In the LHC long shutdown 3, due to start in mid-2026, the LHC will be upgraded to the High-Luminosity LHC. To address the challenges for operation at the HL-LHC, such as an increased interaction rate and higher radiation levels, an upgrade of the tracking system of the CMS detector is being built. The new CMS Outer Tracker will feature silicon-based detector modules with on-module track-stub selection based on transverse momentum. At NISER, India, efforts focus on assembling 2S modules with two silicon strip sensors and about four thousand readout channels. Each module integrates radiation-hard ASICs, high-speed optical transmitters, and DCDC converters. After assembly, every module undergoes thorough electronic noise characterisation at +20  \(^\circ \) C and −35  \(^\circ \) C. Once characterised, modules are integrated into larger structures called ladders, where additional readout tests and temperature cycling validate durability before shipment to CERN. This multi-stage assembly process follows stringent quality control measures and relies on state-of-the-art machinery, including precision glue dispensers, optical metrology, and ultrasonic wire bonders. These efforts are evidence of NISER’s strong commitment to the success of the HL-LHC project.