Languages

Java
Javascript
HTML
CSS
Kotlin
Scala
Clojure
Terraform

Frameworks

Spring Boot
Wicket
Vue.js
React

Platforms

Amazon Web Services (AWS)
Kubernetes
Docker
Google Cloud Platform (GCP)

Tools

IntelliJ IDEA
GitLab
Datadog
Kibana (ELK)
SpeedCurve
Jenkins
Jira / Confluence
Opsgenie

Databases & Queues

MongoDB
PostgreSQL
Apache Kafka
Elasticsearch

Methodologies

Self Contained Systems
Domain Driven Design
Reactive Programming
REST
CI / CD
DevOps
SCRUM / Kanban
XP