Work over 3 years as the developer , and here are below the tech stacks which I am expert in: 

Django/Flask and other web frameworks Style of the Restful API, the separation of the front and back end Front-end 

HTML,CSS,JavaScript, Bootstrap, Jquery, Ajax, Three.js, Vue,React,etc 

MySQL/Oracle/other relational databases and non-relational databases such as Redis/SQLite 

Linux (centos, Ubuntu, etc), Windows Server and other operating systems 

Networking protocols, including TCP/IP, UDP, DNS, DHCP, FTP,SFTP,SSH and so on, and the tools like ping , nslookup, telnet ,wget, scp and so on 

Containerization technology, like Vmware,Docker,K8S, CI/CD, GitLab,Harbor,Jenkins,Ansible tools, etc 

Some of the web server, like nginx，IIS，UWSGI and so on 

Programming stylls of the multiple-processing、multiple-threading Code version management tool, Git and private code-warehouse,GitLab and so on 

Programming language like C#,python(just like module of the Socket，Selenium，PyQt5, WxPython，Numpy，CX_Oracle and so on ) 

Monitor tools, like Zabbix,Promethus, Grafana,AlertManager 

Cloud Management of AWS , AliCloud,TencentCloud