AECOM is the world's largest architectural and engineering design firm, providing professional infrastructure consulting, planning, design, construction management, and investment services to governments, businesses, and organizations globally. The company operates on a fee-based model, primarily billing employees' time on client projects across three segments: Americas, International, and AECOM Capital (real estate development). It serves major infrastructure markets including transportation, facilities, water, environmental and energy sectors, with roughly balanced revenue from government and private clients worldwide, earning revenue through cost-reimbursable contracts, guaranteed maximum price arrangements, and fixed-price engagements that collectively span the project lifecycle from advisory through delivery.