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API / APIGEE Gateway Interview Questions

What is the Apigee organisation hierarchy and what are Environments?

Apigee uses a clear hierarchical structure to organise all resources. Understanding this hierarchy is essential for managing multi-team and multi-environment API programmes.

Apigee organisational hierarchy
LevelNameDescription
1 (top)OrganisationTop-level container; one per GCP project; holds everything -- proxies, products, developers, environments
2EnvironmentA deployment boundary (e.g. dev, test, prod); proxies must be deployed to an environment to receive traffic; each has its own URL
3API ProxyThe deployable proxy bundle; deployed to one or more environments
3API ProductBusiness package; references environments and proxy resource paths
3Developer / AppExternal developers and their registered applications
# Typical environment setup:
#
# Organisation: my-company
#   |-- Environment: dev      (https://dev.api.example.com)
#   |-- Environment: test     (https://test.api.example.com)
#   |-- Environment: prod     (https://api.example.com)
#
# Proxy deployed to both test and prod:
# gcloud apigee deployments create \
#   --organization=my-company \
#   --environment=prod \
#   --api=orders-proxy \
#   --revision=3

# Environment-specific configuration:
# - Target URLs different per environment (dev points to dev backend)
# - Quotas may differ between test and prod
# - Different SSL certificates per environment
# - KVM (Key Value Maps) scoped per environment for config values

Key point: the Apigee Organisation is NOT the same as the Google Cloud Organisation. It lives inside your GCP project and contains all your environments, APIs, products, and developer registrations. When you deprovision Apigee API hub, it also deletes associated Apigee organisations if they have no Apigee instances.

What must happen before an API proxy can receive traffic in Apigee?
What is the relationship between an Apigee Organisation and a Google Cloud project?

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What is Apigee and what problem does it solve for organisations? What are the deployment models available in Apigee? What is an API proxy in Apigee and what are its main components? What are Flows in Apigee and what is the request/response processing pipeline? What are Apigee Policies and what categories are available? What is the VerifyAPIKey policy and how does basic API key security work in Apigee? How does OAuth 2.0 work in Apigee and what grant types are supported? What is the difference between Quota and SpikeArrest policies in Apigee? What is an API Product in Apigee and how does it differ from an API Proxy? What is the Apigee organisation hierarchy and what are Environments? What are Shared Flows in Apigee and when do you use them? What is response caching in Apigee and how do you configure the ResponseCache policy? What is the AssignMessage policy and what can it do? What is the ExtractVariables policy and how does it work with flow variables? What is the ServiceCallout policy and when would you use it? What are Key Value Maps (KVMs) in Apigee and how do you use them? How does fault handling and error management work in Apigee? What is Target Server configuration in Apigee and why is it used instead of hardcoding backend URLs? What analytics capabilities does Apigee provide? What is the Apigee Developer Portal and how does it support the developer experience? How does JWT validation work in Apigee? What is the MessageLogging policy in Apigee and how is it used for audit and debugging? How does Apigee handle CORS (Cross-Origin Resource Sharing)? What is the Apigee hybrid architecture in more depth, including its components? What are Environment Groups and how does routing work in Apigee? How does TLS and mutual TLS (mTLS) work in Apigee? What is the Access Control policy in Apigee and how do you allowlist/denylist IPs? How do the JSONToXML and XMLToJSON policies work in Apigee? What is GraphQL proxy support in Apigee? What is Apigee CI/CD and how do you deploy proxies in a pipeline? What is RBAC (Role-Based Access Control) in Apigee and what are the built-in roles? What is Advanced API Security in Apigee and how does it detect bot attacks? What is Apigee API Hub and how does it relate to Apigee gateway? How does load balancing and health checking work on Apigee TargetEndpoints? What is the Apigee Debug / Trace tool and how do you use it for troubleshooting? How do you import an OpenAPI specification into Apigee to generate a proxy? What is Apigee monetisation and how does it work? What are Apigee flow variables and how do you work with them? How does Apigee compare to other API gateways such as Kong, AWS API Gateway, and MuleSoft? What are common Apigee anti-patterns and best practices for production deployments?
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