12^th International Conference on Internet Engineering & Web Services (InWeS 2021) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of Internet Engineering & Web services environment. Current information age is witnessing a dramatic use of digital and electronic devices in the workplace and beyond. Internet Engineering & Web services present a rather arduous requirement of robustness, reliability and availability to the end user. Internet Engineering & Web services has received a significant and sustained research interest in terms of designing and deploying large scale and high performance computational applications in real life. The aim of the conference is to provide a platform to the researchers and practitioners from both academia as well as industry to meet and share cutting-edge development in the field.