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Concept for structuring interfaces between components, APIs and user-facing elements, focusing on consistency and integration readiness.
Interface design defines how components, APIs, and user-facing elements expose and organize interactions, contracts, and responsibilities. It sets expectations for usability, consistency and evolution across teams and systems. Well-crafted interfaces reduce integration friction, clarify ownership, and enable maintainability and independent evolution of subsystems.
Measure of average time until a consumer has integrated an interface.
Count of incompatible changes per interface and time period.
Interface availability and rate of integration errors.
An online shop separates product and order APIs, defining clear fields and error codes.
A central design system provides components, tokens and interaction patterns for products.
A façade translates fields and validates data when communicating with an external service.
Identify stakeholders and define goals
Agree on design principles and conventions
Create reference implementation and contract tests
Establish rollout, training and continuous governance