Selahaddin Islamoglu
Software Developer

Project: Cloud-native IMS Core Platform

• Worked forng-voice - The Hyperscale IMS Solution product.
• Worked on IMS core network architecture, with focus on telecom signaling, service interaction, and charging systems (Diameter, SIP-based IMS architecture).
• Developed FreeDiameter extensions implementing load balancing and session stickiness, enabling scalable and highly available routing of Diameter charging traffic.
• Contributed to online charging system (OCS) integration, troubleshooting, and system-level enhancements, improving Diameter charging message flows, integration stability, and overall system reliability in production-like environments.
• Developed MMTel (Multimedia Telephony) announcement features supporting multiple call scenarios, enhancing IMS voice service delivery and end-user experience in telephony services.
• Performed integration testing and system validation, using Docker and Kubernetes in cloud-native containerized telecom environments.
• Developed and extended C-based SIP core components (OpenSIPS, Kamailio), improving SIP routing logic, call handling, and signaling performance within IMS infrastructure.

• Building a solid foundation in C++ and Go, focusing on language fundamentals, clean coding practices, and real-world applications.
• Strengthening software development fundamentals, including data structures, algorithms, design patterns, and version control.
• Exploring software engineering concepts such as system design, APIs, and modern backend practices.

Project: Contact Center Automatic Call Distribution

• Worked forAvaya - Contact Center Extended Capacity product on the behalf of Orion Innovation.
• Participated in the takeover of a legacy project from a third-party vendor; contributed to resolving inherited technical issues during the transition.
• Focused on optimizing traffic switchover from active to standby systems during failure scenarios, improving system reliability and performance.
• Actively worked with SIP messaging protocols and OpenSIPS for call routing and signaling.
• Designed and implemented a data persistence capability for the Call Detailed Recording (CDR) feature across active and standby nodes. Developed user-space applications on Linux using C++.

Project: Communication Server

• Worked forRibbon Communications - C20 Call Controller product on the behalf of Orion Innovation.
• Worked on the platform module that underpins the communication server. Resolved gating bugs to support a successful and timely release.
• Addressing issues related to software management features such as install, upgrade etc. Utilized C++ for development on a Linux environment.

Project: Cellular IoT Modules

• Worked for development ofCavli Wireless - C-Series IoT Modules product.
• Designed and implemented communication protocol APIs (FTP, HTTP, MQTT, etc.) for AT command interface to enhance system connectivity capabilities.
• Worked on the development of a cloud-based device management system for IoT modules.
• Successfully integrated these features into separate modules with diverse infrastructures.
• Programmed in C for both Linux and Real-Time Operating Systems (RTOS).

Project: WebRTC – SIP Gateway

• Worked forRibbon Communications - Kandy Link product on the behalf of Netas Telecommunication.
• Developed RTP media transportation layer capabilities and performance enhancement.
• Worked with communication protocols such as SIP, WebRTC, STUN, TURN, RTP, and RTCP.
• Implemented media layer modules for user space Linux applications using C programming.
• Gained experience in Java by contributing to the development of signaling modules for the gateway.

Project: Multi Access EDGE Computing Gateway

• An R&D project, developed with the support of TUBITAK.
• Participated in an edge gateway module implementation for the newly announced MEC standard.
• Developed a NETCONF configuration module for efficient configuration management.
• Used C for user space applications on Linux.

Project: OneM2M IoT Gateway

• An R&D project, developed with the support of TUBITAK.
• Participated a gateway module implementation for the newly announced OneM2M standard.
• Developed registration and data storage algorithms for user space applications on Linux using C

Graduate Project: Virtual Instrumentation Based Oscilloscope
The oscilloscope consist of 2 part ; signal processing card and computer interface. The signal data sampled in a time windows on card is displayed according to desired criteria on the computer screen.

Internship Projects: Pool ionization system, Heart rate monitor, TURKSAT 3USAT Cube Satellite Communication Board

Student Projects: Chess playing robot arm, Retro dotmatrix game console, 8x8x8 LED cube.

Voluntering: Head of Laboratory Committee and Executive Board Member at ITU IEEE Student Branch

ng-voice - The Hyperscale IMS Solution
Cloud-native software solution designed to deliver carrier-grade voice services (VoLTE, VoNR, and VoWiFi) for 4G and 5G networks. It is built specifically to address the high costs and complexity associated with legacy IMS hardware.

Avaya - Contact Center Extended Capacity
Single-server solution for large contact centers supporting 30,000 agents and 60,000 UC users with up to 57,000 calls concurrently.

Ribbon Communications - C20 Call Controller
Provides call and session control, network connectivity, switching, signaling, protocol interworking, voice and communications for service providers.

Cavli Wireless - C-Series IoT Modules
Cavli C-Series IoT modules are enterprise grade cellular connectivity modules with built-in eSIM/iSIM technology, pre-loaded with global cellular connectivity subscriptions powered by Cavli Hubble.

Ribbon Communications - Kandy Link
Kandy Link is a WebRTC -SIP gateway that uses REST signaling on the web side and maps the REST signaling into compliant SIP signaling on the SIP communications network side.

GitHub - selahaddinislamoglu
A collection of personal projects, open-source contributions, and code samples demonstrating my software development skills and interests.