Senior Machine Learning Engineer II - SIP Telephony

About Judi Health

Judi Health is an enterprise health technology company providing a comprehensive suite of solutions for employers and health plans, including:

• Capital Rx, a public benefit corporation delivering full-service pharmacy benefit management (PBM) solutions to self-insured employers,

• Judi Health™, which offers full-service health benefit management solutions to employers, TPAs, and health plans, and

• Judi®, the industry’s leading proprietary Enterprise Health Platform (EHP), which consolidates all claim administration-related workflows in one scalable, secure platform.

Together with our clients, we’re rebuilding trust in healthcare in the U.S. and deploying the infrastructure we need for the care we deserve. To learn more, visit www.judi.health.

Position Summary:

Join our mission to bring cutting-edge voice AI into healthcare as a Senior Telephony Infrastructure Engineer. We are looking for an experienced engineer with deep expertise in SIP, real-time communications, and cloud telephony infrastructure to build the foundational voice platform that powers our AI-driven products.

In this role you will be responsible for designing and building greenfield telephony infrastructure, including SIP trunking, real-time audio streaming, and call routing, to deliver a programmable voice platform on top of Amazon Connect and our ECS-based voice stack. You will own the infrastructure layer from carrier connectivity through to the handoff where our voice AI agents take over. The ideal candidate has stood up production telephony systems, understands SIP inside and out, and is excited to build scalable real-time infrastructure in a healthcare setting. Most importantly, we are a mission-oriented, high-growth startup and we are looking for folks that are excited to be part of our journey to make lasting impact towards transforming healthcare.

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.

Required Qualifications:

• 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.

Preferred Qualifications:

• Experience with Amazon Connect, including Contact Flows, APIs, Kinesis Video Streams integration, and Lambda hooks.

• Experience bridging carrier-grade telephony into custom media pipelines.

• Familiarity with WebRTC (STUN/TURN/ICE) and browser-based softphone implementations.

• Experience building multi-tenant programmable voice platforms or internal telephony PaaS.

• Familiarity with voice-specific audio preprocessing, including VAD, echo cancellation, AGC, and noise suppression.

• Exposure to ASR/TTS integration in real-time call flows (streaming partial results, endpointing, barge-in).

• Interest in ML/AI and conversational AI systems.

Salary Range
$180,000—$210,000 USD

All employees are responsible for adherence to the Capital Rx Code of Conduct including the reporting of non-compliance. This position description is designed to be flexible, allowing management the opportunity to assign or reassign duties and responsibilities as needed to best meet organizational goals.

Judi Health values a diverse workplace and celebrates the diversity that each employee brings to the table. We are proud to provide equal employment opportunities to all employees and applicants for employment and prohibit discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, medical condition, genetic information, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

By submitting an application, you agree to the retention of your personal data for consideration for a future position at Judi Health. More details about Judi Health's privacy practices can be found at https://www.judi.health/legal/privacy-policy.