Should I manage APIs differently across cloud and on-prem?

Yes — usually you should manage APIs a bit differently across cloud and on-prem, but keep the same core API governance wherever possible.

What should stay the same

Across both environments, try to keep:

• API standards: naming, versioning, error formats, auth patterns
• Security policies: OAuth/OIDC, mTLS where needed, least privilege
• Lifecycle management: design, review, publish, deprecate, retire
• Documentation and discovery: consistent portal, contracts, OpenAPI specs
• Monitoring/SLAs: latency, error rates, availability, usage analytics

This avoids creating two different API cultures.

What often differs

Cloud APIs

Cloud usually favors:

• Centralized API gateway / management platform
• Autoscaling and elastic throttling
• Public exposure patterns for external partners/customers
• Managed services integration (identity, observability, WAF, CDN)
• Higher automation via CI/CD and policy-as-code

On-prem APIs

On-prem often needs:

• Stricter network segmentation
• More manual capacity planning
• Legacy system integration
• Different identity/federation constraints
• Local deployment controls and sometimes slower release cycles

Practical approach

A good model is:

1. Use one API governance framework
2. Allow environment-specific implementation
3. Standardize the developer experience
4. Adapt infrastructure controls to the environment

Example:

• Cloud: API gateway + managed auth + auto-scaling
• On-prem: gateway or ingress controller + internal IAM + fixed capacity and tighter network rules

Key question to decide

Ask:

• Are these APIs internal only or customer/partner facing?
• Do they need uniform policy enforcement across environments?
• Are there regulatory/data residency constraints?
• Is the on-prem estate tied to legacy apps that can’t follow cloud patterns?

Recommendation

If you have both cloud and on-prem, aim for:

• One API strategy
• Two deployment patterns
• One set of standards

That gives you consistency without ignoring the realities of each environment.

If you want, I can also give you a cloud-vs-on-prem API management checklist or a reference architecture.