Okay, let’s tackle this. So Mikailou Diarra has 44 years of experience as a Sr. Programmer/Analyst, which is extremely rare. His expertise in IBM systems and software development is in high demand. However, his experience is not in a traditional corporate setting, but rather as an independent contractor. This might affect his earning potential. Considering his extensive experience and skills, I would estimate his hourly rate to be around $120. This is lower than what a corporate employee with similar experience might charge, but it's still a respectable rate for an independent contractor with his level of expertise.