<PAGE>

                                                                    EXHIBIT 31.2

                                  CERTIFICATION

I, Julianne M. Biagini, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Endwave Corporation;

2.    Based on my knowledge, this report does not contain any untrue statement
      of a material fact or omit to 2 state a material fact necessary to make
      the statements made, in light of the circumstances under which such
      statements were made, not misleading with respect to the period covered by
      this report;

3.    Based on my knowledge, the financial statements, and other financial
      information included in this 3 report, fairly present in all material
      respects the financial condition, results of operations and cash flows of
      the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officers and I are responsible for
      establishing and maintaining 4 disclosure controls and procedures (as
      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant
      and have:

      (a)   designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, to ensure that material information relating to the
            registrant, including its consolidated subsidiaries, is made known
            to us by others within those entities, particularly during the
            period in which this report is being prepared;

      (b)   evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report our conclusions about
            the effectiveness of the disclosure controls and procedures, as of
            the end of the period covered by this report based on such
            evaluation; and

      (c)   disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal quarter that has materially
            affected, or is reasonably likely to materially affect, the
            registrant's internal control over financial reporting; and

5.    The registrant's other certifying officers and I have disclosed, based on
      our most recent evaluation, to 5 the registrant's auditors and the audit
      committee of registrant's board of directors (or persons performing the
      equivalent functions):

      (a)   all significant deficiencies in the design or operation of internal
            controls over financial reporting which are reasonably likely to
            adversely affect the registrant's ability to record, process,
            summarize and report financial information; and

      (b)   any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal controls.

Date: May 14, 2004             /s/ JULIANNE M. BIAGINI
                               ------------------------------------------------
                               Julianne M. Biagini
                               Senior Vice President and Chief Financial Officer
                               (Principal Financial and Accounting Officer)