UX/UI Design
Balsamiq, Sketch, Adobe Illustrator, Adobe Photoshop, Abstract, Principle, Invision, Zeplin
Front-end
React-JS, AngularJS, JQuery, AJAX, Bootstrap, SASS, LESS, JavaScript, HTML 5, CSS3
Back-end
Java, PHP, C#, Python, R, Ruby on Rails, Scala, GoLang, REST full API, WebSockets, WebRTC, SignalR, Web Services, WebAPI, OAuth, Spring, NHibernate, Hibernate, YII, Laravel, iText, pd4ml, Play Framework, NodeJS
Mobile
Objective-C (iOS, Mac OS), Swift, Android SDK, ReactNative, Ionic
Protocols
DALI, EnOcean, Mbus, Wmbus, Zigbee, HL7, TCP/IP, UDP, SOAP, JSON, SIP, RTP, RTCP, HTTP, FTP
Databases
PostgreSQL®, MongoDB, Cassandra, Redis, SQLite, Oracle®, MS SQL Server®, MySQL®
Servers
Apache, Nginx, Apache Tomcat, GlassFish, Jetty, Netty, WildFly, IIS
Cloud
Amazon S3, Amazon Cloud, IBM Bluemix, Hadoop, Microsoft Azure
IOT, Low level development
Visual C++, C++, C, Boost, WDK, WxWidgets, QT, Assembly language
Computer vision and Data science
OpenCV, DLib, Tensor flow, CUDA, DeepDetect, OpenNLP, Storm, Spark, Hadoop, SystemML, Stanford Classifier, SmileMiner, DirectX, OpenGL, QT, Cognitive services from Amazon, IBM Bluemix and Microsoft Azure
Build Tools
MAVEN, ANT, Gradle, SBT, Composer
Operating systems
Windows family, Linux family, iOS, MacOS, Android
Testing
Selenium WebDriver (web applications automated testing), Winium (Windows desktop applications automated testing), Appium (Mobile applications automated testing), SikuliX (OCR), Cucumber, TestNG, Allure (BDD), Vagrant, Docker, Jenkins, JUnit, codeNforcer (code review and code quality)
Methodologies
SCRUM, Agile, Extreme Programming, RUP