Languages

JavaScript | Node.js | Python | Java | PHP | C / C++ | C# |
ASP.net | .NET Core | JYTHON | Ruby | Objective-C | SQL | PLSQL | Cobol | Lua | Go | Swift | JCL |
CICS/DB2 (mainframe) | ABAP (SAP)

Platforms & Cloud

LowCode (Outsystems / Appian / Mendix) | AIX | Linux | UNIX |
Windows | BPM/Workflows | MS Azure IBM Cloud | AWS | Google | VoIP (Kamailio | FreeSwitch | Asterisk) | RabbitMQ

Web & Mobile framework

iOS SDK | Android SDK | React Native | jQuery Mobile | Ionic |
React | Cordova | Meteor | Angular | J2EE

UX / UI
Databases

Relational MariaDB | Microsoft SQL Server | PostgreSQL | SQLite | Oracle

NoSQL Elasticsearch | MongoDB RethinkDB | Redis | Berkeley DB