Hello.
We are a team with a lot of experience in computer security related jobs.
Our proposal is to make a security test using different authomated tools against server and application to have a first vision of security state of the system. Based on that results we will perform a second manual and deeper security review.
At the end We will deliver to you a report with all tested aspects, their results and recommendations for improvement.
This is an important note, we don't make fixes to the system, only the security review and the report. If necessary we communicate with the technical team that works for you if they need some help.
FYI, There are also other deeper security analysis much more complex, using heuristic methodologies, but the cost and time are higher.
Sincerely, creasmartmedia team.