Full-Stack Software Engineer VOIP & Twilio Infrastructure (Back End)

We are building a cloud VoIP + call-center platform for a restaurant group with multiple locations and a centralized catering call center.
Phase 1 MVP includes Twilio Voice (inbound/outbound), TaskRouter queues & routing, voicemail, call recordings, browser softphone, admin dashboards,
and multi-location routing. Phase 2 includes the visual IVR flow builder.

Responsibilities

• Architect and implement Node.js/TypeScript backend powering real-time telephony and routing.
• Integrate deeply with Twilio Voice API, TaskRouter, and TwiML webhooks.
• Develop REST and WebSocket APIs for the browser softphone and admin dashboards.
• Build ACD routing logic, overflow rules, and after-hours routing.
• Implement voicemail and call recording pipelines; handle secure audio storage (S3/GCP).
• Own multi-location logic: hours, numbers, E911 profiles, routing rules, menus.
• Implement OAuth/JWT authentication and role-based access control.
• Handle Twilio event callbacks, including busy/no-answer/timeouts.
• Implement compliance requirements (STIR/SHAKEN, E911 verification, recording consent).
• Collaborate with frontend-focused engineer on shared API contracts and TypeScript models.
• Deploy and monitor services using Docker, CI/CD, and cloud infrastructure.
• Implement logging, observability, and automated call-flow and webhook tests.

Must-Have Requirements

• Strong hands-on experience with Twilio Voice API and TwiML call control.
• Experience with Twilio TaskRouter (queues, workers, reservations, workflows).
• 3+ years of Node.js and TypeScript experience.
• Deep understanding of VoIP systems: SIP, RTP, WebRTC signaling, DTMF.
• Experience with webhooks, async event-driven systems, and distributed flows.
• Database experience with PostgreSQL and ORM tools such as Prisma.
• Experience with AWS S3 or GCP Cloud Storage for audio retention.
• Knowledge of E911, STIR/SHAKEN, and call-recording legal requirements.
• Ability to build testable, observable, reliable backend services.
• Strong communication and system design skills.