Designing systems and web applications (MVC, Microservices, REST/GraphQL) for almost 10 years ago. Python (Django/Flask/Celery), Node (ExpressJs/NestJs), databases (MySQL, Postgres, on RDS, and NoSQL like a Firestore, DynamoDB or MongoDB), virtualization (Vagrant, Docker, EC2, ECS, Fargate), CI/CD (Gitlab-CI, Github Actions, Travis-CI)...