Senior Backend Engineer
First seen by Alion on Sep 19, 2026.
Role : Senior Back End Developer - Real-Time Audio & Voice Systems :
About Interactly.ai :
Interactly.ai is transforming healthcare operations with AI-powered automation across scheduling, lab follow-ups, eligibility checks, prior authorization, insurance verification, and more. Our multimodal AI agents work across voice, email, chat, fax, and EHR integrations - improving patient access, reducing staff burden, and accelerating care delivery. We already serve 2,000+ physicians and healthcare providers, delivering measurable outcomes such as 20 - 30% fewer no-shows and thousands of staff hours saved.
Role Overview :
We are seeking a Senior Backend Engineer - Real-Time Audio & Voice Systems to design, build, and operate low-latency, highly reliable voice and audio pipelines that power Interactly.ai's conversational AI platform. This role requires deep hands-on experience with real-time audio streaming, speech-to-text (STT), text-to-speech (TTS), and telephony integrations, using Python and Node.js in production environments. You will play a critical role in building scalable, fault-tolerant systems for high-volume voice interactions.
Key Responsibilities :
- Design, develop, and operate real-time audio processing pipelines for conversational voice agents.
- Build and maintain backend services using Python (FastAPI/async frameworks) and Node.js for low-latency workflows.
- Implement bi-directional audio streaming using WebSockets, WebRTC, or similar protocols.
- Integrate and optimize Speech-to-Text (STT) and Text-to-Speech (TTS) engines (cloud-based or self-hosted).
- Build and maintain telephony integrations (inbound/outbound calling, call routing, call recording, DTMF, conferencing).
- Optimize audio latency, jitter, and reliability across distributed systems.
- Handle high-concurrency workloads and real-time session state management.
- Implement monitoring, logging, and alerting for voice pipelines and call flows.
- Collaborate with AI/LLM teams to integrate speech pipelines with conversational logic.
- Own production deployments, on-call rotations, and incident response for voice systems.
Required Qualifications :
- 4+ years of backend engineering experience, with a strong focus on real-time systems.
- Strong hands-on experience with Python and Node.js in production environments.
- Proven experience building real-time audio or voice applications.
- Deep understanding of STT and TTS pipelines, audio codecs, and streaming concepts.
- Solid experience integrating telephony platforms (inbound/outbound calls, SIP, PSTN).
- Experience with WebSockets, WebRTC, or RTP-based streaming.
- Strong understanding of asynchronous programming and event-driven architectures.
- Experience with Docker and CI/CD pipelines.
- Ability to debug and optimize distributed, latency-sensitive systems.
Nice-to-Have Skills :
- Experience with LLM-powered voice assistants and conversational AI systems.
- Familiarity with audio codecs (Opus, PCM, ?-law) and sampling strategies.
- Experience with cloud infrastructure (AWS/GCP) and autoscaling real-time services.
- Exposure to message queues, Redis, or real-time state stores.
- Prior experience in healthcare, contact centers, or telecom domains.
Why Join Interactly.ai?
- High-impact role : Own mission-critical voice infrastructure at scale.
- Challenging engineering problems : Build low-latency, real-time AI systems.
- Growth-stage startup : Influence architecture and technical direction from early stages.
- Global collaboration : Work closely with India- and US-based teams.
- Career progression : Opportunity to grow into Staff or Principal Engineering roles.
Skills
Python, Node.js, WebRTC, FastAPI, WebSockets, VoIP, SIP, AWS, Audio HAL, IP Telephony