The WLCG project is concerned with coordinating the efforts of large scientific computing centres and large university departments that have significant investments in computing and networking.
However schools and students can also get involved in some way.
If you wish to work on a project contributing to WLCG, you should contact a local university physics department that has some participation in the LHC physics program and discuss potential projects with them. Have a look at our REBUS Topology to see which institutes are taking part.
If you are based in the USA, there may be a local university that works with the Open Science Grid that can help you.