Voice AI Developer Staff Augmentation - Hire Dedicated LiveKit, VAPI & LLM Engineers
Staff augmentation for Voice AI and conversational AI projects. Dedicated LiveKit Agents, VAPI, Whisper ASR, GPT-4, and ElevenLabs TTS engineers. Starting from $25/hr with 48-hour onboarding. Full-stack voice AI experts for STT→LLM→TTS pipelines.
What is Voice AI staff augmentation?
Voice AI staff augmentation provides access to full-stack conversational AI engineers who design and build STT→LLM→TTS voice bot systems. Teams include LiveKit Agents, VAPI platform, and LLM integration specialists for customer service bots, healthcare voice agents, and outbound calling systems.
Why use staff augmentation for Voice AI?
Voice AI requires expertise across multiple domains: speech recognition, LLM integration, text-to-speech, real-time orchestration, and often PSTN integration. Staff augmentation lets you assemble specialized teams without long hiring cycles, providing access to top 3% practitioners in this rapidly evolving field.
Voice AI Developer Staff Augmentation
Expert LiveKit, VAPI, and full-stack Voice AI engineers. Build conversational AI systems from $25/hr. 48-hour onboarding.
Voice AI Technology Stack
| Layer | Technologies | CelloIP Expertise |
|---|---|---|
| STT (Speech-to-Text) | Deepgram Nova-2, Whisper Large V3, Google STT | Production streaming pipelines, real-time accuracy, fallback handling |
| LLM (Large Language Model) | GPT-4o, Claude 3.5, Llama 3 (self-host) | Fine-tuning, RAG, prompt engineering, function calling |
| TTS (Text-to-Speech) | ElevenLabs, Cartesia, Azure Neural Voices | Streaming TTS, low-latency delivery, voice cloning |
| Orchestration | LiveKit Agents SDK, VAPI, Retell AI | Full pipeline integration, real-time control, agent management |
| SIP Integration | Asterisk, FreeSWITCH, OpenSIPS | PSTN-connected voice bots, carrier interconnect, SRTP |
Available Voice AI Roles
Voice AI Architect
$48–55/hrFull STT→LLM→TTS pipeline design, LiveKit Agents, VAPI, system design
Senior architect for complex voice AI systems and multi-agent orchestration
LiveKit Agent Developer
$35–48/hrLiveKit Agents SDK, real-time audio, Python/Node.js, agent logic
Expert in building and deploying LiveKit voice agents with custom logic
LLM Integration Engineer
$44–50/hrGPT-4/Claude/Llama integration, prompt engineering, fine-tuning, RAG
Specialist in LLM pipelines, context management, and conversation design
STT/TTS Specialist
$30–42/hrDeepgram, Whisper, ElevenLabs, Cartesia, streaming audio, low-latency
Expert in speech recognition and synthesis optimization
SIP + Voice AI Integration Engineer
$46–52/hrVAPI SIP trunking, Asterisk/FreeSWITCH integration, PSTN bridging
Specialist in connecting voice AI agents to legacy telecom infrastructure
Related Hiring Pages
Common Use Cases
AI Customer Service Bot
24/7 voice-based customer support handling inquiries, escalations, and callback scheduling
Healthcare Voice Agent (HIPAA)
Patient appointment scheduling, medication reminders, and symptom screening with full HIPAA compliance
Outbound Sales Dialler
AI-powered outbound calling for lead qualification, follow-ups, and customer re-engagement
Voice-Enabled IVR Replacement
Intelligent voice menu replacing traditional IVR systems with natural conversation
Frequently Asked Questions
What skills do Voice AI developers need?
Full-stack Voice AI requires expertise across STT (Whisper, Deepgram), LLM integration (GPT-4, Claude), TTS (ElevenLabs, Cartesia), and orchestration (LiveKit Agents, VAPI). Our engineers understand audio processing, low-latency optimization, and conversation design patterns.
What's the difference between LiveKit and VAPI?
LiveKit Agents SDK is open-source for fully custom agents with granular control. VAPI is a managed platform with pre-built agent templates. LiveKit suits complex custom agents; VAPI for rapid MVP deployment. We work with both.
Can Voice AI integrate with PSTN?
Yes. Via SIP integration with Asterisk/FreeSWITCH or VAPI SIP trunking, voice bots can handle incoming PSTN calls and make outbound calls. This bridges browser agents to traditional phone infrastructure.
What's the latency for STT→LLM→TTS?
End-to-end latency is typically 800ms–2s: STT (100–400ms), LLM (500–800ms), TTS (200ms). Real-time optimization requires careful provider selection, server colocation, and streaming protocols.
Can Voice AI be HIPAA compliant?
Yes. Requires BAA agreements with providers, encrypted audio storage, audit logging, and secure infrastructure. We've deployed HIPAA-compliant voice bots for healthcare providers and telehealth platforms.