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This paper will discuss about slope reinforcement by using geosynthetics of HDPE Uniaxial Geogrid. The slope reinforcement shall be used in order to optimize land use of a residential houses at South Tangerang, Indonesia. Right in front of the slope, there is a river bank which flood during rainy seasons. To optimize the land use as residential areas, the surface elevation must be above the flood water level, hence a 15 meters of embankment need to be constructed. To reach the embankment design height, a HDPE Uniaxial Geogrid material (geosynthetics) was chosen as reinforcement material to stabilize the slope. A geotechnical software, ReSSA (Reinforced and Unreinforced Slope Stability Analysis) 3.0, were used for slope stability analysis. The available fill material at site was red soil which is a cohesive soil type. Therefore, it requires a good drainage system so the developed pore water pressure can be dissipated through the drainage layer. A uniform grade of crushed stones (granular) was used as drainage layer. The combination of granular material and cohesive soils on geogrids has shown good stability in reinforcing the slope.