POWER OF ATTORNEY
                        FOR SECTION 16 REPORTING PURPOSES

     Know all by these presents, that the undersigned hereby constitutes and
appoints each of Jeff Mengoli, Chuck Cassidy and Justin Bowes, or any of them
signing singly, and with full power of substitution, as the undersigned's true
and lawful attorney-in-fact to:

     (1)     prepare and execute for and on behalf of the undersigned Forms 3, 4
             and 5 in accordance with Section 16(a) of the Securities Exchange
             Act of 1934 and the rules thereunder, and any other forms or
             reports the undersigned may be required to file in connection with
             the undersigned's ownership, acquisition or disposition of
             securities of BigCommerce Holdings, Inc. (the "Company");

     (2)     do and perform any and all acts for and on behalf of the
             undersigned that may be necessary or desirable to complete and
             execute any such Form 3, 4 or 5, or other form or report, and
             timely file such form or report with the United States Securities
             and Exchange Commission and any stock exchange or similar
             authority; and

     (3)     take any other action of any type whatsoever in connection with the
             foregoing that, 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 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 attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming, nor
is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

     This Power of Attorney shall remain in full force and effect until the
undersigned is no longerrequired to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed asof this 13th day of July, 2020.


                                        /s/ Lisa Pearson
                                --------------------------------
                                Name:   Lisa Pearson