed Aljaberi
@ahmed_aljabri
بما أنا ضيوف تويتر , فسأبدأ بشرح مختصر لبعض التقنيات التي يستخدمها و لماذا , احب ان انوه إلى أن تويتر بيئة ديناميكية أي تغير تقنياتها بسرعة و لذا سأكتب باختصار عن ما استطعت رصده من خلال مدونات مهندسي تويتر و متكلميهم في المؤتمرات بالاضافة إلى المقالات العامة .
في البداية عندما نكتب twitter.com و قبل ان نصل إلىه كانت تتلقفنا خدمة GeoDNS التي تقوم بمعرفة موقعنا الجغرافي من خلال IP المتصل ثم تحوله لDataCenter الأقرب له , غيرّها تويتر لاحقاً و استخدم BGP Anycast
اشترك Twitter في تلك الخدمتين المزودتين للDNS لأجل السرعة .
و صلنا إلى اقرب DataCenter وواجهنا في البداية Web Server من نوع Nginx على Linux, لكن تويتر لا تستخدمه كـweb server و انما كـLoad Balancer . و ظيفته توزيع الطلبات و الحِمل على اكثر من Web Servers .
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