Description

Design and deliver enterprise-scale Twilio Voice architectures, leading migrations from legacy on-premises telephony systems to cloud-native solutions.

This role is remote.

Responsibilities

• Lead end-to-end migrations from Genesys, Cisco, or Avaya to Twilio, designing target-state architectures for 500+ concurrent call flows.
• Architect complex IVR logic using Twilio Studio and expert-level TwiML, ensuring robust execution under load and handling edge cases like DTMF fallbacks and ASR failures.
• Build secure, idempotent backend services in .NET (C# / ASP.NET Core) with Redis-backed distributed state management for call context across webhook hops.
• Implement carrier redundancy patterns including dual-carrier SIP trunking, geographic failover, and DNS-based routing to ensure high availability.
• Design multi-tenant isolation patterns and HIPAA-compliant audio serving infrastructure using AWS S3 and CloudFront.

Required Skills

• 5+ years of hands-on production experience with Twilio Programmable Voice, Studio, and TwiML at enterprise scale.
• Deep knowledge of Twilio execution model, Studio widget limitations, and when to use Studio vs. custom TwiML.
• Expertise in Twilio Webhook architecture: signature validation, async responses (15-second timeout handling), status/recording callbacks.
• Strong proficiency in .NET (C#), ASP.NET Core, and Twilio SDK for backend service development.
• Experience with Redis for managing call session state (ANI, DNIS, IVR selections) in distributed systems.
• Production experience with Twilio TaskRouter, including Workspace/Worker/Queue configuration and EventStreams integration.
• Solid understanding of SIP protocol, SIP trunking, DNIS/ANI manipulation, and PSTN bridging.
• Experience with AWS audio serving patterns (S3, CloudFront, pre-signed URLs) for IVR prompts.

Preferred Skills

• Experience handling fax tone detection (1100Hz), timeout/no-input retry loops, and multi-modal fallbacks (speech to DTMF).
• Familiarity with clinical call profile latency management and language-specific grammar considerations for ASR.

Key Skills

Education

Any Gradute