Enterprise Architecture Modernization: From Legacy C/S Systems to Cloud‑Based Real‑Time Platforms

The emergence of cloud platforms together with micro‑services, big data, artificial intelligence and IoT has made "cloudification" the primary characteristic of modern enterprise architecture, prompting organizations to move their systems to public or private clouds.

Many well‑known enterprises still operate information systems built ten years ago on client‑server (C/S) architectures; such legacy systems have long lifecycles and are difficult to replace because of high implementation costs, data migration effort and user‑habit changes.

In the cloud era, the key difference is real‑time operation supported by digital technologies. The article illustrates a typical retail C/S POS workflow—store‑level POS servers record transactions, upload daily data to a backend server, synchronize with ERP, and refresh inventory for the next day—highlighting the latency of day‑level processing.

With the adoption of browser‑based (B/S) POS and the rise of omnichannel retail, POS and e‑commerce back‑ends converge into a cloud‑based "retail middle platform" that provides real‑time cross‑channel data (products, prices, inventory, customer points), shifting processing from a daily to a near‑real‑time model.

Manufacturing adopts a similar layered approach defined by ISA‑95, where ERP, APS, MES and device‑level control operate at decreasing time granularity. Industrial IoT and cloud PaaS create a "manufacturing middle platform" that delivers real‑time data from shop‑floor devices to enterprise applications.

Overall, digital transformation requires a cloud‑native, modular data and digital platform (DDP) supported by DevOps tools; this enables real‑time enterprise management, open ecosystems, and the flexibility needed for future business innovation.