For web-site and API devolopment: Django, Docker, AWS, Grafana, Kibana, Nginx, Jenkins, CSS, HTM, Twillo.
For mobile application development: React, REST, Firebase, Markup
For trading engine development: Docker, AWS, Grafana, Spring, Jenkins, Twillo, Nginx, REST, CSS, HTML, React, RabbitMQ, Spring Data JDBC, JMeter, ELK, API