Senior Machine Learning Engineer II - SIP Telephony at Capitalrx

Capitalrx

Remote·2d ago

SeniorFull-timePythonRustAWSAIML

Salary Range

$132,600 - $179,400 /year

Estimated

This salary is estimated based on similar roles. The actual salary may vary.

About the Role

We are looking for a Telephony Infrastructure Engineer to join our team at Judi Health. This role focuses on building cutting-edge voice AI infrastructure that powers our healthcare solutions.

Key Responsibilities

→Design, build, and operate greenfield SIP trunking infrastructure connecting carrier-grade telephony to our internal voice AI platform.
→Architect and implement real-time bidirectional audio streaming pipelines to support our ECS-based voice stack.
→Design autoscaling strategies for stateful, connection-based workloads, enabling the platform to scale dynamically based on connection ingress and concurrent call volume.
→Implement call routing, inbound/outbound dialing flows, and media transport (RTP/SRTP).
→Integrate with Amazon Connect to bridge carrier connectivity into our custom infrastructure.
→Collaborate with ML engineers, product managers, and other stakeholders to ensure the telephony layer meets the needs of our voice AI systems.
→Ensure outbound dialing infrastructure complies with TCPA regulations and supports STIR/SHAKEN attestation.

Requirements

✓Minimum 6+ years of experience in software engineering with a strong focus on real-time communication infrastructure, telephony systems, or voice platforms.
✓Deep hands-on experience with SIP protocol, including trunking, signaling flows, SDP negotiation, and RTP/SRTP media transport.
✓Experience standing up and managing SIP trunks with cloud or carrier providers (Twilio, Bandwidth, Vonage, Telnyx, or similar).
✓Experience building real-time bidirectional audio streaming infrastructure.
✓Proficiency with AWS infrastructure, including ECS (Fargate or EC2-backed), ALB/NLB, Kinesis, Lambda, and CloudWatch.
✓Experience designing autoscaling strategies for stateful connection-based workloads (session scaling, concurrent call capacity planning).
✓Experience with outbound dialing infrastructure, including familiarity with TCPA compliance and STIR/SHAKEN attestation.
✓Strong proficiency in Python. Familiarity with C for working with open source telephony projects (FreeSWITCH, Kamailio, PJSIP, etc.) and Rust is a plus.