Electrodeposition is a widely used method to synthesise coatings for number of applications in a less expensive and effective way with respect to physical vapour deposition (PVD) and chemical vapour deposition (CVD). Compositionally modulated multilayer (CMM) Co-Sn coating were successfully deposited with the help of electrodeposition on a copper substrate. Typically Co-Sn based coatings are toxicity free and popular alternatives for lead (Pb) and chromium (Cr) based coatings from an improved environmental perspective. Coating microstructure was found to be homogeneous, nanostructured in nature with smooth and distinct interfaces as confirmed by SEM and TEM investigation. In this study, micro-mechanical properties of the CMM Co-Sn coatings were investigated using in-situ micro-pillar compression within the HELIOS Dual Beam FIB system. Micro-mechanical properties of electrodeposited monolithic sole Co and sole Sn coatings were also investigated for comparison purposes. CMM Co-Sn coating shows high flow strength of approximately 330 MPa, which is of the order of 1.2 and 5 times higher than that of sole Co and sole Sn coating, respectively. Such enhanced mechanical properties are the result of intermixing of several thin Co-Sn layers to form a single broad layer to accommodate deformation as a result external loading and to minimize system’s energy as evident by detail scanning transmission electron microscopy (STEM) investigation on deformed micro-pillars.