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Telephony Infrastructure Engineer

Salient· Engineering
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SF Headquarters$200k - $300kFull-timePosted 3w ago

About the role

Telephony Infrastructure Engineer responsible for owning Salient's voice platform (SIP edge, Asterisk, voice audio and dialing layers, and call servers) to support AI agents in regulated financial services. Hands-on ownership, reliability, scalability, and customer telephony integrations with self-serve setup.

Responsibilities

  • Finishing the Asterisk migration: cutting over remaining customers, trunks, and call flows with no regression, then retiring the legacy path.
  • Reliability of the voice audio and dialing layers: SLOs, monitoring, incident response, and eliminating recurring failure modes.
  • Zero-downtime call-server deployments: draining, graceful shutdown, safe rollout, and rollback without dropping live calls.
  • Building tools to manage Kamailio and Asterisk reconfiguration without server restarts inside Kubernetes
  • Backpressure, load shedding, and self-recovery when carriers, media, or AI dependencies degrade.
  • Load testing and capacity planning that validates thousands of concurrent calls and CPS at the SIP edge.
  • Voice observability: call-quality and platform-health metrics, alerting, runbooks, and postmortems.
  • Security of the voice edge against scanning, toll fraud, and abuse.
  • Customer telephony integrations: custom SIP trunks (e.g., Genesys, Bandwidth), call transfers, SIP header passing, and API prototypes with new contact-center platforms.
  • Self-serve setup: productized trunk configurations, validation tooling, and docs that shorten time to go live.

Qualifications

  • You've run production voice infrastructure at meaningful scale and have been on call for it.
  • You know SIP, SDP, and RTP deeply and debug from traces and pcaps.
  • You can debug EC2/K8s networking issues that result in deadair—and develop monitoring and testing plans to minimize deadair.
  • You understand real-time media, WebRTC, and latency budgets.
  • You design for backpressure, graceful degradation, and safe deploys of stateful services.
  • You've built load tests that found real bottlenecks before customers did.
  • You write clear design docs, runbooks, and postmortems.
  • You've integrated SIP trunks with customer contact centers and carriers, including transfers and header passing.

Skills

Required:Production voice infrastructure at scaleSIP, SDP, RTPEC2/Kubernetes networkingReal-time media, WebRTCBackpressure and safe deploysLoad testingDesign docs and runbooksSIP trunk integration

Benefits

  • medical, dental, and vision coverage
  • generous 401(k)
  • catered lunches
Last updated Sep 30, 2026. Interested? Apply on the company site.
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About Salient

AI Servicing for Auto Lenders

Salient is an AI workflow automation tool for lenders. We're working with the largest auto lenders in America and are hiring!

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