We are seeking a highly experienced **Senior Process Engineer** with strong expertise in water, wastewater, and biosolids treatment. The role involves designing and optimising treatment processes, facilitating HAZOP studies, and supporting delivery of large-scale infrastructure project in Riyadh. **Key Responsibilities** + Lead process design for water and wastewater treatment plants (PFDs, P&IDs, mass balances, specifications). + Deliver projects to agreed cost, quality, and schedule targets. + Conduct HAZOP/SWIFT workshops and risk assessments. + Support commissioning and optimisation of treatment facilities (AD, AAD, THP, liquor treatment, biogas). + Collaborate with clients, contractors, and supply chain partners. + Mentor and guide junior engineers. **Qualifications & Experience** + Bachelor’s in Chemical Engineering; Master’s preferred. + Chartered Engineer (CEng, IChemE or equivalent). + 15+ years in water/wastewater and biosolids engineering. + Proven expertise in anaerobic digestion, THP, liquor treatment, and biosolids optimisation. + Strong project management and leadership skills. **Skills** + Process optimisation & troubleshooting. + Technical documentation & modelling. + Risk assessment & compliance. + Strong client-facing and communication skills **Imagine a better future for you and a better future for us all.** Join our close-knit community of talented individuals who share your passion for making a positive impact. Our global team includes more than 69,000 employees, working together to make a difference in communities both close to home and around the world. **With us, you can.** **Apply today.**