Vitaliy B., I want pay you $20 just to engage in a total of one hour of online chatting with me about database development. You won't have to produce anything. Your profile and the fact that you have 300+ reviews attests to your technical ability and honesty. Prior to beginning our hour at a mutually convenient time (I am in Washington, DC) after I send you a description of the system I am developing. My expertise is finance and financial modeling (Excel), though I have some experience in system design and deployment, it's been mostly front-end design.)
Sound okay to you?