the UK will have to renegotiate a trade agreement with the US, but part of the brexit argument is that the UK will be able to separately pursue a trade agreement with India, which has been held up for a decade or so in the EU. The EU is notoriously slow and has relatively few trade agreements (compared to other 'developed' entities) so, outside of the eurocentric perspective, i.e. looking toward the broader world like china, japan, india, africa, south america, being out of the EU is potentially a better choice for the UK.

One can imagine having favorable trade and immigration deals with India could be really great for IT in the UK.