Senior Backend Engineer (WebRTC)

About Telnyx

Telnyx is an industry leader building the future of global connectivity through a private, global, multi-cloud IP network and hyperlocal edge technology. They focus on transforming antiquated systems, automating manual processes, and solving real-world problems with innovative connectivity solutions. Telnyx is financially stable, profitable, and fosters an environment of continuous learning and growth.

Job Overview

Telnyx is seeking a Senior Backend Engineer to join their WebRTC team. The role involves designing, building, maintaining, and operating backend services that support their real-time communications and Voice SDK platform. These services include authentication, token management, push notifications, proxying, RTC DNS, and diagnostic logging.

You will work closely with mobile and JavaScript SDK engineers, taking ownership of backend systems from design and implementation through deployment, monitoring, scaling, and production support. This is a systems-focused role for someone passionate about distributed production services, solving reliability problems, and understanding real-world communication systems.

What You’ll Do

• Design, build, maintain, and operate backend services supporting WebRTC and Voice SDK products.
• Take ownership of backend systems including Voice SDK proxy services, authentication and token services, push notification services, RTC DNS, and diagnostic logging.
• Improve the reliability, scalability, and maintainability of customer-facing backend services.
• Improve connection setup, authentication flows, routing, and service behavior across real-time communication workloads.
• Build and improve observability through logs, metrics, dashboards, alerts, and operational tooling.
• Improve visibility into push notification delivery and make integrations with services like APNs and FCM easier to monitor and troubleshoot.
• Diagnose production issues across backend services, networking layers, and client connectivity.
• Improve deployment processes, rollout safety, and production readiness for distributed services.
• Turn recurring customer and operational issues into durable engineering improvements.
• Collaborate closely with mobile, JavaScript, infrastructure, and other engineering teams to improve end-to-end reliability.
• Help shape the architecture and technical direction of backend systems supporting WebRTC products.

Qualifications

• Strong professional experience building and operating backend systems in production.
• Strong experience working with distributed systems and service-oriented architectures.
• Experience with Elixir or Erlang, or strong backend engineering experience with the ability to ramp up quickly in Elixir.
• Experience building or operating real-time, low-latency, or connection-oriented systems.
• Strong understanding of backend fundamentals such as authentication, service communication, session lifecycle, reliability, and failure recovery.
• Experience owning services throughout their lifecycle, including design, development, deployment, monitoring, troubleshooting, and scaling.
• Experience with Kubernetes, containers, CI/CD, and modern production infrastructure.
• A strong observability mindset, including experience with logging, metrics, dashboards, alerting, and root-cause analysis.
• Good understanding of networking fundamentals and the ability to troubleshoot issues across software, networking, and infrastructure boundaries.
• Strong communication skills and the ability to collaborate effectively with engineers across different parts of the stack.

Nice to Have

• Experience with WebRTC, VoIP, voice/video communications, or other real-time communication systems.
• Experience with WebSockets or other persistent connection technologies.
• Experience working with push notification infrastructure such as APNs or FCM.
• Experience with DNS, edge routing, service discovery, or globally distributed systems.
• Experience building internal diagnostic, observability, or troubleshooting tools.
• Experience building backend services that support mobile or JavaScript SDKs.