Position : VOIP Lead Engineer(Remote) About Eltropy (www.eltropy.com) - Eltropy is a rocket ship FinTech on a mission to disrupt the way people access financial services. Eltropy enables financial institutions to digitally engage in a secure and compliant way. Using our world-class digital communications platform, community financial institutions can improve operations, engagement and productivity. Community banks and Credit Unions use Eltropy to communicate with consumers via Text, Video, Secure Chat, co-browsing, screen sharing and chatbot technology — all integrated in a single platform bolstered by AI, skill-based routing and other contact center capabilities. Eltropy Values: No fear - tell the truth. Customers are our north star. Nothing is impossible. Job Description: We are seeking a Lead VoIP Engineer to design and build high-performance modules within our Voice platform. You’ll work on the core telephony stack involving signaling, media processing, NAT traversal, and RTP relaying. This is a hands-on execution role ideal for engineers who love building, debugging, and optimizing real-time communication systems. Responsibilities: Implement core voice capabilities using FreeSWITCH, Kamailio, and RTPEngine. Build and optimize SIP call routing logic, RTP media relays, failover mechanisms, and NAT traversal. Develop and manage configurations for scalability, codec negotiation, SIP trunk registration. Implement and test features like call recording, IVR, voicemail, DTMF detection. Monitor live traffic and participate in 24x7 on-call rotation for critical escalations. Collaborate with QA on stress/load testing and with Backend teams on provisioning APIs. Document design decisions, configurations, and troubleshooting runbooks. Troubleshoot and debug production issues, providing timely resolutions. Stay up-to-date with emerging technologies and industry trends, identifying opportunities for innovation and improvement. Collaborate with DevOps teams to ensure smooth deployment and operation of backend services in the AWS cloud environment. Requirements: 8+ years of experience building and operating VoIP systems or CPaaS platforms. Solid expertise with SIP signaling, RTP, and media relay techniques. Strong hands-on with FreeSWITCH, Kamailio/OpenSIPs, RTPEngine. Hands-on experience with Session Border Controller (SBC), Media Servers and WebRTC. Experience in managing telephony infrastructure for uptime, latency, and call quality optimization. Strong systems programming and debugging skills in C/C++. Good scripting/debugging skills (Bash, Python, or Lua for FreeSWITCH modules). Proficiency with diagnostic tools (Homer , VOIPMonitoring, Wireshark, tcpdump etc). Experience working with geographically distributed infrastructure or HA deployments. If you are a talented and motivated Lead VoIP Engineer seeking a challenging opportunity to contribute to the success of our organization, we would love to hear from you. Please submit your resume and portfolio showcasing your relevant work.