Hi There,
Absolutely doable!
Reading thru the information provided we learned that you are in pursuit for a SharePoint developer who can assist you in creating an infopath sharepoint holiday request form that is interconnected with outlook.
We can certainly do this for you, as we have been working with SharePoint since its inception.
Having said that, as you might be knowing, Microsoft has already stopped providing updates to InfoPath and they don't recommend using InfoPath solutions for future needs.
We would recommend you to go with alternative solutions like creating forms with SharePoint App model, form using HTML, jQuery and SharePoint REST APIs, AngularJS App and so on.
We can do all of that as well and we request you to interact with us so that we can share additional details for our recommendation. The interaction would help you in sharing insights to your exact requirements.
We would also request you to elaborate a bit more on your requirement when you say interconnected with Outlook. This would definitely be helpful for us to recommend you with a best solution.
Look forward to talk to you soon.
Thank you,
Hardik S.