The present invention is directed, in part, to a system and methods for human resources management and efficient, online and mobile guidance on assisting job seekers in locating and securing job opportunities. More specifically, the present invention relates to a system and methods for performing substitute fulfillment, including identifying acceptable substitute employees/professionals, job opportunity review, real time employee availability, skill set review for employers/clients, appointment scheduling and establishing network connections amongst employers/clients and employees/professionals for both current and future job opportunities. Even more specifically, the present invention relates to building experience hours through successive work experience, establishing network connections and securing employment through historical connections among subscriber users and in optimizing staffing to accommodate for peak and non-peak business hours. Further, the present invention provides methods and a system for optimizing scheduling for available employment shifts through geolocation and internet sources.