From high school to PhD and after graduation, all his focus and work have revolved entirely around computer science and digital technology. This dedicated path has allowed him to acquire specialized knowledge and invaluable experience in various areas. These include proficient analysis, design, and utilization of Artificial Intelligence, a deep understanding of cybersecurity, particularly in the area of multimedia ownership authentication and privacy, and collaborative teamwork to develop cutting-edge algorithms in Machine Learning, NLP, and more. Consequently, Sajjad has made notable contributions and significant impacts in the fields of cybersecurity and AI through the creation and advancement of innovative algorithms. These accomplishments have been recognized through publications in top-tier blind peer-reviewed journals and conferences.

In the past, he has worked as a research assistant at Nanjing University of Science and Technology, as well as a lecturer at IAU University. Currently, he holds the position of lecturer in computing at the University of the West of Scotland.

In addition to his academic roles, Sajjad actively contributes to the digital community through teaching and conducting research. He organizes workshops, serves as an editor and reviewer for scholarly publications, and consistently strives to share his knowledge and assist others in enhancing their skills within related fields and industries. His research interests encompass a range of topics, including Multimedia forensics, Multimedia Security, Information Hiding, Image/Audio/Video Signal Processing, Pattern Recognition, and Machine Learning.