Exhibit 10.27


                        AMENDMENT TO EMPLOYMENT AGREEMENT
                           Modified FY98(a) Bonus Plan

This amendment  ("Amendment") to the Employment Agreement ("Agreement") executed
between Exigent International,  Inc. and Don F. Riordan, Jr. dated June 11, 1997
is entered into as of September  14, 1998 between  Exigent  International,  Inc.
("Exigent"),  a corporation  duly  authorized and existing under the laws of the
State of  Delaware  with a  principal  place of  business  at 1225  Evans  Road,
Melbourne,  Florida 32904 and Don F. Riordan,  Jr.  ("Employee"),  an individual
domiciled at 414 La Costa Street, Melbourne Beach, FL 32951.

NOW, THEREFORE,  for one dollar and other good and valuable  consideration,  the
receipt and  sufficiency of which is hereby mutually  acknowledged,  Exigent and
Employee hereby agree as follows:

1.       Modified FY98(a) Bonus Plan.  Notwithstanding  anything to the contrary
         in the  Agreement  and  subject  to the  terms and  conditions  of this
         Amendment,  Exigent hereby agrees to provide and Employee hereby agrees
         to accept the following bonus  compensation for Employee's  performance
         in fiscal year  1998(a)  (i.e.,  February 1, 1997  through  January 31,
         1998):  $0 + 24,533  stock  options  from plan 6NQ.  This  bonus  shall
         supersede and replace any bonus to which Employee may be entitled under
         the Agreement.  The Agreement  shall be deemed  modified and amended to
         the extent  necessary to  implement  the terms and  conditions  of this
         Amendment.

2. Option Price. The option exercise price shall be $3.375 per share.

3.       Grant.  The  granting of the options  shall be in  accordance  with the
         terms and  conditions of the stock option  agreement for Plan 6NQ which
         is incorporated herein by this reference.

4.       Dollar  Amounts.  Any dollar amounts  included in the Modified  FY98(a)
         Bonus Plan  described in Section 1 above are subject to all  applicable
         withholding taxes and any other deductions required by law.

5.       Satisfaction.   Employee  hereby   acknowledges  and  agrees  that  the
         foregoing  Modified  FY98(a) Bonus Plan described in Section 1 above is
         fair,  reasonable and satisfactory.  As such, Employee hereby agrees to
         release  Exigent  (and  all  of  its  subsidiary   companies)  and  its
         respective  officers,  directors  and agents  from any and all  claims,
         right, or demands that Employee,  or Employee's successors and assigns,
         has or may have as a result of or  arising  from the  Modified  FY98(a)
         Bonus Plan.

6.       Ratification  and  Approval.  In all other  respects  the  Agreement is
         hereby  ratified by Exigent and  Employee and remains in full force and
         effect, as previously amended.


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IN WITNESS  WHEREOF,  this  Amendment  has been duly executed as of the date set
forth above and is retroactively effective from January 31, 1998.

For Exigent:                                         For Employee:

Exigent International, Inc.                          Don F. Riordan, Jr.


By: /s/ B.R. Smedley                                 By: /s/ Don F. Riordan, Jr.
    ----------------------------                       -------------------------
                  (signature)                                  (signature)

Name:  B.R. "Bernie Smedley
      --------------------------

Title:  Chief Executive Officer
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