POWER OF ATTORNEY

       Know all by these presents, that the undersigned hereby constitutes and appoints each of Christy Lillquist,

Mark Tanoury, John McKenna and Seth Gottlieb, signing individually, the undersigned's true and lawful attorneys-in

fact and agents to:

       (1) execute for and on behalf of the undersigned, in the undersigned's capacity as an

officer, director or beneficial owner of more than 10% of a registered class of securities of Roku,

Inc. (the "Company"), Forms 3, 4 and 5 (including any amendments thereto) in accordance with

Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and the

rules thereunder and a Form ID, Uniform Application for Access Codes to File on EDGAR;

       (2) do and perform any and all acts for and on behalf of the undersigned that may be

necessary or desirable to execute such Forms 3, 4 or 5 or Form ID (including any amendments

thereto) and timely file such forms with the United States Securities and Exchange Commission

and any stock exchange or similar authority; and

       (3) take any other action of any nature whatsoever in connection with the foregoing

which, in the opinion of such attorney-in-fact, may be of benefit, in the best interest of, or legally

required by, the undersigned, it being understood that the documents executed by such attorney-

in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and

shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-

fact's discretion.

       The undersigned hereby grants to each such attorney-in-fact full power and authority to do and

perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise

of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned

might or could do if personally present, with full power of substitution or revocation, hereby ratifying and

confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully

do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The

undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request

of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's

responsibilities to comply with Section 16 of the Exchange Act.

       This Power of Attorney shall remain in full force and effect until the earliest to occur of (a) the

undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of

and transactions in securities issued by the Company, (b) revocation by the undersigned in a signed

writing delivered to the foregoing attorneys-in-fact or (c) as to any attorney-in-fact individually, until

such attorney-in-fact is no longer employed by the Company or Cooley LLP.

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of

March 29, 2019.



/s/ Stephen H. Kay

Stephen H. Kay









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