Very strong in Unix/Linux system development. Strong network programming, TCP and datagram sockets. Posix threads. Daemon servers. C++ Template library. Forking and pipes. Emacs extensions in Lisp. GNU debugger.
Experience with IntelliJ, Eclipse, Spring, Spring boot, Tomcat, JBoss, Maven. Testing with JUnit, Mockito.
Some experience with Objective-C. I wrote an iOS app to associate contacts with locations and sort who you want to call based on where you are.
Worked with MySQL, Oracle, SQL Server, Java Persistence. Entity relationship diagrams. Database design and normal forms.
Amazon Web Services
Familiar with Amazon console, RDS, Auto Scaling, S3. Attended AWS re:Invent 2015.
Agile methodologies and tools
Formal grammars and computational linguistics
Wrote LR/LALR parser, regular expression parsers with NFA/DFA minimization. Worked on various systems to recognize people, places, and organizations by name, and to find addresses, email, and other common patterns in text, index them, and discover relationships between them. Several recursive descent parsers.