App translation into Spanish

We have an app (mobile & web) which is used by airports for weather condition reporting. We'd like this localised into Spanish (it is currently available in English, German, French and several other languages). It is not a huge amount to translate (~450 phrases/2000 words) but some of it is quite technical / domain-specific and may require some research to do properly. We are available for Q&A along the way. We will require you to also verify the localisation in the app, making sure that it makes sense in context. We are looking for native Spanish speakers only. We will not accept machine translation. :)