Dr. Mohammad Hajarian is a Marie Curie Postdoctoral Fellow and Assistant Professor at Universidad Carlos III de Madrid, where he leads the EU-funded ROSNUB project. He is also the CEO and Founder of Gegli (Gohardasht), one of the pioneering social networks he launched in 2003. With over 50 publications, including articles and books, Dr. Hajarian has made significant contributions across disciplines such as Online Social Networks, Gamification, Human-Computer Interaction, Interaction Design, Recommendation Systems, Personalization, User Engagement, Data Science, and User Acquisition. His research currently focuses on developing methods to fight misinformation and mitigate online hostility within social networks. He has taught over 35 courses and supervised numerous graduate and postgraduate theses. His innovative work has been widely adopted in the social media and software industry. He collaborates with fellow researchers through his social network platform to implement and validate cutting-edge methods in real-world environments. He has also participated in several industrial software projects and actively collaborates on various Horizon Europe and industry-driven projects. He frequently serves as a reviewer and editor for leading scientific journals and conferences. He also speaks and presents papers, workshops, and tutorials at major conferences and universities. In recognition of his contributions, Dr. Hajarian has received several prestigious awards and honors.
Python, C++, C, ASP, VB.net, C#.net, PHP, HTML 5, CSS, JavaScript, JAVA, SQL, VB 6.0, R, jQuery, jQuery mobile, PhoneGap, Bootstrap, Scrappy, TensorFlow, Ajax, WCF, web services. Full stack developing web applications, mobile applications and windows applications, front end, backend, designing, programming, data science, data mining, Hybrid programming, multi-platform programming, cross platform programming.
Microsoft SQL server development and administration, MySQL server development and administration, PostgreSQL, Oracle.
Network administrating, Server administrating, Designing network security and network infrastructure, ISA server, Exchange server, DHCP server, DNS server, IIS Server, VPN (routing and remote server), Active directory, Cloud computing, Windows server (2020 -2003), Windows clients, Virtualization, VMware, Microsoft Hyper-V, Xampp
Microsoft Visual Studio, Microsoft Office (Word, Excel, Access, PowerPoint, Outlook), Microsoft Visio, Microsoft Project, Microsoft Business Intelligence, RapidMiner, Weka, Gephi, NodeXL, LaTeX, SPSS, MATLAB, Adobe Photoshop, Adobe Premiere, Adobe Dreamweaver, Adobe Illustrator, Camtasia Studio, Microsoft SQL Server, Aptana Studio, Corel, NetSupport, EndNote, Fiddler, Android Studio, Balsamiq, JetBrains, PyCharm, Eclipse, Unity, Blender, Jupyter, TensorFlow, PyTorch, Pandas, WordPress, Joomla, Firebase, OpenVPN, Slack.
ROSNUB (Project ID: 2018/00578/037) is a Marie Sklodowska-Curie Actions (MSCA) COFUND CONEX-Plus Project ( PI: Mohammad Hajarian). Reputation Metrics and Methods for Gamifying and Regulating Online Social Network Users’ Behaviors (ROSNUB) Project aim to address the problems online social media can cause in today’s human life. Nowadays, in online social networks, users are exposed to fake news, misinformation, online hostility, and misogyny talks generated by other users. In this situation, users might have less regulated emotions, accept extreme behaviors, and misperceive each other. These problems can start from social media and affect people’s mental and physical health in real life. Study results show that more than half of young social network users have experienced cyber aggression resulting in emotions such as depression, suicide, and embarrassment in their life. Incel movement is an excellent example of transforming hostility from online social networks to the real world. To tackle the mentioned problems, social media users’ behavior should be regulated. While legal solutions might help, they are not encouraging, and current social media ecosystems have been built on a foundation that encourages users to engage in such activities to gain more attention or, in other words, likes. Although a good number of studies have been conducted on these mentioned problems in social networks, all are about detecting such problems, and software engineering approaches for preventing them have not been investigated. This is very important because prevention is always a better solution than detection. As a result, this project investigates algorithms and frameworks to regulate social network users’ behavior joyfully in a personalized way and from the software engineering perspective to increase citizens’ mental and physical health and wellbeing. URL: Conex Plus Project page
A research-based Social Network. Gegli, formerly known as Gohardasht.com, is among the world's first social networks. It has been my lifelong project since 2003. It has around half a million members, and new users join daily. Includes communities, blogging services, groups, chat rooms, p2p chat, and many other features. This website and mobile application contain millions of lines of code that I wrote in ASP, JavaScript, SQL, and other programming languages and frameworks. URL: Gegli.com
I have participated in developing a gamified mobile version of UC3M PACE project as a member of University Carlos III de Madrid DEI interactive systems group. URL: PACE Project
Mobile application for Gegli Social Network. I wrote it with PhoneGap, CSS, and JavaScript and developed web services for the backend. URL: Gegli on Google play
A research-based crawler software to collect and analyze social data. I wrote this program with python, ASP, SQL, JavaScript, HTML, and bootstrap. I have written a book and a 134-page research report about this project. URL: Crawler screenshots
A research-based project exchange social network, including a website and mobile application for ordering and exchanging projects between freelancers. I wrote this program in JAVA, PostgreSQL was used as a database. I have translated a book and wrote a 581-page report about this product. URL: Persia Project screenshots
Advertisement website in persian. URL: Ketabezard.com
Social blogging service. baxblog.com
A windows application which included 3 programs I wrote: Hobby, HIP, and Fast - Published on a CD drive. One Screenshots
My e-commerce website for selling digital products, software development, providing advertising, text messaging solutions under the web, Domain registration, Web hosting, Advising companies and individuals for their software systems. URL: MainSystem.com
A windows application to play Dots and Boxes game with computer.
A windows application which calculates high school GPA.
A windows application to help guitar players to play new songs in Persian.
Hajarian, M., Carrillo, M.H., Díaz, P. et al. Gamispotify: a gamified social music recommendation system based on users’ personal values. Multimed Tools Appl (2025). (Q1, Scopus, Web of Science) https://doi.org/10.1007/s11042-024-20588-y
Hajarian, M., Diaz, P., & Aedo, I. (2024). Overgamified? An Exploratory Study on Gamification and Crowdsourcing for Fake Accounts Detection in Social Networks. International Journal of Human-Computer Interaction, 1–27. (Q1, Scopus, Web of Science) https://doi.org/10.1080/10447318.2024.2427989.
Hajarian, M., Camilleri, M. A., Díaz, P., & Aedo, I. (2021). A taxonomy of online marketing methods. In Strategic corporate communication in the digital age. Emerald Publishing Limited. ISBN: 978-1-80071-265-2, eISBN: 978-1-80071-264-5 https://doi.org/10.1108/978-1-80071-264-520211014
Hajarian, M., Bastanfard, A., Mohammadzadeh, J., & Khalilian, M. (2019). SNEFL: Social Network Explicit Fuzzy Like Dataset and its Application for Incel Detection. Multimedia Tools and Applications, 1380-7501. https://doi.org/10.1007/s11042-019-08057-3. ISI, IF:2.3 - Scopus Q1.
Hajarian, M., Bastanfard, A., Mohammadzadeh, J., & Khalilian, M. (2019). A personalized gamification method for increasing user engagement in social networks. Social Network Analysis and Mining, 9(1), 47. https://doi.org/10.1007/s13278-019-0589-3 ISI- Scopus Q1.
Hajarian, M., Bastanfard, A., Mohammadzadeh, J., & Khalilian, M. (2017). Introducing fuzzy like in social networks and its effects on advertising profits and human behavior. Computers in Human Behavior, 77, 282-293. https://doi.org/10.1016/j.chb.2017.08.046. ISI, IF:5.1 - Scopus Q1.
Hajarian, M. (2015). A Framework for Improving Web 2.0 Interaction Design. Ciência e Natura, 37, 156-161. http://dx.doi.org/10.5902/2179460X20785 ISI – Open Access.
Hajarian, M. (2015). Improving user satisfaction of websites using data mining. GALAXY International Interdisciplinary Research Journal ISSN 2347-6915 GIIRJ. 3 (5), 171-176. https://doi.org/10.6084/m9.figshare.13668464
Hajarian, M. (2015). Why people use social networks? International journal of social science & interdisciplinary research ISSN 2277-3630, vol. 4 (6), June (2015), pp. 177-182. https://doi.org/10.6084/m9.figshare.13668479
Hajarian, M. (2015). The role of data mining in revenue of websites. Galaxy international interdisciplinary research journal ISSN 2347-6915. 3 (5), 177-181. https://doi.org/10.6084/m9.figshare.13668488
Hajarian, M. (2015). Toward the development of cross-platform mobile applications. Galaxy international interdisciplinary research journal ISSN 2347-6915. 3 (5), 182-185. https://doi.org/10.6084/m9.figshare.13668494
Hajarian, M. (2015). Applying Data mining for advertisement in social networks and improving CTR. J. Appl. Environ. Biol. Sci, 5(12S), 417-420. http://dx.doi.org/10.6084/m9.figshare.13668638 Open Access.
Hajarian, M. & Bastanfard, A. An Image Enhancement Framework for Low Vision Users of Social Networks (2017). 2nd Conference on Technology in Electrical and Computer Engineering (TEC-2017). https://en.civilica.com/doc/744579/
Hajarian, M. & Khalilian, M. A (2016). Framework for Improving Movement Detection by Implementing Data Mining on Big Data of Internet of Things. 3d International Congress on Computer, Electrical, and Communication. https://en.civilica.com/doc/576256/
Hajarian, M. & Nikravanshalmani, A. (2016). Improving Quality management in Developing Mobile Applications. 3d International Congress on Computer, Electrical, and Communication. https://en.civilica.com/doc/576257/
Hajarian, M. (2015). Applying Data mining for advertisement in social networks and improving CTR. International Conference on Research in Engineering, Science and Technology 21 July 2015 Istanbul. 1 (1), 465. https://en.civilica.com/doc/398715/
Hajarian, M. (2015). A Framework for Improving Web 2.0 Interaction Design. International Conference in New Research of Electronic Engineering and Computer science. https://en.civilica.com/doc/404422/
Seyed Mojtaba Haji Amini & Hajarian, M. (2019). مروری بر بلاک چین، تکنولوژی هویت و سرویس تایید هویت . Second National Conference on New Technologies in Electrical and Computer Engineering. Isfahan. https://en.civilica.com/doc/859417
Bahar Zarei Kashantoui & Hajarian, M. (2019). مروری بر تجزیه و تحلیل مه داده های چند رسانه ای . Second National Conference on New Technologies in Electrical and Computer Engineering. Isfahan. https://en.civilica.com/doc/859416
Seyed Mojtaba Haji Amini & Hajarian, M. (2019). یک سیستم مدیریت داده توزیع شده برای پشتیبانی از تحلیل دادههای بزرگ مقیاس . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923894
Ali Zamani, Mehdi Jiriaei Sharahi & Hajarian, M. (2019). جرم شناسی رایانه ای شبکه با استفاده از سیستم شناسایی ترافیک مخرب در حملات تزریق اس کیو ال . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923887
Zahra Akhoondi & Hajarian, M. (2019). استخراج قطب معنایی مثبت و منفی عبارات کلیدی در رسانه های اجتماعی . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/924002
Zahra Khan Babalu & Hajarian, M. (2019). تجزیه و تحلیل نظرات برای مقایسه برنامه های تلفن همراه . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923893
Eileen Heydarian & Hajarian, M. (2019). کشف حساب سیبیل (Sybil) در توییتر . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923942
Arman Rahmani & Hajarian, M. (2019). سیستم فایل توزیع یافته برای شبکه توری بیسیم ابری :MeshFS. Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/924004
Mona Vahidian & Hajarian, M. (2019). مروری بر خلاصه سازی چندرسانه ای با استفاده از محتوای رسانه اجتماعی . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran.
Mehdi Beizaininejad & Hajarian, M. (2019). مروری بر انعطاف پذیری تحمل خرابی و حفظ حریم خصوصی محتوا در شبکه حسگر بیسیم . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923889
Zeynab mirzaaghanejad & Hajarian, M. (2019). استخراج مبتنی بر عبارت شکایت های کاربران در گزارش های برنامه موبایل . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran.
Narjes Gholami & Hajarian, M. (2019). استفاده از web usage mining برای بهبود طراحی وبسایت های تجارت الکترونیکی . Sixth National Congress on Electrical Engineering and Computer Engineering of Iran with a New Approach to New Energy. Tehran. https://en.civilica.com/doc/923996
Kaveh Norouzi & Hajarian, M. (2019). احراز هویت کاربر در پروژه های تحت وب با استفاده از اپلیکیشن ورود . National Congress of Basic Research in Computer Engineering and Information Technology. Tehran. https://en.civilica.com/doc/924584
Mehdi ghasemi & Hajarian, M. (2019).مروری بر اهمیت قابلیت اطمینان در سیستم های توزیع شده . National Congress of Basic Research in Computer Engineering and Information Technology. Tehran.
Faezeh Nazari, Maryam Saleh & Hajarian, M. (2019). مروری بر طبقه بندی موضوعات توییتر با استفاده از تجزیه و تحلیل شبکه های اجتماعی . National Congress of Basic Research in Computer Engineering and Information Technology. Tehran. https://en.civilica.com/doc/924587
Kaveh Norouzi, Sohrab Hosseini & Hajarian, M. (2019). محاسبه کلان داده های چند رسانه ای و برنامه های کاربردی اینترنت چیزها: یک طبقه بندی و مدل فرایند . National Congress of Basic Research in Computer Engineering and Information Technology. Tehran. https://en.civilica.com/doc/924585
Hajarian, M., Azam Bastanfard, Javad Mohammadzadeh & Majid Khalilian (2019). الگوریتم فازی لایک صریح برای شبکه های اجتماعی . The 6th International Congress on Development and Promotion of Fundamental Science and Technology in Society. Tehran. https://en.civilica.com/doc/916767
Bahar Zarei Kashantoui & Hajarian, M. (2019). مروری بر تاثیر شبکه های اجتماعی و جذب توریست دررشد اقتصادی . 6th National Conference on Applied Research in Computer Engineering and Information Technology. Tehran. https://en.civilica.com/doc/1011701
Seyed Mojtaba Haji Amini & Hajarian, M. (2019). هوش بینایی ماشین برای بررسی نقص محصول مبتنی بر یادگیری عمیق و تبدیل هوف . 6th National Conference on Applied Research in Computer Engineering and Information Technology. Tehran. https://en.civilica.com/doc/1011632
Farnaz Hosseini Eghbal, Ramin Ahmadi, Anaram Yaghoubi Notash, Hajarian, M & Gholamhossein Ekbatanifard. (2016). مروری بر مقالات مسیریابی مبتنی بر خوشه بندی و کارآمد از نظر انرژی در شبک های حسگر بیسیم . 3rd International Conference on Applied Researchers in Computer and Information Technology. Tehran. https://en.civilica.com/doc/466891/
Gamification in social network engineering (2019). Melerd publications. Iran. ISBN: 978-600-491-214-3
Collecting data from social networks: methods and applications (2019). Melerd publications. Iran. ISBN: 978-600-491-213-6
A self-study book on C++ programming (2019). Melerd publications. Iran. ISBN: 978-600-491-215-0
Designing Cross platform mobile application using Xamarin (2019). Melerd publications. Iran. ISBN: 978-600-491-211-2
Social network engineering in web 2.0 (2018). Melerd publications. Iran. ISBN: 978-600-491-047-7
Developing mobile applications with android studio (2018). Melerd publications. Iran. ISBN:978-600-491-023-1
A self-study book on Visual basic programming (2018). Melerd publications. Iran. ISBN: 978-600-491-022-4
Data structures and algorithms with JavaScript (2017). Melerd publications. Iran. ISBN: 978-600-491-021-7
C# in one day. Self-published (2017). Iran. ISBN: 978-600-04-9005-8
Training professional mobile application programming using phone gap and jQuery mobile (2015). Sarafraz publications. Iran. ISBN: 978 - 600 - 328 - 213 - 1
High-performance browser networking (2019), Melerd publications. Iran. ISBN: 978-600-491-209- 9