Application Design Patterns

Question 1

In application design, what is the ambassador pattern?

Answer 1

Ambassador Pattern (App Design):

Used to offload everyday tasks (e.g., logging, security, retries) from a client to a helper service (the ambassador) that sits beside the client. This is useful when interacting with external or legacy services.

Example:
A microservice uses an ambassador to add retry logic before calling an external payment API.

Question 2

In application design, what is the anti-corruption layer

Answer 2

Anti-Corruption Layer (ACL)

in application design is a protective layer that isolates your system from external or legacy systems to avoid unwanted dependencies or “corruption” from their models. It translates data and behavior between systems, preserving your domain integrity.

Example:
A modern e-commerce app uses an ACL to interact with a legacy ERP system, translating its outdated product data model into the app’s clean, consistent format.

Question 3

in application design, what is an asynchronous request-reply

Answer 3

An asynchronous request-reply is a communication pattern where the sender sends a request and continues without waiting for an immediate response. The reply comes later, often via a callback, message queue, or polling. This improves scalability and responsiveness.

Example: A web app sends an image to an API for processing. It immediately returns control to the user, and the result is delivered later via email or a status endpoint.

Question 4

In the application design, what are the backends for the frontend pattern?

Answer 4

Backends for Frontend (BFF)** is a design pattern where each frontend (e.g., web, mobile) has a dedicated backend tailored to its needs. It helps simplify frontend development by aggregating and shaping data from multiple services.

Example:
A mobile app BFF fetches user data and images from different microservices, formats them efficiently for mobile display, and returns a compact response.

Key Benefit:
Decouples frontend from complex backend logic, improving performance and maintainability.

Question 5

In application design, what is the Bulkhead Pattern?

Answer 5

Backends for Frontend (BFF)** is a design pattern where each frontend (e.g., web, mobile) has a dedicated backend tailored to its needs. It helps simplify frontend development by aggregating and shaping data from multiple services.

Example:
A mobile app BFF fetches user data and images from different microservices, formats them efficiently for mobile display, and returns a compact response.

Key Benefit:
Decouples frontend from complex backend logic, improving performance and maintainability.

Question 6

Ai application design: what’s caching aside?

Answer 6

Caching** in AI application design means storing frequently used data in a temporary storage (cache) to reduce repeated computation or slow database access, improving performance and response times.

Example:
An AI chatbot caches user profile data after the first lookup to avoid hitting the database on every message.

Question 7

Ai application design what’s Choreography?

Answer 7

Choreography in AI application design refers to a decentralized coordination pattern where each service or component reacts to events independently without a central controller.

🔹 Key idea: Services listen for and emit events, enabling flexible, loosely coupled interactions.

📘 Example: In an AI workflow, the “Image Uploaded” event triggers an “Image Classifier” service, which emits a “Classification Done” event that a “Report Generator” listens to — no central orchestrator required.

Question 8

In application design was a circuit breaker?

Question 9

an application design what’s the calm check

Question 10

can I please design what’s the compensating transaction

Question 11

in application design was completing consumers

Question 12

an application designed with compute resource consolidation

Question 13

an application design what cors

Question 14

an application is designed what’s deployment stamps

Question 15

in application design what’s it work looked configuration

Question 16

the application design was event sourcing

Question 17

an application design what’s external configuration store

Question 18

in application design what’s the GateKeeper

Question 19

in the application design what’s the Gateway aggregation

Question 20

an application design was to Gateway offloading

Question 21

in application design once Gateway routing

Question 22

an application designed was geode

Question 23

an application design was held to endpoint monitoring

Question 24

an application design what’s an index table

Question 25

in application design What leader election

Question 26

an application design what's materialized view

Question 27

application design what message Bridge

Question 28

an application designed with pipes and filters

Question 29

in applications designed what's a priority queue

Question 30

In application design, what's publish-subscribe

Question 31

In application design, what's quarantine

Question 32

an application design once query-based load leveling

Question 33

Application design was rate-limiting

Question 34

In application design was Retry

Question 35

In application design was The Saga pattern

Question 36

In the application designed with a scheduler agent supervisor

Question 37

In application design was the sequential Convoy

Question 38

An application designed with sharding

Question 39

In application designed with Sidecar

Question 40

In application design, what static content hosting

Question 41

In application design was Strangler fig

Question 42

In application, the design was throttling

Question 43

in application design, what's a valid key