Civil engineering has traditionally defined urban infrastructure through physical assets, technical standards, structural performance, and service delivery. Yet infrastructure cannot remain resilient or sustainable when planning, design, construction, operation, and maintenance are disconnected from the knowledge and capacities of the communities they serve. This keynote proposes community intelligence as a component of infrastructure systems, complementing physical, ecological, digital, and institutional engineering. It is conceptualized through five capacities: local spatial knowledge, collective agency, negotiation capacity, institutional connectivity, and collective learning. Drawing on community-based infrastructure initiatives in Surabaya, Indonesia, the presentation examines climate-responsive public facilities, neighbourhood upgrading, drainage and flood-risk reduction, ecological infrastructure, public space, heritage adaptation, and early-warning systems. The cases demonstrate how community knowledge improves risk identification, infrastructure siting, functional design, operational suitability, maintenance, and adaptation under environmental conditions. Communities therefore contribute not only as beneficiaries or consultees, but as infrastructure actors who help sustain performance throughout the asset life cycle. However, unequal authority, technical literacy, and institutional access may limit these contributions. Civil engineering excellence requires participatory governance, accessible technical knowledge, interdisciplinary collaboration, and post-construction learning. For Southeast Asian cities, community intelligence provides a context-sensitive pathway for converting infrastructure investments into durable, adaptive, inclusive, and collectively maintained urban systems.