log4j² yaml¹ multithreading³ terraform¹ jenkins¹ android¹ bash² redis² ruby²⁰ java⁴⁵ xpath¹ aspect oriented programming² service monitoring¹ regular expression¹ webdriver⁴ properties¹ poi² mac³ testng⁶ maven¹ networking⁵ npm¹ linux¹¹ logstash³ xml¹ nagios² jquery¹ mysql⁶ json³ git¹ flask² security¹ robotframework¹ mongodb² spring¹ css⁵ memcached¹ multiprocessing¹ ini¹ service assurance¹ concurrent¹ ansible¹ react¹ elasticsearch² snmp² ssl⁵ html⁵ typescript⁰ nodejs¹¹ socket.io² nosql¹ sqlite¹ vim¹ nginx³ windows⁴ supervisor¹ python³⁹ celery¹ devops⁵ rails⁷ csv¹ ubuntu¹ selenium⁵ gunicorn¹ kibana¹ docker¹ database⁵ virtualization¹ ant³ sql³ algorithm⁷ automation¹⁰ javascript¹⁷