A financial services company is building a new microservices-based application to handle real-time fraud detection. They need to ensure that individual services can be updated and deployed independently without causing system-wide failures, and that the failure of one service doesn’t cascade to others. Which of the following design patterns would be the most appropriate primary mechanism to achieve this core requirement?

You are reviewing the architecture for a global e-commerce platform. The team has implemented a pattern where a central component, the ‘orchestrator,’ is responsible for sequencing and coordinating the execution of multiple, discrete business process steps across various services. This was done to maintain explicit control over the process flow. Which pattern best describes this approach?

During a post-mortem analysis of a system outage, your team identifies that a core inventory service failed due to a sudden, massive spike in requests from a new batch reporting job. The service became unresponsive, which then caused timeouts and failures in the dependent order processing and shopping cart services. What pattern, had it been in place, would have most effectively prevented this type of cascading failure?

Consider a scenario where a legacy monolithic application exposes a large, complex API for customer data. A new mobile application team only needs a small, simplified subset of this data, formatted specifically for mobile use. They cannot modify the legacy system. Which pattern would allow them to create a tailored, consumer-specific interface without impacting the legacy service?

Your organization mandates that all service communication must be logged for compliance and auditing purposes. However, developers are concerned that adding logging logic directly into each service’s business code will make it bloated, tangled, and hard to maintain. Which pattern provides a clean way to add this kind of cross-cutting concern to services?

A composite service you’ve designed aggregates data from three other downstream services to build a consolidated customer profile. A requirement states that if one of the three downstream services is unavailable, the composite service should still return a partial profile with data from the available services, along with a note indicating what data is missing, rather than failing completely. Which reliability pattern is essential to meeting this requirement?

In a distributed booking system, the ‘make reservation’ process involves calling a payment service and an inventory service. If the inventory update fails after the payment has been taken, the system needs to automatically refund the payment to ensure data consistency and avoid charging for a failed booking. Which pattern formalizes this kind of corrective logic?

To improve performance and availability, your team has deployed multiple, identical instances of a critical product catalog service behind a load balancer. However, a client application has logic that needs to maintain a session with a specific service instance for the duration of its interaction. Which pattern helps manage this by ensuring a client’s requests are directed to the same service instance?

You are designing a service for processing high-volume sensor data from IoT devices. The data arrives in bursts, and the processing service can sometimes fall behind, leading to lost messages. You need a mechanism to decouple the data producers (devices) from the consumer (processing service) to handle these variable loads reliably. Which pattern is the foundational solution for this kind of decoupling?

A financial services company is building a new microservices-based application to handle real-time fraud detection. They need to ensure that individual services can be updated and deployed independently without causing system-wide failures, and that the failure of one service doesn’t cascade to others. Which of the following design patterns would be the most appropriate primary mechanism to achieve this core requirement?0