Constantinos Valakas
EFT Software Engineer
Freelancer Software/Web Developer
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Proffesional Profile

EFT (Electronic Funds Transfer) Software Engineer in banking payment systems including ACI Postilion suite, EFT protocols (ISO8583, Visa Base I & II, MasterCard). EMV Integrated Circuit Card technology integration.

Software Engineer with substantial experience in programming in ANSI C, Java 2, C#, Perl as far as programming languages are concerned.

As for Web Technologies, I'm experienced in PHP, Javascript (AJAX, jQuery), XML-XSD, PayPal website integration, SEO optimization, OpenCart and Virtuemart e-commerce solutions and Joomla! CMS, while I've acquired good knowledge in database management systems such as MySQL and PostgreSQL.

Working Experience

EFT Senior Software Engineer

Codix SA

September 2006 - Present

  • Software Engineer - EFT specialist, developing in C# and Java, product management and support of ACI Postilion suite for banking solutions.
  • Development and integration of Postilion components (interchage and integration drivers, PostCard, Postilion Office plug-ins). Product support and consulting services.
  • Development of banking applications in .NET platform (C#).
  • Development of banking applications in Android platform.

Software/Web Developer


1998 - Present

  • Development of .NET applications (C#).
  • Website development.
  • SEO optimization
  • Virtuemart and OpenCart integration.
  • Great working experience in Joomla! CMS integration and development (custom components & modules).
  • PHP software for GIS application in urban observatories.

Software Engineer

Intracom SA

March 2006 - September 2006

  • Sun Identity Manager support engineer.

Software Engineer

Hellenic Army

November 2005 - April 2006

  • Project Manager in Military's internal software developed in Java 2.
  • Director of the local Research & Informatics office of 80th National Guard Supreme Command in Kos island.


National Technical University of Athens

February 2004 - November 2004

  • Implementation and support of web portal in ASP 6.0.
  • Network support of the School of Architecture LAN.


Altec SA

October 2000 - October 2003

  • EFT-POS software development for Ingenico terminals in ANSI C using Borland C++.
  • Metavante CSF suite support and consulting services.

Freelancer Projects

City of Komotini Urban Observatory software tool

2009 - 2010

  • Development of Urban Observatory software tool for the Municipality of Komotini.
  • Version 1.0 - Developed in PHP, PostreSQL - PostGIS and MapServer. Includes GIS features.

City of Pireas Urban Observatory software tool

2004 - 2008

  • Version 3.0 (2008) - Developed in PHP and PostreSQL - PostGIS and MapServer. Includes GIS features.
  • Version 2.0 (2007) - Developed in Microsoft C# 2005.
  • Version 1.0 (2004) - Developed in Microsoft VB6.


2006 - Present

Development of the following websites (mostly, the server-side part and the client-side code except for the front-end design):

  • MeCityCenter, (as a contractor with Netlayer Ltd)
  • GreenArc,
  • Anavra-Zo,
  • Vasiliki Studios,
  • Frontistirio Irakleitos, (old version)
  • Goura Environmental & Cultural Park,
  • Community of Anavra - Official Website (discontinued)

Community Library Management System


Development of a management system for Anavra Communal Library.

  • Book management.
  • Members registration.
  • Reporting in HTML and PDF.
  • Developed in C# with MysQL as database engine.

Museum Exhibits Management System


Development of a management system for the Community of Anavra's Folkloric Museum.

  • Exhibits archiving & management.
  • Reporting in HTML and PDF.
  • Developed in C# with MySQL as database engine.

Technical Skills

Electronic Funds Transfer (EFT)

Expert (since 2000)

  • EFT consultant.
  • EFT communication protocols: ISO8583, SPDH, Visa Base I & II, ISO8583 Postilion, DIASATM, BICISO.
  • Postilion suite developement and support. Development of custom components: interchange drivers, integration drivers, Postilion Office plug-ins, TermApp.Framework drivers.
  • EFT-POS software development.
  • Knowledge of EMV ICC specification for Payment Systems.

World Wide Web

Expert (since 1998)

  • PHP developement (websites & intranet applications).
  • Javascript, AJAX, jQuery.
  • Apache Web Server, Apache Tomcat.
  • Joomla! CMS integration and custom components development. OpenCart, Virtuemart e-commerce solutions.
  • PayPal integration.
  • Search Engine Optimization.


Expert (since 1995)

  • Software analysis & architecture.
  • ANSI C.
  • PHP
  • Java.
  • .NET framework (C#).
  • Perl.
  • IDEs: Microsoft™ Visual Studio, Eclipse, Aptana Studio.


Advanced (since 1998)

  • Oracle MySQL.
  • PostgreSQL, PostGIS.
  • Microsoft SQL Server

Mobile platforms

Beginner (since 2011)

  • Android Platform.


National Technical University of Athens

Master's degree, Computer & Electrical Engineering, 1995 – 2004

Grade: 7.34

My Diploma project (entitled: "WTL: Implementing a Wrapper Tepmplate language") was published in the 8th Panhellenic Conference on Informatics on November 2001, Nicosia, Cyprus.