General Background The construction of a steel frame warehouse requires a strong foundation system to ensure the stability and safety of the overall building. Specific Background The cold storage warehouse construction project in Cilacap uses a deep foundation in the form of precast piles and pile caps to support the structure on soft soil. Knowledge Gap In-depth evaluation of the stages of piling implementation using Hydraulic Static Pile Driver (HSPD) and testing the integrity of piles in actual soil conditions still requires comprehensive practical documentation. Aims This study aims to provide an overview of the implementation of pile and pile cap work based on field observation methods. Results The results of the observation show that the series of work includes determining the pile point, piling to the depth of the plan, quality testing, and casting of pile cap and tie beam in a monolith. Novelty This study presents the integration of actual field data from HSPD tool records with the analysis of the construction stages of the cold storage warehouse foundation. Implications This finding can be a practical reference in improving the quality of planning and implementation of foundation work in similar construction projects. Key Findings Highlights The piling work using a Hydraulic Static Pile Driver (HSPD) tool with a capacity of 320 tons has proven to be effective in minimizing vibration and noise in soft soil conditions. Quality testing through PDA test and hydraulic pressure dial data recording ensures that the mast carrying capacity has met the planning requirements. The casting of pile caps and tie beams is carried out in a monolith using K-350 concrete quality to ensure an even distribution of structural loads. Keywords Pile Posts, Pile Cap, Steel Frame Shed, Deep Foundation, Observation Method