Architecture

Question 1

Design an architecture that supports real-time ingestion, high-volume writes, scalability, reliability, and data consistency.

Answer 1

Core Architecture Components

1. Integration Layer
   External System → API (Web API / Custom API)
   Message Queue (Azure Service Bus / Kafka) to buffer spikes
   Decouples producers from CRM
2. Processing Layer
   Azure Functions / Logic Apps
   Transform, validate, deduplicate
   Idempotency + concurrency control
   Batch aggregation for efficiency
3. Dynamics 365 Write Layer

Bulk operations (ExecuteMultiple / Batch API)
Async operations for non-critical tasks
Retry logic (exponential backoff, circuit breaker)

4. Scalability
   Auto-scaling Functions
   Throttling + respecting D365 API limits
   Data partitioning to reduce contention
5. Consistency & Monitoring
   Eventual consistency
   App Insights / Log Analytics
   Dead Letter Queue (DLQ) for failed records
6. Security
   OAuth2 / API keys
   HTTPS + Key Vault
   Compliance (GDPR/HIPAA)