My responsibilities there were:
First to serve as Lead. At first I was lead for several products but as time went on I assumed lead of all technology at the company. By the end of my time there I was in a Director position setting the technology strategy company-wide and leading a department of developers and interns that I had personally hired.
Second, to serve as Architect and Sr Engineer. I architected solutions to migrate the company's two legacy products to a Service Oriented Architecture, using .Net web services and Flex front-end. I architected a blue-print for the company to create mobile pieces to plug into their newly forming enterprise. I also created a plan to create build servers where database topography and pre-built templates would be used to generate code and build new instances of products for client installs.
When I left, the development department was rebuilt and energized with a good technology road map to lead them well into the next two years.