Build and maintain detailed cash flow models incorporating production forecasts, capital and operating costs, commodity pricing, transportation and marketing assumptions, taxes, royalties, production sharing terms, cost recovery mechanisms, profit oil/gas splits, carried interests, and other applicable fiscal and contractual terms. Develop and maintain integrated economic models incorporating subsurface, operational, commercial, fiscal, contractual, and financing assumptions, including production sharing agreements, concessions, royalties, taxes, and other complex international structures.