E · Services · Development & Engineering
API Development
Designing and building REST or GraphQL APIs, or working against third-party APIs. Good deliverables include an OpenAPI or schema document, authentication and error handling that are specified rather than improvised, and tests that cover rate limits and failure cases.
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Buyer guide
- Ask for the API specification to be agreed before implementation starts.
- Provide third-party API keys through your own secrets manager or environment settings, not by message.
What to compare
- 01REST vs GraphQL
- 02Authentication method
- 03OpenAPI or schema documentation
- 04Versioning and error handling
- 05Rate-limit and retry handling
Use cases
- Exposing lead or order data to partners
- Syncing data between internal tools
FAQ
What documentation should come with a custom API?
At minimum a machine-readable specification such as OpenAPI or a GraphQL schema, authentication instructions, error codes and example requests. Check that it is in the deliverables list.