First measurable performance parameters would have to be decided. E.g. Mistakes/Rejections, Promptness, Throughput, Attitude etc. Based on them, the incentive can be calculated.
Relevant Skills and Experience
I have done the same for Customer Support agents supporting over 50 customers online. I hold an engineering Masters degree in Computer Science with 15 years of IT experience
Proposed Milestones
₹2000 INR - Draft design
₹1000 INR - Final design
₹4000 INR - First solution
₹1000 INR - Corrected final solution
Additional Services Offered
₹2000 INR - Suggest enhancement ideas
₹1000 INR - Estimate effort for enhancement ideas