Voice Infrastructure Engineer

About the Role
We're building the future of contact center communications, and we're looking for an exceptional Voice Infrastructure Engineer to architect and implement enterprise-grade voice technologies that will power thousands of customer interactions daily.
If you're passionate about real-time communications , VoIP , and creating seamless voice experiences at scale, this is your opportunity to make a massive impact.
What You'll Build
You'll be the technical architect behind the complete voice infrastructure stack, including:
Intelligent IVR Systems
Conversational AI-powered self-service using modern ASR/NLU/TTS engines
Integration with Deepgram Nova-2, Claude Sonnet 4, ElevenLabs Turbo
Dynamic call flow orchestration with 60-80% containment rates
Predictive Dialer Platform
ML-optimized pacing algorithms for maximum agent productivity
Advanced Call Progress Analysis (CPA) with 95%+ accuracy
TCPA-compliant outbound calling with real-time abandonment rate control
SIP Trunking & WebRTC Infrastructure
Multi-provider SIP trunk architecture (Twilio, Bandwidth, Telnyx)
Session Border Controller (SBC) implementation for security and QoS
Browser-based WebRTC softphones for agents
TLS/SRTP encryption and fraud prevention
Voice Quality Optimization
Real-time monitoring dashboards (MOS, latency, jitter, packet loss)
Codec negotiation and transcoding (G.711, G.729, Opus)
RTCP analysis and quality alerting systems
What We're Looking For
Technical Expertise:
Deep knowledge of SIP protocol , RTP/SRTP , and VoIP fundamentals
Experience with WebRTC and real-time communications
Proficiency in Node.js/TypeScript or Go/Rust for high-performance systems
Hands-on experience with Twilio, Bandwidth, or similar SIP trunk providers
Understanding of audio codecs, QoS, and network protocols
Contact Center Technologies:
Experience building or implementing IVR systems
Knowledge of predictive/progressive dialers and pacing algorithms
Understanding of ASR, NLU, and TTS technologies (Deepgram, AssemblyAI, ElevenLabs)
Familiarity with call routing , skills-based distribution, and ACD systems
Architecture & Scale:
Proven ability to design highly available, fault-tolerant voice systems
Experience with multi-region deployment and redundancy strategies
Knowledge of PostgreSQL/TimescaleDB , Redis , and distributed systems
Cloud infrastructure experience (AWS, GCP, or Azure)
Compliance & Security:
Understanding of TCPA, FCC regulations , and DNC requirements
Experience implementing TLS/SRTP encryption and security best practices
Knowledge of fraud detection and prevention mechanisms
Bonus Points
Experience with ML/AI integration for voice analytics and optimization
Contributions to open-source telephony projects (FreeSWITCH, Asterisk, Janus)
Background in speech analytics , sentiment analysis, or voice biometrics
Experience with Homer SIP capture , Prometheus/Grafana , or voice monitoring tools
Knowledge of STIR/SHAKEN and robocall mitigation
What You'll Get
✅ Autonomy & Ownership - You'll architect and build our voice infrastructure from the foundation up
✅ Cutting-Edge Tech Stack - Work with the latest in AI, voice, and real-time communications
✅ Impact at Scale - Your work will power millions of customer conversations
✅ Collaborative Team - Work alongside talented engineers who value innovation and quality
✅ Growth & Learning - Exposure to emerging technologies in conversational AI and voice automation
✅ Competitive Compensation - comprehensive benefits, and flexible work arrangements
How to Apply
If you're excited about building the future of voice communications and want to work on challenging, impactful problems, we'd love to hear from you!
Send us:
Your resume highlighting relevant VoIP/telephony experience
A brief note about the most complex voice system you've built
Links to any public projects or GitHub repos (if available)
Email: careers@simetrix-solutions.com