Russian Ancestry Birth-Date Research

I want to pinpoint the exact birth and death dates of my Russian great-grandparents and, in the process, gain a clearer picture of their early lives. I have no family papers, certificates, or photographs... (Budget: ₹750 - ₹1250 INR, Jobs: Data Analysis, English (US) Translator, Genealogy, Research, Russian Translator, Transcription, Translation)