POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints
Ryan Spencer, Kelly MacDonald, John Slebir, Justin Burgess, Trevor Dutcher and
Ron Metzger or any of them signing singly, with full power of substitution, the
undersigned's true and lawful attorney in fact to:

(1) prepare, execute in the undersigned's name and on the undersigned's behalf,
and submit to the U.S. Securities and Exchange Commission (the SEC) a Form ID
Application to Obtain EDGAR Access Codes and any other forms necessary to
generate EDGAR codes on my behalf enabling the undersigned to make electronic
filings with the SEC of reports required by Section 16(a) of the Securities
Exchange Act of 1934 or any rule or regulation of the SEC;

(2) execute for and on behalf of the undersigned, in the undersigned's capacity
as a director, officer and/or a 10% stockholder of Dynavax Technologies
Corporation (the Company), Forms 3, 4, and 5 in accordance with Section 16(a) of
the Securities Exchange Act of 1934 and the rules thereunder;

(3) do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such Form 3, 4, or 5,
complete and execute any amendment or amendments thereto, and timely file such
form with the SEC and any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney in fact, may be of benefit to,
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 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.

This Power of Attorney shall remain in full force and effect until either 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
or unless earlier revoked by the undersigned in a signed writing delivered to
the foregoing attorneys in fact.

The undersigned has caused this Power of Attorney to be executed as of this 28th
day of July, 2021.


/s/ Robert Janssen
Signature

Robert Janssen
Print Name