Enterprise API Integration & Custom Middleware Architecture
Architecting unified data ecosystems—not just connecting applications.
Moonello designs and builds custom middleware architectures that sit between your systems and enforce structure, reliability, and governance. This is not a plugin or a point-to-point API connection. It is an engineered integration layer that controls how data is transformed, validated, synchronized, and secured across your organization. The result is predictable data flow between systems that were never designed to communicate.
High-fidelity data synchronization across disparately structured systems.
Enterprise systems do not fail because APIs are unavailable; they fail because data models do not align. We engineer middleware that performs schema mapping, data normalization, and transformation logic at the integration layer. This ensures that records originating in one system retain semantic accuracy as they move through others. The outcome is reduced data drift, fewer reconciliation errors, and operational reporting that reflects reality instead of assumptions.
Bridging legacy infrastructure with modern cloud environments.
Moonello specializes in integrating on-premise systems—SQL databases, proprietary ERPs, and mainframe-backed workflows—with cloud-native platforms such as AWS, Azure, and SaaS applications. We design hybrid architectures that respect legacy constraints while enabling modern capabilities like real-time synchronization, event-driven processing, and API-based extensibility. This allows organizations to modernize incrementally without disrupting core operations.
An architectural approach built for scale, security, and control.
Our middleware architectures are designed with explicit access boundaries, authentication strategies, and failure handling. APIs are versioned. Data contracts are enforced. Latency and throughput are measured, not assumed. This reduces integration risk, limits blast radius when systems change, and creates a foundation that scales as transaction volume and system complexity increase.
The business outcome: operational continuity without system rewrites.
By introducing a dedicated integration layer, Moonello eliminates brittle point-to-point connections and manual workarounds. CIOs gain system-level visibility and control. Operations teams gain reliable data synchronization. Leadership gains confidence that new tools can be added without destabilizing existing infrastructure. This is how legacy environments evolve into integrated, future-ready ecosystems—without a forced rip-and-replace.
The Cost of Disconnected Systems
Without a unified integration layer, organizations pay a recurring fragmentation tax in the form of delayed decisions, inaccurate data, and growing operational drag with data silos and operational friction. This is the problem Moonello is engineered to eliminate.
Fragmentation Creates Decision Latency
Disconnected systems convert real-time operations into delayed intelligence. When data lives across isolated ERPs, CRMs, and operational tools, executives operate on T-minus-24-hour information instead of T-minus-1-second signals. This lag compounds across forecasting, inventory planning, and customer operations. The cost is not visibility alone—it is slower decisions made with incomplete context, increasing downstream risk with every reporting cycle.
Legacy Platforms Enforce Structural Bottlenecks
Many legacy systems were designed before API-first architecture became standard. They rely on batch exports, flat files, or proprietary interfaces rather than real-time endpoints. This forces organizations to compensate with manual workarounds, brittle scripts, or point-to-point integrations that do not scale. The result is unscalable administrative overhead that grows linearly with system count and transaction volume.
The Measurable Cost of Manual Synchronization
Manual data re-entry introduces compounding error. Industry benchmarks show error rates approaching ~1% per keystroke, which escalates rapidly across high-volume operational workflows. Synchronization delays reduce inventory turnover velocity, distort demand signals, and inflate reconciliation costs. Every hour of lag between systems represents lost operational precision—and every workaround increases long-term integration debt.
Disconnected systems do not just slow teams down—they institutionalize inefficiency.
Our Architecture: Event-Driven Middleware & Microservices
Moonello engineers middleware as a dedicated integration layer that governs how systems communicate. We replace brittle point-to-point connections with a hub-and-spoke or message-bus architecture that centralizes transformation logic, validation, and routing. Each system integrates once—into the middleware—not repeatedly into every other system. This reduces coupling, limits failure propagation, and makes future integrations additive rather than disruptive.
Enterprise environments rarely share a common communication standard. Our middleware is protocol agnostic by design. We ingest SOAP and XML payloads from legacy platforms and translate them into JSON and REST interfaces consumed by modern cloud applications. This translation layer preserves data semantics while enabling real-time interoperability without requiring changes to legacy systems.
Moonello architectures are event-driven. Data moves when a business event occurs—a sale is completed, an account is updated, a user logs in—not when a nightly batch job runs. Events are published, processed, and propagated in near real time, reducing synchronization lag and eliminating stale state across systems. This model improves operational responsiveness while maintaining deterministic control over data flow.
Within the middleware layer, we design internal microservices to communicate over gRPC to minimize latency and maximize throughput. For frontend and consumer-facing applications, we expose GraphQL APIs that allow precise data querying without over-fetching. This separation optimizes performance at every layer of the system while maintaining a single source of truth for business logic.
The result is an integration architecture engineered for change.
Systems evolve, vendors change, and volumes grow. By combining event-driven middleware, protocol translation, and microservices-based communication, Moonello builds integration layers that scale operationally, adapt structurally, and remain stable under continuous change.
A Central Integration Layer, Not Point-to-Point Dependencies
Protocol-Agnostic Translation Between Old and New
Event-Driven Data Flow Instead of Batch Dependency
Microservices Communication Optimized for Performance and Scale
Deterministic Data Transformation and Normalization (ETL)
Moonello engineers transformation pipelines that normalize inconsistent legacy data into cloud-ready formats. This includes type coercion, schema alignment, and temporal normalization—such as converting a MM/DD/YYYY string stored in a legacy SQL system into an ISO 8601 timestamp object consumed by modern cloud services. These transformations are enforced at the middleware layer, ensuring downstream systems operate on structurally consistent, semantically reliable data.
Fault Tolerance Through Queuing and Redundancy
Our architectures assume failure and are designed to absorb it. When a downstream system is unavailable, events are routed to Dead Letter Queues (DLQs) rather than dropped or retried indefinitely. This preserves data integrity, prevents cascading failures, and enables controlled reprocessing once the system recovers. The result is a self-healing integration ecosystem that maintains operational continuity under partial outages.
Rate Limiting and Throttling for System Protection
High-throughput integrations can overwhelm backend systems if left ungoverned. Moonello implements rate limiting and throttling policies at the API and middleware layers to regulate request volume and burst behavior. This protects legacy platforms from overload, enforces contractual API limits, and ensures predictable performance during traffic spikes without manual intervention.
End-to-End Observability and Traceability
We instrument integration layers with structured logging, metrics, and distributed tracing using standards such as OpenTelemetry. Every request can be traced across services, queues, and transformations with measurable latency and error context. This provides engineering teams with immediate visibility into system behavior and gives leadership confidence that failures are diagnosable, auditable, and correctable.
These capabilities convert integration from a liability into infrastructure.
Throughput is controlled. Data is transformed deterministically. Failures are contained and observable. This is how Moonello delivers integration architectures that support stable operations at enterprise scale.
Modernizing the Legacy Enterprise
Each use case follows the same architectural principle.
Preserve what works. Isolate what does not scale. Introduce a controlled integration layer that enables modernization without forcing system replacement.
- The ERP Bridge — Bi-Directional System Synchronization
Moonello architects bi-directional synchronization between on-premise ERPs such as Sage or SAP and modern CRMs like Salesforce or HubSpot. Inventory, pricing, and customer records are propagated as events, not batch exports. Updates flow in both directions with conflict resolution and schema enforcement at the middleware layer.
Outcome: Sales teams operate with real-time inventory visibility inside the CRM, eliminating overpromising and reducing manual reconciliation.
- E-Commerce Orchestration — Real-Time Inventory Control
We design event-driven orchestration layers that coordinate inventory across Shopify, Amazon, and internal warehouse systems. Each purchase triggers an immediate inventory decrementation event that propagates to all channels simultaneously. This prevents race conditions between marketplaces and ensures consistent stock state across every sales surface.
Outcome: Zero oversold inventory caused by synchronization lag, even during high-volume traffic events.
- Legacy Exposure — Secure API Enablement for Aging Systems
Moonello wraps legacy SQL databases—often 20 years old or more—inside secure, authenticated RESTful APIs. Business logic and access control are enforced at the middleware layer, not inside the legacy system. This allows modern mobile and web applications to read and write data without direct database access or schema modification.
Outcome: Legacy systems become safely consumable by modern applications without destabilizing core infrastructure.
The Zero-Trust Approach to Security & Compliance
Standards-Based Authentication and Authorization
Moonello enforces modern identity standards across every integration. All access is governed by OAuth 2.0 and OpenID Connect, with short-lived tokens and scoped permissions. Credentials are never hardcoded into applications or scripts. This ensures that every request is authenticated, authorized, and attributable to a defined identity.
Encryption by Default, Not by Exception
All data transmitted through the middleware is encrypted using TLS 1.3 to prevent interception or downgrade attacks. Data persisted within the integration layer is encrypted at rest using AES-256. Encryption policies are enforced at the architectural level, not left to individual service implementations, ensuring consistent protection across all data flows.
API Gateway as a Controlled Access Boundary
Every request enters the system through a centralized API Gateway. This gateway validates authentication tokens, enforces rate limits, inspects payloads, and rejects malformed or unauthorized traffic before it reaches core systems. The result is a singular, auditable control point that prevents integration layers from becoming an unmonitored attack surface.
Compliance-Ready Logging and Data Handling
Moonello designs integration architectures with compliance requirements built in. Detailed access logs, request traces, and data-handling records are maintained to support SOC 2 audits and GDPR obligations. Sensitive data movement is traceable, retention policies are enforceable, and audit evidence is generated as a byproduct of normal system operation.
The outcome is controlled connectivity without exposed risk.
Zero-trust principles ensure that integration expands capability without creating backdoors. Systems communicate securely, access is verifiable, and compliance is engineered into the architecture from the first request.
The Architecture Discovery Audit
- Diagnose the System Before You Change It
Moonello begins with an Architecture Discovery Audit designed to map your current data topography. We analyze how information moves between systems, where silos form, and where manual intervention compensates for missing integration. This phase replaces assumptions with a concrete understanding of system boundaries, dependencies, and failure points.
- A Technical Roadmap You Can Execute Against
The outcome is a structured roadmap document that defines the proposed middleware architecture in practical terms. It outlines integration endpoints, data transformation logic, security and authentication protocols, and event flow patterns. This document is implementation-ready—whether executed by Moonello or used internally—providing a clear, defensible path forward.
- This is a low-risk entry point with high strategic value.
Before committing to a build, you gain architectural clarity, cost visibility, and risk reduction.
Request an Integration Roadmap
What Our Clients Have Said About Us
From medium to large sized companies, our focus remains the same.
Moonello has been a great partner to SGS! They have helped us grow and scale our business over the last 7 years. Moonello's knowledge of Software and IT is invaluable to SGS. If you are looking for a team to help grow your business, look no further!
Moonello's expertise is evident as they have a process-oriented approach to your goals, which help turn your goals into a tangible action plan. Their team clearly has extensive experience in this realm and that shows with the questions and ideas generated. They dive into the details with you to get to the core of your needs rather than apply an easy solution that may solve some surface issues. To me, this tells me they care that you succeed because then they will succeed.
Moonello is far beyond just a developer or marketing company. They’re a business partner that consistently uses their skills and expertise to help your company grow…. I highly recommend Moonello if you’re looking to develop new technology or set up your digital marketing plan. They’re truly a fantastic team that has been critical in our development as a company!
The Moonello team was able to take the vision we had for our company application and make it so much more than we ever imagined. It has the functionality we wanted and it has even more style, energy, fun, and attitude than we were hoping to convey to the public. Moonello has been responsive to our needs and wants, which has made the process better than I expected.
Moonello has been a great partner to SGS! They have helped us grow and scale our business over the last 7 years. Moonello's knowledge of Software and IT is invaluable to SGS. If you are looking for a team to help grow your business, look no further!
Moonello's expertise is evident as they have a process-oriented approach to your goals, which help turn your goals into a tangible action plan. Their team clearly has extensive experience in this realm and that shows with the questions and ideas generated. They dive into the details with you to get to the core of your needs rather than apply an easy solution that may solve some surface issues. To me, this tells me they care that you succeed because then they will succeed.
Moonello is far beyond just a developer or marketing company. They’re a business partner that consistently uses their skills and expertise to help your company grow…. I highly recommend Moonello if you’re looking to develop new technology or set up your digital marketing plan. They’re truly a fantastic team that has been critical in our development as a company!
The Moonello team was able to take the vision we had for our company application and make it so much more than we ever imagined. It has the functionality we wanted and it has even more style, energy, fun, and attitude than we were hoping to convey to the public. Moonello has been responsive to our needs and wants, which has made the process better than I expected.