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Work Background
EndavaVoip Engineer
Mar. 2025 - Jun. 2025Belgrade🧩 Designed and built proof-of-concept (PoC) VoIP/SBC environments integrating Asterisk PBX, Kamailio SBC, and Anynode SBC
🔐 Demonstrated secure SIP interoperability (TLS/SRTP) between platforms, including bridging non-secure (RTP/UDP) and secure (SRTP/TLS) networks with CCaaS (BYOC)
🎧 Implemented SBC logic using Kamailio + RTPengine, including media anchoring, SRTP bridging, and SDP normalization
🔄 Developed advanced SIP routing and header manipulation (Via, Contact, From/To rewriting) to ensure cross-vendor compatibility
📞 Simulated and resolved complex call flow scenarios (INVITE, 200 OK, ACK, BYE) including call teardown and signaling edge cases
🌐 Tested and validated NAT traversal, ICE, and RTP/media path behavior in multi-network lab environments
⚙️ Built PoC integrations with Anynode SBC, resolving TLS handshake and SIP interoperability challenges
🛡️ Customized RTPengine SRTP crypto negotiation to control supported encryption profiles
🧪 Delivered fully functional lab environments replicating real-world VoIP deployment scenarios
EndavaFirewall Engineer
Mar. 2025 - Apr. 2025Belgrade🔗 Designed and implemented integration between CCaaS platform (Node.js) and customer SOAP-based services
🔄 Developed Node.js middleware to consume and transform SOAP APIs
🔐 Configured F5 BIG-IP to act as a secure entry point, including SSL termination and traffic forwarding to backend services
🌍 Implemented HTTPS-to-HTTP bridging, allowing external secure requests to be processed by internal SOAP services
⚖️ Managed request routing and virtual server configuration on F5 for reliable API delivery
☁️ Ensured secure and scalable communication between cloud services and on-prem/customer systems
🧠 Troubleshot connectivity, SSL, and API communication issues across multiple layers (client, F5, backend)
EndavaContact Center Consultant
Feb. 2024Belgrade🤝📞☁️ Evaluating customer inquiries related to contact centers, cloud telephony, and chatbots. Assessing technical feasibility, defining and implementing appropriate solutions.
🔗⚙️🤖 Designing and implementing API-based integrations between Contact Center, Zendesk, and Salesforce using Node.js in Contact Center low-code/ no-code widgets. Leveraging REST and SOAP APIs for real-time call event handling, ticket creation, CRM updates, and data synchronization. Analyzing and resolving issues identified during beta testing.
🌐 🤖📊 Using Cheerio (Node.js) to scrape structured content from external websites and automatically populate the chatbot knowledge base with up-to-date informational data. Implemented intent detection and entity modeling to accurately identify customer queries requiring precise, validated responses from the chatbot. Improved response accuracy and user experience by ensuring fact-based answers for information-only inquiries.
📄🎓🚀 Creating solution design documentation, submitting feature requests to product and engineering teams. Providing customer training to ensure successful adoption.
EndavaSoftware Tester
Dec. 2015 - Feb. 2024Belgrade, SERBIA1️⃣ Led end-to-end functional, performance, and scalability testing using Cypress/Cucumber, JMeter, WebDriver, SQL, and KPI monitoring tools.🔍⚙️📊
2️⃣ Managed QA for identity, e-commerce, insurance, and unified communications platforms, leveraging Jenkins, Bitbucket, JIRA/XRay. Validating defects and system performance.🧪🧩🛠️
3️⃣ Built and maintained CI/CD pipelines and a hybrid Java/Selenium automation framework, using Ansible and Tcl/Tk to optimize test execution, log analysis, and continuous delivery.🚀🔁🤖
PSTechSoftware Tester
Mar. 2006 - Nov. 2015Belgrade, SERBIA🛠️📞💬 Performed comprehensive testing of VoIP softphones and messaging applications, including installation, configuration, administration, and troubleshooting of unified communications servers.
📊⚙️🔥 Conducted performance, stability, and stress testing under high system load, adverse network conditions, and extended audio/video calls while monitoring CPU and memory usage.
🎧📡🔍 Evaluated audio/video quality, codec and hardware impact, connectivity changes, and verified system reliability by identifying customer-reported issues, memory leaks, and CPU bottlenecks.
ASW InženjeringSoftware Developer
Jun. 2005 - Feb. 2006Belgrade, SERBIA
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