LLM Agent-based Transaction Workflow Automation: Robust Architecture Design for Integrating Legacy Systems and Microservices

Automating complex transaction workflows across legacy systems and microservices is no longer possible without a robust and dynamic architecture. LLM Agents go beyond the limitations of traditional integration methods, dynamically interpreting business logic and integrating systems, dramatically reducing development time and maintenance costs, and opening the door to next-generation automation. This article deeply explores how LLM Agents solve these integration challenges and create business value.

1. The Challenge / Context

Today's enterprise IT environment is evolving into a complex landscape where the stability of legacy systems and the agility of microservices coexist. While core business logic remains tied to decades-old mainframes or sophisticated ERP systems, new customer experiences and innovative services are rapidly being implemented on cloud-based microservice architectures. Connecting these two worlds goes beyond simply linking APIs.

In particular, transaction workflow automation, which requires ensuring data consistency and integrity across multiple systems, has been a persistent challenge. Manual intervention, complex ETL pipelines, sophisticated but rigid BPM (Business Process Management) systems, or screen-based RPA (Robotic Process Automation) struggle to respond quickly to changing business requirements. Situations where even minor business logic changes require redeploying the entire system or manual adjustments are a significant burden for developers and act as a barrier to business expansion for solopreneurs. This rigidity leads to reduced market responsiveness and increased costs, and we now need more intelligent and flexible automation