Our stack. Published.
Most agencies won’t tell you what runs under the hood. We will. Here’s every verified integration partner we use to build, deploy, and operate ZentroTECH lead engines for Indian SMBs.
Meta WhatsApp Business
WhatsApp Business API · BSP architecture
Meta-approved Business Solution Provider architecture. Wholesale pricing: ₹0.86 per marketing message · ₹0.13 per utility message — billed direct to your Meta wallet, no markup from us.
Visit Meta WhatsApp Business →Bolna AI
Voice agent infrastructure · inbound + outbound
Production-grade voice agent runtime used for our missed-call recovery, lead qualification, and invoice-chase flows. Sub-second response, Indian carrier-grade telephony.
Visit Bolna AI →Sarvam AI
Indian-language LLM + voice (11 languages)
Kannada, Hindi, Tamil, Telugu, Malayalam, Marathi, Bengali, Gujarati, Punjabi, Odia, and English. The reason our Kannada voice agents sound like Bangaloreans, not translations.
Visit Sarvam AI →Razorpay
Payment recovery + reconciliation
Smart-collect, payment links, and webhook events wired into our 6-stage recovery cadence. Auto-pauses the moment payment lands. Standard Razorpay MDR applies — pass-through, no markup.
Visit Razorpay →Next.js + Vercel
Lead-engine site runtime + edge hosting
Every ZentroTECH site is built on Next.js 16 and shipped on Vercel’s edge network. Core Web Vitals in the green by default, global CDN, automatic image optimization — the table stakes most Indian agencies skip.
Visit Next.js + Vercel →Google Cloud + Microsoft Azure
Voice + AI infra fallback · enterprise-grade
Where India-first vendors don’t cover a use case, we fall back to GCP Vertex AI / Azure OpenAI / Azure Communication Services. Redundancy you can’t buy from a single-vendor agency.
Visit Google Cloud + Microsoft Azure →We don’t sell their software.
We integrate them into systems we build for you, so you own the outcome.
You don’t need nine SaaS dashboards. You need one team that knows which tools to wire together for your specific Bangalore SMB problem — missed calls in Kannada, leads sitting cold for 11 hours, invoices unpaid past 30 days — and the engineering discipline to make the integration boring and reliable.
The accounts stay in your name. The data stays yours. The phone number is yours. The WhatsApp Business Account is yours. If you ever fire ZentroTECH, the stack keeps running and you walk away with everything we built. That’s the difference between an integration partner and a lock-in vendor.
Want us to wire this stack into your business?
Send us your current setup — what you use today for site, WhatsApp, calls, payments — and we’ll map a 21-day migration plan. No charge for the plan.
See our published pricing and 21-day process.