Abstract

The Architecture for Scalable Microservice Communication in Public Sector Digital Applications (ASMCPA) addresses the growing demand for modular, efficient, and interoperable digital ecosystems that can sustain large-scale citizen services and administrative operations. As governments transition toward digital-first governance, legacy monolithic systems have proven inadequate for managing complex workflows, high transaction volumes, and cross-departmental integration. This research proposes a scalable microservice-based architecture that enhances service modularity, inter-service communication, and real-time data orchestration while ensuring reliability, security, and compliance with public sector standards.The ASMCPA model integrates asynchronous message brokers, API gateways, and service meshes to enable seamless, fault-tolerant communication across distributed components. Through containerization and orchestration technologies such as Docker and Kubernetes, the architecture supports elastic scaling and continuous deployment, facilitating agility in evolving policy or citizen-service requirements. Security and data governance are embedded within each service layer using zero-trust principles, encryption protocols, and audit logging, ensuring alignment with government cybersecurity and privacy frameworks. Furthermore, the architecture introduces observability modules for performance monitoring, resilience testing, and automated fault recovery, thereby improving service continuity and accountability in digital governance infrastructures.By applying this architecture, public sector organizations can achieve improved scalability, reduced system downtime, and enhanced interoperability between ministries, agencies, and external partners. The paper also explores practical applications in e-governance, digital health, taxation systems, and smart city platforms, highlighting the model’s adaptability to diverse administrative contexts. Ultimately, ASMCPA contributes to the digital transformation and modernization of public services, promoting transparency, inclusivity, and efficiency. It positions microservice communication as a core enabler of data-driven, citizen-centric governance, fostering a new era of resilient and responsive digital infrastructures that align with sustainable and equitable development goals.