This study explores the fabrication and electrochemical performance of flexible NiCo₂O₄-based pseudo-capacitor electrodes, inkjet-printed onto flexible Kapton substrates. To circumvent the insulating nature of Kapton, a thin Au interlayer (20 nm) was introduced, significantly enhancing electrical conductivity. The effect of NiCo₂O₄ mass loading, ranging from 0.1 to 0.5 mg cm⁻², was investigated. Optimal performance was achieved at a loading of 0.3 mg cm⁻² on Au/Kapton substrates, yielding a specific capacitance of 520 F g⁻¹ at 3.3 A g⁻¹ and 90% capacitance retention after 1000 charge–discharge cycles. These results confirm that inkjet-printed NiCo₂O₄ electrodes, when combined with a conductive interlayer, exhibit excellent pseudo-capacitive behavior on flexible, non-conductive substrates. This approach demonstrates the feasibility of scalable, low-temperature fabrication techniques for high-performance flexible energy storage devices, suitable for emerging wearable technologies.