in the testing phase, developers conduct various tests to ensure that the web application works as intended. web applications developers can connect web applications to payment gateways, social media platforms, and third-party services to enhance their functionality. they are typically built using a combination of programming languages, such as html, css, and javascript. crafters harbour sp. z o.o. swietego jana 11/4 40-012 katowice polska nip: 6343053453