System integration: connect ERP, CRM, e-commerce and legacy systems without friction

Systems integration is the discipline of connecting software that was never designed to talk to each other — ERP, CRM, e-commerce, marketplaces, WMS, marketing platforms and legacy systems — so that business-critical data (order, inventory, price, customer, tax invoice) moves between them in real time and stays consistent. In practice it is the invisible layer where most digital projects live or die: a good-looking storefront that doesn't sync inventory with the ERP, or a CRM that never receives orders, delivers a poor experience no matter how solid everything else is.

There are three broad integration models. Point-to-point (one system talks directly to another) — simple, but it becomes a tangle that is hard to maintain as the number of systems grows. Middleware/iPaaS (a central layer orchestrates the exchanges) — governable and reusable, suited to meshes with many systems. And event-driven — asynchronous, resilient and auditable, suited to high volume. CCX Company designs and implements all three, choosing the right one for the scenario instead of forcing a silver bullet.

Planning an integration project starts by mapping the systems, the master data and the business events, defining the source of truth for each piece of data (who owns inventory? who owns price?), and designing versioned API contracts. CCX treats integration as an engineering project — with idempotency, retry, Dead Letter Queue, reconciliation and observability — not as a fragile script that breaks on the first change.

Integration between ERP and e-commerce is the most common and the most critical scenario in Brazilian digital retail. Orders that never reach the ERP, stale inventory that sells products you don't have, prices that diverge across channels, NF-e that fails to issue — all are symptoms of the same cause: poorly architected integration. CCX integrates the main ERPs on the market (SAP S/4HANA, TOTVS Protheus, Bling, Tiny, Oracle) with the main e-commerce platforms (VTEX, Shopify, Salesforce Commerce) and with marketplaces, covering order, inventory, price, customer, tax and logistics.

The pattern that prevents overselling combines near-real-time inventory sync with periodic reconciliation: every movement emits an idempotent event, and a reconciliation job corrects any divergence. For Brazilian tax documents (NF-e, NFC-e, CT-e), the integration has to respect the rules of each state and the correct issuing sequence. CCX has delivered more than 200 enterprise integrations and treats every connector with automated tests and monitoring — so the operations team doesn't learn about a problem from a customer complaint.

Event-driven architecture integrates systems through asynchronous messages instead of tightly coupled synchronous calls. Rather than having the e-commerce wait for the ERP to answer (and stall when the ERP is slow), the storefront publishes an 'order created' event and moves on; ERP, WMS and CRM consume that event at their own pace. Three gains follow: resilience (one system going down doesn't take the others with it), scale (multiple consumers in parallel) and auditability (the event log is the source of truth).

The technical pillars are idempotency (processing the same event twice doesn't duplicate the effect), retry with exponential backoff (trying again without overloading anything), Dead Letter Queue (isolating problem messages without blocking the queue) and event versioning (evolving the contract without breaking consumers). CCX implements event-driven integration on Kafka and RabbitMQ, with the Outbox pattern to guarantee that no event is lost between the database and the broker — the same engineering that runs CCX's own platforms, CCX Messages and NexLog OS.

MuleSoft Anypoint is the iPaaS (integration Platform as a Service) CCX uses for API-led architectures: instead of point-to-point integrations that turn into spaghetti, you build reusable APIs in layers (system, process, experience) with centralized governance, security and observability. The question isn't 'is MuleSoft good?' — it's 'how many integrations do you have, and how much reuse and governance do you need?'.

For a handful of stable integrations, dedicated connectors are cheaper and simpler. For dozens of systems, several teams consuming the same APIs and a real need for governance (who accesses what, under which rate limit, with which SLA), an iPaaS such as MuleSoft pays for itself quickly — because each new integration reuses existing APIs instead of starting from scratch. CCX makes that assessment honestly: we implement MuleSoft when it is justified and dedicated connectors when it isn't — without pushing a license you don't need.

CCX runs integration projects in phases: discovery (map of systems, master data, events and source of truth), architecture (integration model — events, iPaaS or connectors; versioned API contracts), build (implementation with automated tests and isolated environments), go-live (cutover with a parallel-run window and a rollback plan) and ongoing support (monitoring, reconciliation and evolution). Every connector is born with idempotency, retry, DLQ and observability — not patched in afterwards.

The difference a well-built integration makes shows up in what doesn't happen: inventory doesn't oversell, orders don't disappear, tax issuing doesn't stall, and the business can launch a new channel or marketplace by reusing the existing mesh instead of rebuilding everything. CCX takes responsibility for data consistency across systems, with fortnightly governance and integration health reports.

The cost of an integration project varies with three factors: how many systems have to be connected, the volume of events and transactions, and criticality (tax and financial flows demand more rigor). One-off integrations — a single ERP to a single e-commerce, for example — start in the tens of thousands of reais (BRL). Enterprise integration meshes, with multiple systems, marketplaces, API governance and an SLA, fall into the scope of a multi-year project with a dedicated squad.

CCX runs a free assessment of your integration landscape and delivers a TCO broken down by phase, so you can compare the cost of building and maintaining the integration against the cost — often larger and invisible — of operating with disconnected systems: manual rework, inventory errors, lost sales and hours of reconciliation. Request the assessment and receive an integration roadmap with priorities and realistic estimates.