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About the Role

We're hiring a Telephony Infrastructure Engineer to own the voice platform behind Salient's AI agents, including the SIP edge, Asterisk, voice audio and dialing layers, and call servers. This is a hands-on ownership role focused on making the platform reliable, safe to change, and capable of handling significant call volume increases. You will also design and implement customer telephony integrations, making them increasingly self-serve.

Responsibilities

Finish the Asterisk migration, including cutting over customers, trunks, and call flows with no regression, then retiring the legacy path.
Ensure reliability of the voice audio and dialing layers through SLOs, monitoring, incident response, and eliminating recurring failure modes.
Achieve zero-downtime call-server deployments, including draining, graceful shutdown, safe rollout, and rollback without dropping live calls.
Build tools to manage Kamailio and Asterisk reconfiguration without server restarts inside Kubernetes.
Implement backpressure, load shedding, and self-recovery mechanisms for degraded carrier, media, or AI dependencies.
Conduct load testing and capacity planning to validate thousands of concurrent calls and CPS at the SIP edge.
Enhance voice observability with call-quality and platform-health metrics, alerting, runbooks, and postmortems.
Ensure security of the voice edge against scanning, toll fraud, and abuse.
Manage customer telephony integrations, including custom SIP trunks, call transfers, SIP header passing, and API prototypes with new contact-center platforms.
Develop self-serve setup capabilities through productized trunk configurations, validation tooling, and documentation to shorten time to go live.

Requirements

Experience running production voice infrastructure at meaningful scale and being on call for it.
Deep knowledge of SIP, SDP, and RTP, with the ability to debug from traces and pcaps.
Ability to debug EC2/K8s networking issues that result in dead air and develop monitoring and testing plans to minimize dead air.
Understanding of real-time media, WebRTC, and latency budgets.
Experience designing for backpressure, graceful degradation, and safe deploys of stateful services.
Experience building load tests that identified real bottlenecks before customers did.
Ability to write clear design docs, runbooks, and postmortems.
Experience integrating SIP trunks with customer contact centers and carriers, including transfers and header passing.

Skills

SIP
SDP
RTP
EC2
K8s
WebRTC
Kamailio
Asterisk
OpenSIPS
FreeSWITCH
rtpengine
Genesys
Bandwidth
Five9
NICE
Amazon Connect

Location

San Francisco

Work Type

In-person
Full-time

Experience Level

Mid-level
Senior

Benefits

Medical coverage
Dental coverage
Vision coverage
Generous 401(k)
Catered lunches

About the Company

Salient builds AI agents for regulated financial services, automating processes like loan servicing, compliance, and collections.
Backed by a16z and Y Combinator, with $75M raised in Series A funding.
Cash flow positive and profitable, achieving mid eight figure ARR in under two years.
Serving over 20% of the auto lending industry and processing millions of customer calls and transactions daily.
Fully deployed in production with major financial institutions and actively expanding into new financial services segments.
Deeply integrated with customers, owning the full technology stack, and bringing modern AI to regulated industries where precision, reliability, and performance are critical.

Equal Opportunity

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