Part-time web script/app programmer

I am looking to hire a programmer for ongoing work on a new website I would like to develop. It is in the field of online conversions, and I need someone to write the code that can perform the conversions that visitors need doing. This will start with the most common stuff like metric conversions, distance, volume, area etc etc and then move onto new stuff as we get the basics covered.

It will also be important that such conversion calculators are presented well so that visitors will come back to my site, so all user interfaces need be pleasing and intuitive. Good CSS/HTML skills would beneficial for this. It is easy to find the most popular conversion sites on the Internet and basically I want to match their offering and then move forward with my own ideas.

I plan to base the website on the WordPress platform as I am familiar with this, and conversion calculators will be assigned to pages where their code can be included. If this is not an efficient solution that I am open to discuss alternatives.

I will be attending to the design of the website, traffic generations, social media promotion etc as seperate issues and the purpose of the programming work is initially centred on designing conversion calculators that look great and work perfectly. If scripts already exist that would be better to just integrate into the site instead of re-creating them, then integration work would also be for the programmer so no need to fear losing out on work to existing solutions, I would rather hear about them and then we can move on to our own custom stuff to add more value for visitors.

This will be a long-term project and I can hopefully offer more hours as the website starts to earn some revenue. Initially, I would like to invest in enough hours to get the site running, then have a regular weekly amount of hours to continually build the amount of converstion tools available over time. I would like to forge a relationship with someone who will be in the game longterm and is looking to build a portfolio of longterm clients instead of just doing one-offs.

Any bids should include an estimate of the number of hours it would take to get the sit up a running with a collection of the standard types of conversions that people search for, and the minimum number of hours you would be willing to commit over the long-term.

I have never hired for such work before so I am unsure if I have given the correct amount of information etc for people to bid, please feel free to ask for questions etc.