Some high voted answers: On StackOverflow - focusing on : Back End : Core/Enterprise Java (Concurrency, Collections), Ruby, Python, Advanced SQL, Hibernate, Spring(AOP, ORM, IOC, MVC, Security, Enterprise Services), Redis, Stored Procedures, Load Balancing, Failover, Clustering, Relational/ No SQL databases. Android Mobile Platform : Functional Programming : Groovy SOA : Web Services (SOAP/REST), Spring REST and related stuff Front End : Java FX, Java Web-Mobile Components, MVC (Spring, Struts), Ajax, Angular 4, ECMAScript, HTML5, Native JavaScript, JFreeChart, RIA, Jquery, CSS, JSON, JSTL, Tag Libraries. Networking , Administration : Linux Kernel Services/Configuration, Linux Filesystem/Package/Account Management, TCP/IP, NFS, Clustering, Opsview. Big Data : Hadoop, MapReduce, Spark, HDFS, Pig, Hive, ZooKeeper, Sqoop Machine Learning : Supervised Learning, Pattern Recognition DevOps : Chef, Puppet, Ansible, ElasticSearch, Logstash, Kibana Data Science : R, Github Cloud : AWS, SaaS, PaaS,DBaaS, Docker, RedHat OpenShift Cloud Native : Rundeck, Cloud Formation No SQL : Document-Oriented (MongoDb), HBase, Column Oriented (Cassandra) Algorithms : Divide & Conquer, Graphs, Data structures(Heaps, Hash tables, Search trees), Randomized algorithms Scripting : Bash, Shell, Excel VBA. Search Engine Technology : Lucene Project Management : Agile, Scrum. OS : Ubuntu, Linux, Solaris, Windows. SCM : Configuration Management(Maven ,Ant), Continuous Integration.
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