Coding

Language

Java 10

Python 10

SQL + MQL 8

Bash 8

JavaScript (Node.js) 6

C# 5

Frameworks

Spring Boot 10

Maven 10

Django 10

Celery 10

GraphQL 8

Observability

Newrelic 10

Grafana 10

Splunk 10

Kibana 7

Cloudwatch + Cloudtrail 7

Database

Database engines

Apache Cassandra 10

MongoDB 10

DynamoDB 10

PostgreSQL 10

MySQL 8

Redis 7

Elasticsearch 6

Elassandra 4

Messaging queue

Kafka 10

SQS 10

RabbitMQ 6

Data and ML

Python libraries

Numpy 10

Pandas 10

Scikit-learn 8

TensorFlow 8

Matplotlib + Seaborn 6

Big data

SQL 10

Spark (Scala + Pyspark) 6

Athena 6

Others

Excel + VBA 10

Power Query 10

Google Sheets + Scripting 10