Hello,
If I understood correctly, you are looking fora person/teamp to support you on changes from time to time.
If that's correct, my team provides exactly that kind of support in different áreas, from marketing, to web site maintenance, quality assurance and development (Java & PHP stacks)
We also provide out of the box Open Source solutions like vTiger, Magento/Joomla, virtual stores, etc.
We are a team where Seniors have upt to 17 years of experience on the IT Development and Consulting, located in Mexico, fluent in English and with certifications as PMP, Testers, Six Sigma, among others
Please let us know how can we help and if you are interested on having a conference