Java Developer
2017 - PRESENTSedamIT d.o.o.- Developed a lawful interception system for monitoring telecom network traffic.
- Created an RMS system for active VoIP call recording.
Technologies: Maven, Eclipse, Event-driven Programming, Spring, Git, PostgreSQLJava Developer
2013 - 2015Ericsson Nikola Tesla- Tested and coded a provisional gateway for HLR.
- Created support for LDAP by implementing openLDAP and custom Java LDAP servers.
- Built a high-performance LDAP server.
- Developed support for Linux tools.
- Optimized the TCP stack on Linux 2.6 and 3.0 kernel series.
Technologies: Eclipse, UnboundID, Event-driven Programming, LDAP, Git, Java, LinuxSoftware Tester
2011 - 2012Ericsson San Jose- Installed the Entrisphere/Ericsson BLM1500 multiplexer.
- Tested BLM1500 data, video, and voice services for the Spirent Test Center.
- Installed and supported Asterisk PBX for testing VoIP.
- Configured extreme L3 Switches.
- Troubleshot networks.
- Tested GPON access to the network with ONT terminal provisioning.
Technologies: GPON, UnboundID, Event-driven Programming, Git, SQLIntegration and Verification Engineer
2008 - 2011Ericsson Nikola Tesla- Conducted support for test tools.
- Tested Linux-based elements of Telephony Softswitch Solution 4.0.
- Troubleshot and diagnosed network problems.
- Conducted SIP protocol analysis.
- Integrated site system testing via installation and configuration of TGC/MGW elements.
Technologies: GPON, UnboundID, Git, TelephonyNetwork Administrator
2007 - 2007Siemens PSE- Supported the introduction of multicast in the company network.
- Created documentation for the network.
- Diagrammed network connections.
- Tested multicast on Cisco switches.
- Tested multicast across routers.
- Created final documentation and reported on test results.
Technologies: Multicast, Cisco
VoIP Developer in Split, Croatia
Member since April 9, 2014
Igor is a highly skilled technology enthusiast with over 13 years of experience in Java development, system administration, and more. He loves to experiment and work with new technologies. Igor is very proud of his ability to learn whatever is necessary to solve a problem at hand.
Igor is now available for hire
Portfolio
- SedamIT d.o.o.Maven, Eclipse, Event-driven Programming, Spring, Git, PostgreSQL
- Ericsson Nikola TeslaEclipse, UnboundID, Event-driven Programming, LDAP, Git, Java, Linux
- Ericsson San JoseGPON, UnboundID, Event-driven Programming, Git, SQL
Availability
Part-time
Preferred Environment
Eclipse, NetBeans
The most amazing...
...built a VoIP recording system for Cisco CallManager via test-driven development.
Employment
Experience
- SIP Load Balancerhttps://code.google.com/p/lb-sip/
A simple Java application which will do load balancing across several SIP servers, based on list, or periodic reports from SIP servers.
- VoIP Call Recording Systemhttp://scoreunit.com/voiprecorder.html
A Java-based back-end system for VoIP call recording that used Spring for the back end and Vaadin for the UI.
It included:
• SIP, RTP protocols, compression using G.729 standard.
• OPUS encoder and decoder with OGG file container.
Designed an alarm subsystem and the web UI. - Blagajnahttps://code.google.com/p/blagajna1/
A simple Java GUI application for issuing printed receipts on cashier systems, completed according to Croatian legislative requirements.
- Simple Management Systemhttp://git.toptal.com/Igor-Delac/igor-delac-2nd-attempt/wikis/home
A simple management front-end application coded in Java FX, to demonstrate REST approach and FX user interfaces. Back-end PHP and SQL scripts are also provided for integration into Apache web servers with a PHP module and MySQL database.
- VNC Server Library for Javahttps://github.com/idelac3/RFBService
A VNC allows remote connection and control of the host system, and it is used as an alternative to Microsoft RDP and TeamViewer.
This project shows how to implement the server-side protocol in pure Java. The official name of the protocol is "Remote Frame Buffer," or RFB for short.
This project compiles into a Java library as a JAR file, and it is also available as a Maven artifact. - Launching a Spring Boot Application Programmatically (Publication)Starting a Spring Boot application in the command line is as simple as it gets. But what if we want to run our application from another Java program? In this article, Toptal Java Developer Igor Delac demonstrates how you can start a Spring Boot app programmatically using just a few lines of code.
- Implementing a Remote Framebuffer Server in Java (Publication)Connecting to remote computers and working on them through terminals over a network is something we often take for granted. Technologies that enable us to do this have changed the way we work and have opened doors to amazing possibilities. Although the inner workings of these technologies may seem like obscure knowledge, implementations of many of these technologies are surprisingly straightforward. In this article, Toptal engineer Igor Delac gives us a step-by-step tutorial on how to implement the Remote Framebuffer server-side protocol in Java, allowing Swing-based applications to run and be interacted with remotely using standard VNC clients.
Skills
Languages
Java, Bash, Assembler, SQLFrameworks
Spring, Spring 5, Vaadin, Apache CXF, ThymeleafLibraries/APIs
Spring LDAP, libvirtTools
Maven, Asterisk, Remote Framebuffer Protocol (RFB), Eclipse IDE, OpenVPN, KVM/Qemu, GitParadigms
Procedural Programming, Event-driven Programming, ASN.1Platforms
Linux, JavaFX, UnboundID, Eclipse, NetBeans, Apache KafkaOther
Cisco, Telephony, LDAP, VoIP, Session Initiation Protocol (SIP), RTP, Multicast, GPON, FreeSWITCH PBX, CallManager, PKIStorage
PostgreSQL
Education
- Master's Degree in Electrical and Software Engineering2002 - 2008J. J. Strossmayer University - Osijek
Certifications
- CCNAAPRIL 2012 - PRESENTCisco
