Vjeran Marcinko, Domain-driven Design (DDD) Developer in Osijek, Croatia
Vjeran Marcinko

Domain-driven Design (DDD) Developer in Osijek, Croatia

Member since October 28, 2013
Vjeran is a Java architect and developer working solely as a teleworker for over 13 years. He boasts extensive experience designing and implementing complex systems, mostly server-side. He has expert knowledge of domain modeling and object-oriented architectures, and loves learning new technologies.
Vjeran is now available for hire

Portfolio

Experience

  • Java, 18 years
  • Hibernate, 13 years
  • Domain-driven Design (DDD), 12 years
  • Spring, 10 years
  • Tapestry, 9 years
  • Cassandra, 1 year
  • Neo4j, 1 year
  • Hadoop, 1 year

Location

Osijek, Croatia

Availability

Part-time

Preferred Environment

Linux, Intellij IDEA, Git, Gradle

The most amazing...

...thing I've ever created is a generic adapter for communication with any remote device connected to the M2M platform.

Employment

  • Senior Java Developer and Architect

    2004 - PRESENT
    Kapsch Carrier Com Croatia
    • Created an over-the-air configurator for delivery of configuration profiles to mobile handsets, such as ones for configuring GPRS/CSD connection, a WAP browser, e-mail settings, and more. Developed using Spring, Jakarta Turbine, Jakarta Velocity, and Torque. Worked in a team of two as project leader, architect, and developer.
    • Created the web administration console for a message gateway server in a completely remote capacity. Communicated via the gateway’s management SOAP web service. Used the Jakarta Tapestry web framework for presentation and the Apache Axis library for SOAP communication.
    • Upgraded a platform for mass SMS distribution. Provided complex hierarchical organization of entities and a statistical overview. Used Spring for the business layer, Jakarta Turbine for web, Torque as an O/R layer, and Quartz for scheduling.
    • Created an MGW client library, a user-friendly layer built on top of ParlayX web service stubs, for sending and receiving SMS/MMS/WAP Push SI messages. Implemented it to be extensible for support of other types of binary messages. Developed a WBXML encoder for binary compression of XML messages, utilized for WAP Push SI message compression. Used the Apache Axis and JDOM libraries.
    • Architected a number portability central database platform for a Croatian telecommunication agency. Provided support services (web portal and web services) for porting numbers between mobile and fixed operators. Utilized JBoss AS and Spring (business logic), Jakarta Tapestry (web), iText (PDF reporting), and Apache Axis (web services).
    • Created a transaction server acting as a user-friendly gateway for prepaid/postpaid billing. Implemented on-request or subscription-based charging. Used the following frameworks: Apache Tapestry, Spring, Quartz, and plain JDBC/SQL as a persistence layer.
    • Created a web console as well as some core platform functionality for managing various services related to roaming subscribers, such as service activation/deactivation, scheduled execution, and source data filtering. Worked in a team of two, mainly as a web developer with some involvement with the platform’s service layer. Used Apache Tapestry, Spring, Quartz, and plain JDBC/SQL as the persistence layer.
    • Developed a platform for managing business processes for Value Added Services in Telco companies. Used Spring, Quartz, Hibernate, Tapestry.
    • Architected the majority of core functionality for a Machine-to-Machine (M2M) platform operating as a Big Data system for collecting and processing data from remote devices in the field. Also developed some portions of JavaScript web front-end. Worked in a team of 7. Used the following technologies: JavaScript, Cassandra, Neo4j, MySQL, RabbitMQ, Spring, MyBatis, Hazelcast, MQTT, REST, Liferay, and Hadoop.
    Technologies: Java, Spring, Hibernate, Tapestry, Cassandra, Neo4j, Hadoop, Turbine, Velocity, Quartz, SOAP, Axis, ActiveMQ, RabbitMQ, MyBatis
  • Java Developer

    2001 - 2004
    Alterbox.Hr
    • Created a chat system consisting of client applets and a Java server based on Jakarta Avalon technology. Integrated a virtual call center platform. Consisted of a Java 1.1 user applet for WAN usage and a Java 1.4+ applet for administrators inside the application's LAN.
    • Created a firewall tunneling solution for Java using periodic HTTP POST requests to simulate constant socket connection. Wrote the client side consisting of a thin client library, usable on the Java 1.1+ platform. Wrote the server side implemented by Java Servlet technology. Utilized event-based (NIO) networking for high performance on the server side.
    • Created a J2ME/MIDP client application for the unified messaging platform, communicating through the XML-RPC interface.
    • Developed an auto-generator of a custom expression language manual from custom tags in source files.
    • Handled load testing of a unified messaging platform using Jakarta JMeter with custom developed samplers. Simulated hundreds of simultaneous clients.
    Technologies: Java, Applets, Apache Avalon, NIO, Servlets, J2ME, XML-RPC

Skills

  • Languages

    Java, XML, SQL, HTML, JavaScript, Clojure
  • Frameworks

    Hibernate, Tapestry, Spring, JUnit, Netty, TestNG, Hadoop, Angular
  • Tools

    Servlet, IntelliJ IDEA
  • Libraries/APIs

    MyBatis, Quartz
  • Paradigms

    Object-oriented Programming (OOP), Test-driven Development (TDD)
  • Storage

    Neo4j, Cassandra
  • Other

    SOAP, Domain-driven Design (DDD), Cascading
  • Platforms

    Du Linux, Linux

Education

  • Master's degree in Electronical Engineering
    1995 - 2001
    Faculty of Electronical Engineering - Osijek, Croatia

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