Voice AI Agent built by multi-channel engineers

Build voice AI agents for calls, IVR, and in-app voice — low-latency TTS + STT + LLM stacks.

Overview

What Voice AI Agent Development looks like with us

Engineer Master Labs delivers Voice AI Agent for teams that need results in production, not slide decks. We structure work around your existing engineering cadence — Slack or Teams channel, weekly demos, shared backlog. Security and privacy are built in: NDA-first, least-privilege IAM, EU or US data residency, VPC-isolated deployment options. Our engagement models flex to your stage: fixed-scope, staff augmentation, or monthly retainers.

What we deliver

01Analytics: containment rate, handoff rate, CSAT sampling
02Continuous improvement loop — review logs, refine prompts, retrain as needed
03Intent design, conversation flows, and fallback strategies built around real user transcripts
04Multi-channel deployment — WhatsApp, Messenger, Slack, web, voice where needed
05Guardrails: PII redaction, prompt injection defence, content policy enforcement

Use cases

How teams use this

01 / 03

Launch a support chatbot that resolves common queries and hands off cleanly to humans

02 / 03

Build an internal knowledge assistant over your company's Notion / Confluence / Drive

03 / 03

Deploy a sales-qualification bot on your marketing site or WhatsApp

Stack we typically work across

OpenAIClaudeTwilioWhatsApp Business APISlack APILangChain

Trusted by teams worldwide

100+ companiesquietlyrunonsystemswebuilt.

FAQs

Common questions

What containment rates should I expect?

For well-scoped support bots with a clean knowledge base, 40-65% containment is realistic. We baseline on your actual transcripts before quoting numbers.

How do you prevent prompt injection and off-topic responses?

Layered guardrails — system prompt constraints, input filtering, output validation, and a policy layer that refuses unsafe requests. Plus continuous monitoring.

What does pricing look like?

Three models: fixed-scope for clear MVPs, monthly retainer for ongoing engineering, or day-rate staff augmentation. We send a written quote within one week of the scoping call.

How fast can we start?

Most engagements kick off within 5-10 business days of the first discovery call. Scoping takes 3-5 days; paperwork (MSA + SoW + NDA) runs in parallel.

Client voices

Whatpeople who shipped with ussayafterwards.

01 / 04

“Engineer Master Labs built our entire AI call center platform from scratch. Their STT model supporting 100+ languages transformed our business completely!”

Tanya Schumann

CEO PreCallAI

02 / 04

“The automation solutions from Engineer Master Labs helped us scale our revenue operations without hiring additional staff. Their lead generation automation is exceptional.”

Moushami Ganguly

Founder RevenueCaptain

03 / 04

“Their AI engineers delivered a robust call automation system that processes thousands of calls daily. The real-time STT capabilities are game-changing for our business.”

Udit Goenka

CEO QCall.ai

04 / 04

“Engineer Master Labs provided exceptional full-stack development services. Their team's expertise in both frontend and backend technologies delivered exactly what we needed.”

Robert C.

CTO FareOf