Assistant teacher at Harinavi D.V.A.S. High school, south 24 parganas from 02.08.1983.
Assistant professor at Krishnath College,   Berhampur, Murshidabad 18.07.1988.Â
Selection Grade Lecturer at this college from 01.04.2000.
1. A theoretical estimate of relative contribution of refractivity towards group delay- A. K. Sen, P. K. Karmakar, T. K. Das, M. Rahaman and S. Devbarman. Indian Journal of Radio and Space Physics Vol. 20,. pp- 26-28, Feb, 1991.
 2. Tropospheric extinction brightness temperature and excess path length in relation to communication radar and radio-astronomical studies. A. K. Sen, P. K. Karmakar, M. Rahaman, K. S. Zand and M. K. Sengupta - Indian Journal of Radio and Space Physics,  vol. 20, pp. 79-81, April, 1991.
3. Observation of microwave radio Sun during total Solar ecppse on October 24, 1995 by Eastern Centre for Research in Astrophysics (ECRA), T. N. Chatterjee, S. K. Dutta, Ajay Kumar Dutta, S. Chatterjee, G. Tarafdar, J. Bera, M. Rahaman, R. Bera, A. Mitra, P. K. Karmakar, M. K. Sengupta, N. Purkait, A. K. Sen, T. K. Das, C. K. Majumdar and B. Lokanadhan. Indian Journal of Physics Vol. 70B (3), pp. 169-173, (1996).
4. Measurement of atmospheric water vapour content over a tropical location by dual frequency microwave radiometry; P. K. Karmakar, M. Rahaman & A. K. Sen, Int. J. Remote Sensing (U. K.), Vol. 22. No : 17, pp : 3309-3322, 2001.
5.Estimation of absorption and hence electrical path length at 22.235 GHz; P. K. Karmakar, M. Rahaman, S. Chattopadhyay and A. K. Sen - Indian J. Radio & Space Physics, Vol. 30, pp : 36-42, Feb. 2001
6. Effect of water vapour and pquid water on Microwave absorption spectra and its apppcation; Karmakar, P.K, M.Maiti, S.Chattopadhyay and M. Rahaman- Radio Science Bulletin, No. 303, p : 32-36, December 2002.
Conference:
7. Tropospheric effects in Radio Astronomical observations at Microwaves and Milpmeter Waves by A. K. Sen, M. Rahaman, S. Chattopadhyay, A. K. Dutta and P. K. Karmakar, in International Conf. on Astrophys and Cosmology at S.I.N.P., Calcutta, 1993.
8.      “Water vapour measurement at Calcutta by Dual frequency Radiometry”. P. K. Karmakar, M. Rahaman, S. Chattopadhyay, A. Mitra, A. K. Sen and N. C. Majumdar, - X1 - National Space Science Symposium (NSSS-2K), at Toshep Sander, Konarak, Marine Drive, Puri- 752002,  1-4 March, 2000.
9. “Studies of water vapour during prerain and post rain period by dual frequency radiometers”, A. K. Sen, M. Rahaman, A. Mitra, P. K. Karmakar and C. K. Chatterjee.   X1 - National Space Science Symposium (NSSS-2K) at Toshep Sander, Konarak Marine Drive, Puri- 752002, 1-4 March, 2000.
Dr. Rahaman was the only full-time teacher in his department upto 2019. Besides his basic duties of theoretical and practical class teaching, he is involved in:
1. He acted as Head of the Deartment since joining this college in 2000.
2. Preparation of theoretical and practical lesson plan for 1st yr, 2nd yr & 3rd year classes (Honours and General).
3. Setting of question papers and evaluation of answer scripts of internal examinations and University examinations.
4. Framing of weekly class routine for the department.
5. Assembly and maintenance of laboratory instruments which are required for accuracy of experiments and the results.
6. Maintainence of all computers belonging to the department as well as the computers of other departments.
7. He acted as an External examiner in the University practical examinations.
8. He acted as C.U Examination question setter as well as question moderator.
9. He also acted as head examier for C.U Examination.
And moderator of the University Examination.
1. Dr. Rahaman was a member of the College Governing body during the period 2010.- 2014
2. He was also member of different sub-committees of the college.
3. Member and convener of Admission sub-committee.
4. Member and convener of computer maintenance sub-committee.
5. Member and convener of laboratory Development sub-Committee.
6. Member of IQAC During (2018-2019)
7. Member of Building Sub-committee.
8. Member and convener of college web site design Sub-committee.
9. Member of Distance education sub-committee. (during 2014-2015)