Voice AI Infrastructure and Integration Engineer (Vapi)

About Firstsource Firstsource Solutions Limited, an RP-Sanjiv Goenka Group company (NSE: FSL, BSE: 532809, Reuters: FISO.BO, Bloomberg: FSOL:IN), is a specialized global business process services partner, providing transformational solutions and services spanning the customer lifecycle across Healthcare, Banking and Financial Services, Communications, Media and Technology, Retail, and other diverse industries. With an established presence in the US, the UK, India, Mexico, Australia, South Africa, and the Philippines, we make it happen for our clients, solving their biggest challenges with hyper-focused, domain-centered teams and cutting-edge tech, data, and analytics. Our real-world practitioners work collaboratively to deliver future-focused outcomes.

Voice AI Infrastructure & Integration Engineer Experience: 6–10 years Location: India (Hybrid)

Role Overview We are seeking an experienced Voice AI Infrastructure & Integration Engineer to own the platform reliability, observability, and telephony integration for our LLM-native voice agent. You will build the monitoring and tracing stack that gives full visibility into every call, own the call recording pipeline that satisfies FDCPA compliance, scale the orchestration runtime across container infrastructure, and integrate with telephony providers for SIP trunking, call routing, and audio stream handoff.

Key Responsibilities Observability, Logging & Monitoring
- Design and implement the full-stack observability pipeline using OpenTelemetry, Datadog, and ELK Stack — distributed traces, structured logs, and real-time metrics across every layer.
- Instrument the voice pipeline to emit per-turn telemetry: STT latency, LLM inference time, guardrail check duration, TTS first-chunk latency, and total round-trip time.
- Build alerting rules for latency SLA breaches, guardrail trigger rate spikes, STT/TTS error rates, and telephony drop rates.
- Create operational dashboards for real-time call volume, concurrent sessions, an Apply on Kit Job: kitjob.in/job/4naapz