Calculator for app development cost estimation highlighting the critical role of IoT Security Specialists in Singapore, the UK, and France for Smart City Infrastructure Management applications (e.g., managing public transport, utilities, public safety systems). Securing vast networks of IoT devices in a smart city context is paramount. IoT security experts in technologically advanced SG, London (UK), and Paris (FR) are essential. The primary cost drivers related to security include end-to-end threat modeling for the entire IoT ecosystem, secure device provisioning and authentication, data encryption in transit and at rest (from sensors to cloud), secure firmware updates, intrusion detection and prevention systems for IoT networks, and compliance with data privacy regulations. The calculator will factor in the costs of penetration testing of IoT devices and networks, developing secure APIs for accessing IoT data, and implementing robust access control mechanisms for different user roles (e.g., city operators, maintenance crews). Ensuring the resilience of smart city services against cyberattacks is a major focus. Ongoing costs are significant, involving continuous security monitoring, vulnerability management, incident response, and adapting security measures to evolving threats and new IoT technologies.