I did work 6 year developing a Transactional Bill & Payment Gateway using Java Stack and implementing the Parser used for route every transaction. (Use Java Interfaces with Parsers is like use Magic)
My Little Resumen:
Computer Sc Engineer
Java and C/C++ Developer with Infrastructure skills
EXPERIENCE
PUNTOXPRESS - El Salvador - Java Programmer Analyst (02/2010 - 07/2016)
The biggest network for Billing & Payments, Money Transfers and Top-Ups in El Salvador
Main Role:
Design and develop the Back-End under Java EE environment. Using EJB, JPA, Web Services.
The Back-End(Core) is provided by 3 Gateways used for route every transaction to the right
provider client (socket, web service, mq, bash data load, etc).
Billing & Payments: Receive the payment for companies like electricity, internet, etc Top-Ups:
Sell top-ups for Claro, Digicel, Tigo, Telefonica, IBW, etc
Cashiers: Receive Bank transactions for Citi Bank, Scotiabank, Banco Agricola, etc,
Back Ground Role: Setup and administrate the Production Environment with:
Glassfish Application Servers under Solaris
Apache Load Balancer under Ubuntu Linux
Postgres and Mysql Databases under Linux
OS Virtualization Environment for the Servers using VMWare ESXi.
Administrate the Cisco Switch used for the servers intercommunication.