MASTECH CORP
SC 13G/A, 1998-02-11
COMPUTER PROGRAMMING SERVICES
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934

                               (Amendment No. 1)

                              Mastech Corporation
                               (Name of Issuer)

                    COMMON STOCK, PAR VALUE $.01 PER SHARE
                    --------------------------------------
                        (Title of Class of Securities)

                                  57632N 10 5
                               ----------------
                                (CUSIP Number)


         Check the following box if a fee is being paid with this statement
[___].  (A fee is not required only if the filing person (1) has a previous
statement on file reporting beneficial ownership of more than five percent of
the class of securities described in Item 1; and (2) has filed no amendment
subsequent thereto reporting beneficial ownership of five percent or less of
such class.)  (See Rule 13d-7.)


         * The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.


         The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>
 
CUSIP No. 57632N 10 5                    13G                Page 2 of 6 Pages


 
    1  NAMES OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE
       PERSONS:

       Sunil Wadhwani
 
    2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) [ ]
       (SEE INSTRUCTIONS)                                        (b) [X]

    3  SEC USE ONLY
 
    4  CITIZENSHIP OR PLACE OF ORGANIZATION

       United States
 
        Number of          5  SOLE VOTING POWER          5,196,304
         Shares
       Beneficially
       Owned by Each
         Reporting
        Person With
 
                           6  SHARED VOTING POWER
 
                           7  SOLE DISPOSITIVE POWER     7,440,000*
 
                           8  SHARED DISPOSITIVE
                              POWER


    9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 
       REPORTING PERSON                                  7,440,000*
 
   10  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) 
       EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)       Not Applicable
 
   11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN 
       ROW 9                                                31.7%

   12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)           IN


                                      -2-
<PAGE>
 
Item 1(a).  Name of Issuer:

     Mastech Corporation

Item 1(b).  Address of Issuer's Principal Executive Offices:

     1004 McKee Road, Oakdale, PA  15071

Item 2(a).  Name of Person Filing:

     Sunil Wadhwani

Item 2(b).  Address of Principal Business Office or, if none, Residence:

     1004 McKee Road, Oakdale, PA  15071

Item 2(c).  Citizenship:

     United States

Item 2(d).  Title of Class of Securities:

     Common Stock, Par Value $.01 Per Share

Item 2(e).  CUSIP Number:

     57632N 10 5


Item 3.  If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
     check whether the person filing is a:

     Not Applicable


Item 4.  Ownership

 (a) Amount Beneficially Owned:

         7,440,000*


                                      -3-
<PAGE>
 
 (b) Percent of Class:

         31.7%

 (c) Number of shares as to which such person has:

         (i) sole power to vote or to direct the vote:

              5,196,304 shares

 
         (ii) shared power to vote or to direct the vote:

              Not Applicable

 
         (iii) sole power to dispose or to direct the disposition of:

              7,440,000 shares*

 
         (iv) shared power to dispose or to direct the disposition of:

              Not Applicable

 

Item 5.  Ownership of Five Percent or Less of a Class

  Not Applicable


Item 6.  Ownership of More than Five Percent on Behalf of Another Person

     Not Applicable


Item 7.  Identification and Classification of the Subsidiary which Acquired the
     Security Being Reported on By the Parent Holding Company

     Not Applicable


Item 8.  Identification and Classification of Members of the Group


                                      -4-
<PAGE>
 
     Not Applicable


Item 9.  Notice of Dissolution of Group

     Not Applicable


Item 10.  Certification

     Not Applicable



*See Exhibit A



                                      -5-
<PAGE>
 
                                 SIGNATURE


After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


                                February 10, 1998 
                               ---------------------------------  
                               Date

                               /s/ Sunil Wadhwani
                               ---------------------------------  
                               Signature


                               Sunil Wadhwani
                               ---------------------------------  
                               Name



                                      -6-
<PAGE>
 
                                   Exhibit A
                                   ---------

*    Includes 2,243,696 shares held by various family trusts as to which the
     reporting person serves as a co-trustee with sole dispositive powers over
     the trust assets but no voting power over such assets.


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