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Technical expert
Based on the provided information, it appears that the caller is likely to be from a technical background, possibly an engineer, and the purpose of the call is related to a service. The mention of an "engineer" suggests that the call may be related to a maintenance or repair issue. Given the context, it is reasonable to assume that the caller is reaching out to discuss a specific problem or request assistance. Further analysis of the caller's comments and behaviour would be necessary to determine the exact nature of the call.
Technical expert