newcommand reshead [1]{par noindent colorbox{black}{begin{minipage}
{textwidth}{color{white} centering bfseries {#1}} hfill end{minipage}}}

%% (c) Shashwat Pant
%% Resume - C.V of Shashwat Pant
%% September 17th 2012

documentclass[letterpaper,12pt]{article}
%usepackage[charter]{mathdesign}
% usepackage{charter}
% usepackage{mathpazo}
%usepackage{kpfonts}
%usepackage{geometry}
usepackage{palatino}
usepackage{url}
usepackage[empty]{fullpage}
usepackage{color}
%definecolor{mygrey}{gray}{0.95}
%usepackage{xcolor}

newcommand reshead [1]{par noindent colorbox{black}{begin{minipage}{textwidth}{  color{white} centering bfseries {#1}} hfill end{minipage}}}


begin{document}

begin{center}

bfseries {huge {Shashwat Pant}} \
bfseries E-Mail - shashwat.pant@gmail.com ~ Voice -
hrule hrule
 end{center}

noindent Seeking a challenging career to gain experience in rich evolving computing in the areas of :
begin{itemize}
    item
    item Parallel and Vector computing (Open CL)

end{itemize}


reshead{Professional Profile}



end{document}

documentclass[letterpaper,12pt]{article}
usepackage[empty]{fullpage}% http://ctan.org/pkg/fullpage
usepackage{xcolor}% http://ctan.org/pkg/xcolor
usepackage{changepage}% http://ctan.org/pkg/changepage

newcommandreshead[1]{%
  parnoindent%
  colorbox{black}{makebox[dimexprlinewidth-2fboxrule-2fboxsep][c]{textcolor{white}{bfseries #1}}}}

begin{document}

begin{adjustwidth}{2em}{2em}
  begin{center}
    bfseries
    {huge Shashwat Pant} \
    E-Mail - shashwat.pant@gmail.com ~ Voice - \
  end{center}

  noindenthspace*{-1em}rule{dimexprlinewidth+2em}{2pt}

  noindent Seeking a challenging career to gain experience in rich evolving computing in the areas of :
  begin{itemize}
    item
    item Parallel and Vector computing (Open CL)
  end{itemize}
end{adjustwidth}

bigskip

reshead{Professional Profile}

end{document}​

%% (c) Shashwat Pant
%% Resume - C.V of Shashwat Pant
%% September 17th 2012

documentclass[letterpaper,12pt]{article}
%usepackage[charter]{mathdesign}
% usepackage{charter}
% usepackage{mathpazo}
%usepackage{kpfonts}
%usepackage{geometry}
usepackage{palatino}
usepackage{url}
usepackage[empty]{fullpage}
usepackage{color}
%definecolor{mygrey}{gray}{0.95}
%usepackage{xcolor}

newcommandreshead[1]{%
  parnoindent
  colorbox{black}{%
    begin{minipage}{dimexprtextwidth-2fboxseprelax}
    color{white}centeringbfseries#1
    end{minipage}%
  }%
}


begin{document}

begin{center}
bfseries
{huge Shashwat Pant} \[1ex]
E-Mail - shashwat.pant@gmail.com ~ Voice -

% Here I reduce the rule by 1in on both sides (adjust to suit)
% The rule thickness is 1pt; it's 2pt from the bottom of the text above it
nointerlineskip
moveright 1in vbox{hsize=dimexprhsize - 2in relax
  vskip 2pt % separation from the text above
  hrule width hsize height 1pt % rule thickness
}
end{center}


noindent Seeking a challenging career to gain experience
in rich evolving computing in the areas of:
begin{itemize}
    item LaTeX
    item Parallel and Vector computing (Open CL)

end{itemize}


reshead{Professional Profile}



end{document}

dimexprtextwidth-2fboxseprelax