Lead Voice Infrastructure Engineer

Stuut is transforming accounts receivable for B2B companies, making collections smarter and faster. They are hiring a Senior Telephony Engineer to build the foundation for AI-driven voice, focusing on designing and operating telephony infrastructure for production phone interactions at scale.

Responsibilities:

• Design, build, and operate telephony services that manage phone numbers, SIP trunks, carrier integrations, and call routing at scale
• Develop reliable signaling and media systems that bridge traditional telephony with realtime voice infrastructure and AI pipelines
• Build and improve core voice workflows: outbound calling, inbound routing, warm transfer, voicemail handling, DTMF interaction, and human handoff
• Work closely with speech and AI systems across STT, TTS, turn-taking, interruption handling, and agent orchestration
• Improve call quality, latency, reliability, and debuggability across the voice stack
• Build internal APIs and platform primitives that make voice capabilities accessible to product and engineering teams
• Instrument voice workflows so we can measure business outcomes: answer rates, transfer success, voicemail outcomes, and resolution rates
• Work with carriers and external vendors to expand coverage, improve routing performance, and handle regulatory or operational requirements
• Dive into production issues when needed, including packet captures, signaling traces, vendor debugging, and incident response