Of course there is always a certain amount of uncertainty if you have never done business together before. This is why I am sharing snippets of my day-to-day work on my web presence. They show what I am currently dealing with or have dealt with before.

Below, you will find an overview of different areas along with my (self-assessed) level of expertise.

How to interpret the "Level" information provided:

grade 5 or 4: (very) good level of expertise, active use within the last 12 months
grade 3: reasonable level of expertise, active use within the last 24 months
grade 2: starter-level knowledge, no active use in projects
grade 1: known, but no experience

Programming Languages

TopicLevel
Java💡💡💡💡💡
Javascript💡💡💡💡
Swift💡💡💡💡💡
Python💡💡💡💡
Go💡
Kotlin💡💡
Objective-C💡💡💡💡
PHP💡💡💡

Frameworks/Platforms

TopicLevel
SpringBoot💡💡💡💡💡
Docker💡💡💡💡💡
NodeJS (express,async,winston,mocha,loggly,..)💡💡💡
Angular💡💡💡
React💡💡💡
Bootstrap💡💡💡💡
Jquery💡💡💡

Tool Chain

TopicLevel
Git/GitHub/GitLab💡💡💡💡💡
Maven💡💡💡💡💡
Gradle💡💡💡
Jenkins💡💡💡💡
Gitlab CI💡💡💡💡
Robot💡💡💡💡

Infrastructure Components

TopicLevel
Elasticsearch, Logstash, Kibana💡💡💡💡💡
Prometheus, Grafana💡💡💡💡
Traefik API Gateway/Proxy💡💡💡💡
Apache httpd💡💡💡💡💡
Tomcat💡💡💡💡💡
JBoss, WildFly💡💡💡
Keycloak💡💡💡💡
ActiveMQ💡💡💡
Artemis💡💡💡💡
Kafka💡💡💡

Hosting

TopicLevel
Linux-based self-hosting💡💡💡💡💡
AWS💡💡💡💡
IBM Softlayer💡💡💡💡
Microsoft Azure💡💡💡
Google💡💡
Docker💡💡💡💡💡
Kubernetes💡💡

Domains

TopicLevel
Microservice Architecture💡💡💡💡💡
API Design💡💡💡💡💡
Domain Driven Design💡💡💡💡💡
Mobile Payment💡💡💡💡💡
Mobile Application Development💡💡💡💡

Other Expertises

TopicLevel
IT Project Management💡💡💡💡💡
Solution Architecture💡💡💡💡💡
Team Building💡💡💡💡💡

Languages

LanguageLevel
German (mother tongue)💡💡💡💡💡
English💡💡💡💡💡
French💡💡