Voice Infrastructure Engineer

Simetrix SolutionsKolkata, IN

3 days ago

Job description

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

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Infrastructure Engineer • Kolkata, IN

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