need help in security

Hi all,

I need some developer to make some works for me 

there is a team develop a website for me by CodeIgniter and they left the work 

now the site is working fine but it has some security issue 

when I test it with a Hacker guy he access to admin panel in 5 minutes only and he told me that there's a bug in SQL with site

so is there any one can test the site and scan it to see if there are security problems then fix it? 

I can't put the URL here so if any one can work with me please let's contact by email or phone no.