Professional Service on a "Retainership" Basis
If you are rendering professional service on a "Retainership" basis, you do not come under the definition of an "Employee" as per the EPF & ESI Act. To be considered a professional, you need to have qualifications/expertise in fields such as Law, Engineering, CA, ICWA, ACS, etc. If you are planning to provide professional services, the service receiver will determine your categorization as a Professional or a Part-Time Employee.
Please note that Part-Time Employees fall under the purview of all labor laws applicable to employees. If you are still in the planning phase, you cannot determine the applicability of PF/ESI as a service provider. The applicability of various laws must be determined by your employer following the due procedure. Based on the information provided, I conclude that you fall under IT & ST.