A wide variety of development services are available involving websites or ecommerce carts.
Some common development services:
API Integration
Calendars
Calculators
Custom Addons/Plugins/Extensions
Feed Integration
Contact Forms
Import/Export Tools
Payment Processor Integration
Template Adjustments
My SQL Databases
Website/Cart Troubleshooting and Debugging
If you already have a cart or website, there are many progressive components which can be added to help you advance it.
The possibilities are endless so please do not hesitate to contact me with your intentions.