We discuss B-type tensor product branes in mirrors of two-parameter
Calabi–Yau hypersurfaces, using the language of matrix factorizations.
We determine the open string moduli of the branes at the Gepner point.
By turning on both bulk and boundary moduli we then deform the brane
away from the Gepner point. Using the deformation theory of matrix
factorizations we compute Massey products. These contain the information
about higher order deformations and obstructions. The obstructions
are encoded in the F-term equations, which we obtain from the Massey
product algorithm. We show that the F-terms can be integrated to an
effective superpotential. Our results provide an ingredient to open/closed
mirror symmetry for these hypersurfaces.