We supported Ashghal in the design, tender and construction of the Doha North Wastewater Program, serving a population exceeding 150,000. The project included 35 km of deep interceptor sewers, a main pumping station, a 244,000 m³/day advanced treatment plant with thermal drying, and a treated effluent reuse system for irrigation. We reviewed design drawings, assisted in tender evaluation and led construction oversight, ensuring quality, safety and timely delivery across all four packages. Lessons learned included applying constructability-focused design, clarifying technical specifications, and managing material limitations in the local market. These measures reduced cost variations, avoided disputes, and maximized client satisfaction while achieving a state-of-the-art wastewater treatment and reuse system for northern Doha.