Document:

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                                                                   Exhibit 10.25

                   [Letterhead of Dynacs Engineering Co. Inc.]

                                PROMISSORY NOTE

$200,000                                                        Palm Harbor FL,
                                                                June 10, 1999

FOR VALUE RECEIVED, the undersigned, a Florida Corporation, promises to pay to
the order of Robert Skelton or Judith Skelton (herinafter referred to as the
"Payees") at 445 Sea Lane, La Jolla, California 92037, or at such other place as
the Payees hereof may, from time to time, designate in writing. the principal
sum of Two Hundred Thousand Dollars ($200,000), with simple interest thereon
calculated at the rate of 12% per annum, from the date hereof until Maturity.
All principal shall be due and payable in full SIX MONTHS ("Maturity") from the
date hereof. The interest shall be due and payable on the 10rd day of each month
beginning July 1999, until Maturity.

Each and all payments shall be applied first to interest at the rate of
aforesaid upon the principal sum or so much thereof as shall from time to time
remain unpaid, and the balance shall be applied on account of principal.

In the event of a default under this Note, the undersigned shall pay all costs,
and expenses of collection, including reasonable attorneys' fees.

This note is not assignable by either the payees or the undersigned Maker.

This note is to be construed and enforced according to the laws of the State of
Florida.

SEAL OF THE CORPORATION                        Dynacs Engineering Company, Inc.

                                               By: /s/ Ramendra P. Singh
                                                   -------------------------
                                                   RAMENDRA P. SINGH
                                               As: President/CEO<PAGE>   1

                                                                   Exhibit 10.26

                   [Letterhead of Dynacs Engineering Co. Inc.]

                                PROMISSORY NOTE

$250,000                                                       Palm Harbor FL,
                                                               February 23, 1999

FOR VALUE RECEIVED, the undersigned, a Florida Corporation, promises to pay to
the order of Ravi Venugopal (herinafter referred to as the "Payee") at 1528
Colony Ct., Palm Harbor, Florida, or at such other place as the Payee hereof
may, from time to time, designate in writing, the principal sum of Two Hundred
Fifty Thousand and No/100 Dollars ($250,000.00), with simple interest thereon
calculated at the rate of 12% per annum, from the date hereof until Maturity.
All principal shall be due and payable in full SIX MONTHS ("Maturity") from the
date hereof. The interest shall be due and payable on the 23rd day of each month
beginning March 1999, until Maturity.

Early Repayment

In the event the Undersigned wishes to repay the principal amount, in part or
whole, before Maturity, ten interest on the portion of the Principal repaid
shall be calculated as set forth below:

-     for portions of the Principal held for greater than three (3) months but
      less than six (6) months from the date hereof, interest shall be
      calculated at the rate of 1.33 % per month, with the period rounded to the
      next larger whole month;

-     for portions of the Principal held for greater than one (1) months but
      less than three (3) months from the date hereof, interest shall be
      calculated at the rate of 1.94 % per month, with the period rounded to the
      next larger whole month;

-     for portions of the Principal held for greater than two (2) weeks but less
      than one (1) month from the date hereof, interest shall be calculated at
      the rate of 0.51 % per week, with the period rounded to the next larger
      whole week;

-     for portions of the Principal held for less than two (2) weeks from the
      date hereof, interest shall be calculated at the rate of 0.55 % per week,
      with the period rounded to the next larger whole week;
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Each and all payments shall be applied first to interest at the rate of
aforesaid upon the principal sum or so much thereof as shall from time to time
remain unpaid, and the balance shall be applied on account of principal.

In the event of a default under this Note, the undersigned shall pay all costs,
and expenses of collection, including reasonable attorneys' fees.

This note is not assignable by either the payee or the undersigned Maker.

This note is to be construed and enforced according to the laws of the State of
Florida.

SEAL OF THE CORPORATION                         Dynacs Engineering Company, Inc.

                                                By: /s/ Ramendra P. Singh
                                                    -------------------------
                                                    RAMENDRA P. SINGH
                                                As: President/CEO
<PAGE>   3
                          AMENDMENT TO PROMISSORY NOTE

     This Amendment to Promissory Note (the "Amendment") dated August 22, 1999
and between Dynacs Inc. (formerly known as Dynacs Engineering Co., Inc.) (the
"Company") and Ravi Venugopal (the "Payee").

     Reference is made to that certain promissory note dated February 23, 1999
by and between the Company and Payee in the principal amount equal to $248,000
(the Promissory Note").

     The parties agree that the Maturity of the Promissory Note shall be
extended to August 23, 2000.

     All other terms and conditions of the Promissory Note shall remain in full
force and effect.

                                                  DYNACS INC.

                                                  By: /s/ Ramendra P. Singh
                                                      --------------------------
                                                      Ramendra P. Singh<PAGE>   1

                                                                   Exhibit 10.27

                   [Letterhead of Dynacs Engineering Co. Inc.]

                                 PROMISSORY NOTE

$89,301.44                                                    Palm Harbor, Fl.
                                                              August 23, 1999

FOR VALUE RECEIVED, the undersigned, a Florida Corporation, promises to pay to
the order of Anil K. Singh (hereinafter referred to as the "Payee") at 128
Harbor Dr., Palm Harbor, Florida, or at such other place as the Payee hereof
may, from time to time, designate in writing, the principal sum of Eighty Nine
Thousand Three Hundred and One and 44/100 Dollars ($89,301.44), with simple
interest thereon calculated at the rate of 12% per annum, from the date hereof
until Maturity. All principal shall be due and payable in SIX MONTHS
("Maturity") from the date hereof. The interest shall be due and payable on the
23rd day of each month beginning beginning September 23, 1999, until Maturity.

Early Repayment

In the event the Undersigned wishes to repay the principal amount, in part or
whole, before Maturity, then interest on the portion of the Principal repaid
shall be calculated as set forth below:

-     for portions of the Principal held for greater than three (3) months but
      less than six (6)months from the date hereof, interest shall be calculated
      at the rate of 1.33% per month, with the period rounded to the next larger
      whole month;

-     for portions of the Principal held for greater than one (1) month but less
      than three (3) months from the date hereof, interest shall be calculated
      at the rate of 1.94% per month, with the period rounded to the next larger
      whole month;

-     for portions of the Principal held for greater than two (2) weeks but less
      than one (1) month, from the date hereof, interest shall be calculated at
      the rate of 0.51% per week, with the period rounded to the next larger
      whole week;

-     for portions of the Principal held for less than two (2) weeks from the
      date hereof, interest shall be calculated at the rate of 0.55% per week,
      with the period rounded to the next larger whole week;

Each and all payments shall be applied first to interest at the rate of
aforesaid upon the principal sum or so much thereof as shall from time to time
remain unpaid, and the balance shall be applied on account of principal.

In the event of a default under this Note, the undersigned shall pay all costs,
and expenses of collection, including reasonable attorneys' fees.
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This Note is not assignable by either the payee or the undersigned Maker. This
Note is to be construed and enforced according to the laws of the State of
Florida.

SEAL OF THE CORPORATION                         Dynacs Engineering Company, Inc.

                                                By: /s/ Harry W. Schubele, III
[SEAL]                                              ----------------------------
                                                    Harry W. Schubele, III
                                                As: Sr. Vice President, Business
<PAGE>   3

                          AMENDMENT TO PROMISSORY NOTE

     This Amendment to Promissory Note (the "Amendment") dated August 22, 1999
by and between Dynacs Inc. (formerly known as Dynacs Engineering Co., Inc.) (the
"Company") and Anil K. Singh (the "Payee").

     Reference is made to that certain promissory note dated February 23, 1999
by and between the Company and Payee in the principal amount equal to $89,301.44
(the "Promissory Note").

     The parties agree that the Maturity of the Promissory Note shall be
extended to August 23, 2000.

     All other terms and conditions of the Promissory Note shall remain in full
force and effect.

                                        DYNACS INC.

                                        By: /s/ Ramendra P. Singh
                                           ------------------------------------
                                           Ramendra P. Singh

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