How to find out the SoC code under which I am sponsored

Hi,
I am currently hired as a "Graduate Engineer - Advanced Engineering". I had switched in the country from Tier 4 to Tier 2. I am due for a promotion which would increase my salary and change my role to "Design Engineer - Advanced Engineering". The visa was applied by my company through an immigration agency who havent provide me information about my SoC code. How do I find out what my SoC code is to make sure the new job title matches the current one to avoid any possible issues with my sponsorship.I am unable to find the code in any of my documents provided to me and my company isn't exactly helpful in this regard.
Regards,
Nehalorn