Architecting Modular Microservices Using Asynchronous Messaging and REST APIs in Multi-Tenant Software-as-a-Service Platforms

• Author(s): Eseoghene Daniel Erigha ; Ehimah Obuse ; Babawale Patrick Okare ; Abel Chukwuemeke Uzoka ; Samuel Owoade; Noah Ayanbode
• Paper ID: 1710019
• Page: 319-336
• Published Date: 31-10-2019
• Published In: Iconic Research And Engineering Journals
• Publisher: IRE Journals
• e-ISSN: 2456-8880
• Volume/Issue: Volume 3 Issue 4 October-2019

Abstract

The evolution of cloud computing and the increasing demand for scalable, flexible, and tenant-aware applications have driven the widespread adoption of microservices in Software-as-a-Service (SaaS) platforms. This explores the architectural principles and design patterns involved in building modular microservices using asynchronous messaging and REST APIs within multi-tenant SaaS environments. Microservices promote modularity and independent deployment, while multi-tenancy enables resource sharing across customers with logical separation. However, achieving scalability, resilience, and tenant isolation in such systems requires careful architectural decisions. REST APIs serve as the backbone for synchronous communication between clients and services, offering a standardized interface for interaction, versioning, and access control. In contrast, asynchronous messaging—enabled by technologies such as Apache Kafka, RabbitMQ, and AWS SNS/SQS—facilitates loose coupling, fault tolerance, and eventual consistency across distributed microservices. This discusses the use of publish-subscribe, message queues, and event-driven designs to orchestrate and choreograph services, especially in scenarios requiring scalability and temporal decoupling. A critical focus is given to multi-tenant design patterns, including database isolation strategies, tenant-aware authentication, and context propagation across services. Operational aspects such as containerized deployment, observability, CI/CD pipelines, and dynamic scaling are explored to demonstrate real-world viability. Security and compliance are also examined, with emphasis on data segregation, encryption, and monitoring. By integrating RESTful APIs for command and query responsibilities with asynchronous messaging for event propagation and background processing, SaaS platforms can achieve high availability, responsiveness, and modular growth. This hybrid approach supports agile development and continuous delivery in a competitive SaaS landscape. This concludes by identifying open research directions such as serverless microservices, cross-tenant analytics, and AI-enhanced service orchestration. Overall, this provides a comprehensive framework for architecting next-generation SaaS platforms that are robust, tenant-aware, and operationally efficient.

Keywords

Architecting, Modular microservices, Asynchronous messaging, REST APIs, Multi-tenant, Software-as-a-service platforms

Citations

IRE Journals:
Eseoghene Daniel Erigha , Ehimah Obuse , Babawale Patrick Okare , Abel Chukwuemeke Uzoka , Samuel Owoade; Noah Ayanbode "Architecting Modular Microservices Using Asynchronous Messaging and REST APIs in Multi-Tenant Software-as-a-Service Platforms" Iconic Research And Engineering Journals Volume 3 Issue 4 2019 Page 319-336

IEEE:
Eseoghene Daniel Erigha , Ehimah Obuse , Babawale Patrick Okare , Abel Chukwuemeke Uzoka , Samuel Owoade; Noah Ayanbode "Architecting Modular Microservices Using Asynchronous Messaging and REST APIs in Multi-Tenant Software-as-a-Service Platforms" Iconic Research And Engineering Journals, 3(4)