Design and development of websites for online sales and commerce (internet) website administration, on-line promotion and return on investment of communication tools via the internet; design and development of mobile apps for online sales and commerce (internet), website administration, on-line promotion and return on investment of communication tools via the internet; design and development of software for online sales and commerce (internet), website administration, on-line promotion and return on investment of communication tools via the internet; Installation, maintenance and updating of software for the maintenance of business computing, marketing and sales follow-up; installation, maintenance and updating of websites for the maintenance of business computing, marketing and sales follow-up; installation, maintenance and updating of mobile apps for the maintenance of business computing, marketing and sales follow-up