Linux
Bash / Shell scripting
HTML / CSS / SASS / Bootstrap / Tailwind
Python (Flask, Django, FastAPI)
Git
Node.js
Web applications
Vue.js / React
System architecture design
Server management
AWS (Lambda, API Gateway, DynamoDB, S3, WebSockets, etc)
Implementing web services
REST / SOAP / GraphQL APIs
DynamoDB, MongoDB, MySQL, SQL Server
JavaScript (ES6+)
System design
Docker