Full Back-end Design and development of accounting system(800 users daily connected). Performance measurement and application tuning activities. SAP-SI2 synchronisation.(C,C++ and java implementation) Interfaces(In/Out) to other local Systems for mass transactions(several millions/year). Internal system documentation and audit. Back-end development of web invoicing system in Java. Dynamic business logic implementation, support and upgrading of Databases for Agencies. Technical implementation of invoice web application using J2EE. Technical team coordination.