Sasi Varunan

CEO

Bengaluru, Karnataka, India14 yrs 9 mos experience

Most Likely To SwitchHighly Stable

Key Highlights

14+ years in Voice AI and Real-Time Communications.
Expert in building resilient, low-latency voice systems.
Proficient in VoIP protocols and observability strategies.

Stackforce AI infers this person is a SaaS-focused Voice AI Architect with extensive experience in real-time communications.

Contact

Skills

Core Skills

Voice AiVoipVoice EngineeringWebrtcCloud Gaming

Other Skills

ASRAngularJSAsteriskDockerFreeswitchGPU streamingJavaScriptKaiosKamailioKubernetesNode.jsSCTPSIPSTTTTS

About

Voice AI Architect | 14 Yrs in Real-Time Comms ✦ SIP ✦ ASR ✦ LLM ✦ TTS ✦ Observability ✦ Kubernetes/On-Prem Deployments With 14+ years of deep engineering experience, I specialise in building end-to-end Agentic Voice AI systems that are production-grade, real-time optimised, and observability-rich. From SIP-level call routing and SBCs to weaving together ASR, LLM, and TTS pipelines, I build systems that handle millions of sessions with sub-second latency. I’ve worked extensively with SIP proxys, media servers, audio transcoding, TLS/SRTP, and WebRTC clients, deploying them across Kubernetes, Docker Swarm, and bare-metal on-prem environments. Resilience is non-negotiable. I design voice platforms with built-in failover, fallback strategies, and fine-grained observability at every hop — from initial packet to final spoken word.

Experience

Yellow.ai

2 roles

Principal Engineer of Voice Product

Promoted

May 2023 – Present · 2 yrs 10 mos · Bengaluru, Karnataka, India

At my current role, I lead the architecture, development, and scaling of VoIP-powered Agentic Voice AI systems — tightly optimized for real-world use cases, resilience, and ultra-low latency.
🔹 Key Responsibilities 🔹
🔹 VoIP Telephony Solutions
Designed and implemented VoIP media infrastructure, including
Media Servers (including WebSocket-based audio streaming)
Stateful and Stateless SIP Proxies
Registrars, Authentication Modules, and Location Servers
Enabled secure, scalable SIP-based communication with SRTP/TLS, NAT traversal, and load-aware routing.
🔹 Agentic Voice AI Bot Architecture
🗣️ ASR (Speech Recognition)
Architected ASR systems with advanced customization for:
Alpha-numeric parsing, domain-specific vocabulary, multilingual support, human name recognition, and boosted keyword phrasing
Handled end-of-thought detection, sentiment awareness, VAD (Voice Activity Detection), and cost-saving strategies (like burst detection & segmentation tuning)
🔊 TTS (Text to Speech)
Integrated TTS engines that prioritize:
Low-latency and natural-sounding voice quality
Smart caching strategies for repeat prompts — maintaining variation while reducing compute load
🧠 LLM (Large Language Models)
Built custom workflows to:
Filter LLM stream output using meaningful delimiters
Maintain contextual memory across workflow switches
Enhance TTS voice mapping for better expressiveness and relevance
📈 Observability
Built end-to-end observability into the voice stack:
Latency tracking and performance monitoring at every hop (ASR → LLM → TTS)
Real-time alerts, log tracing, and custom metrics dashboards
🔹 Scaling & Reliability
Architected High Availability (HA) and auto-scaling infrastructure for VoIP media systems
Voice bot services using Docker and Kubernetes

Voice engineeringVoice AIASRSTTTTSVoIP+2

SDE 3 | Voice Engineering

Nov 2021 – Apr 2023 · 1 yr 5 mos · Bengaluru, Karnataka, India

golangNode.jsKubernetesdockerWebrtcKamailio+4

Jio

Senior Manager - JioGames

Nov 2017 – Nov 2021 · 4 yrs · Bangalore

Led code development, drove projects, and mentored team members within the Jio Games KaiOS/Firefox app development team.
Developed an SIP/SCTP-based WebRTC Multiplayer SDK.
Conducted R&D and delivered end-to-end MVP for cloud game streaming solutions.
Designed and implemented GPU machine-to-user browser streaming (peer-to-peer), allowing users to launch AAA games from the cloud directly within their personal browser.

Plivo

Sr Webrtc Engineer

Dec 2016 – Nov 2017 · 11 mos · Bangalore

Led the development of a WebRTC and SIP-based plugin for browsers, a Chrome extension, and an Electron app.
Played a key role in enabling the creation of a full-featured web phone