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In this work, a robust, intrinsically self\u2010assembling repeat protein scaffold to enhance ionic conductivity through the selective incorporation of glutamic acids is engineered. These mutations increase the number of available protonation sites and promote the formation of well\u2010defined charge pathways. The self\u2010assembly properties of the system enable the propagation of molecular\u2010level modifications to the macroscopic scale, yielding self\u2010standing protein films with significantly improved ionic conductivity. Specifically, engineered protein\u2010based films exhibit an order of magnitude higher conductivity than their unmodified counterparts, with a further ten\u2010fold enhancement through controlled addition of salt ions. Mechanistic analysis shows that the conductivity enhancement originates from the intertwined contributions of proton transport, hydration, and ion diffusion, all promoted by engineered charged residues. 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