The service designed for customers to engage with certified cloud professionals for project-specific assistance like architecture optimization or security assessments is AWS IQ. This platform connects users with third-party experts on demand, which suits the needs of the tech company described in the question. In contrast, AWS Activate is aimed at providing startups with resources such as credit towards services, not direct expert consultancy. AWS Managed Services offers full management of AWS environments for enterprise-scale operations, not individual project guidance. Lastly, the AWS Support plan provides general support and troubleshooting for AWS products and services, rather than specialized project help.