Ask client for testomonial

[#1]

Can I ask directly client for testimonial in Upwork message after completed my job?

[#2]

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Amit K wrote:

Can I ask directly client for testimonial in Upwork message after completed my job?

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You "can" but it's generally considered poor form.

Personally, I've never mentioned feedback to a client and never would, I just encourage clients to end the contract, that way you get feedback automatically without having to ask for it.