A reporting component receives a large IUserService interface with read, edit, delete, password reset, and role-management methods. How would you improve that boundary?

Interface segregation at application boundaries

Designs consumer-focused contracts that reduce accidental authority and coupling without producing meaningless one-method wrappers.

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The reporting component appears to need user data, not account administration. I would give it a focused query contract such as IUserReportReader that returns the data required for reports. Editing, deletion, password reset, and role management stay on separate boundaries used only by authorized workflows. I would shape the contract around the consumer's use case instead of copying every method from an implementation.

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Consumer-owned interfaces, least authority, query ports, focused contracts, testing, and interface fragmentation trade-offs.

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Large interfaces make consumers depend on operations they do not need. Smaller capability-focused contracts can also reduce the authority available to a component.
The reporting component appears to need user data, not account administration. I would give it a focused query contract such as IUserReportReader that returns the data required for reports. Editing, deletion, password reset, and role management stay on separate boundaries used only by authorized workflows. I would shape the contract around the consumer's use case instead of copying every method from an implementation.
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The focused reader should return a report-oriented model rather than expose persistence entities. That keeps the report independent from user-management internals and makes tests small. I would not create a new interface for every call automatically; consumers with the same cohesive needs can share one contract. The useful split is where capability, ownership, data shape, or change cadence differs, not where a style rule demands another file.

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Copying the large interface into several equally large interfaces.
Returning full user entities to every consumer.
Creating one interface per method without a cohesive capability.
Treating compile-time segregation as runtime authorization.

A reporting component receives a large IUserService interface with read, edit, delete, password reset, and role-management methods. How would you improve that boundary?

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