Open to select roles · US / EU teams
Hire anAI Voice Engineer
Hire an AI Voice Engineer who has already taken agents from first commit to paying customers: architecture, model routing, telephony, and the billing those calls produce.
Hemendra Tripathi · Technical Lead · AI Engineer · Udaipur, IN · US / EU teams
- Paying customers
- 1,500+
- LLM inference cost
- −20%
- Voice TTFT (typical)
- ~420ms
- Billing disputes since launch
- ~0
What this hire is for
Technical lead
Own architecture, hiring, vendor spend, and the roadmap. Reporting line to founder or CTO. You want someone who has already done this on a voice product in production.
AI Voice Engineer
Real-time agents on Twilio, Telnyx, or SIP. Latency budgets, failover, STT/TTS vendor choices, and complexity-aware LLM routing — not a chatbot wrapped in a phone number.
Select freelance
Bounded work: voice pipeline, usage-based billing, or a multi-LLM product. US and EU-friendly hours. Typical reply within 24 hours.
Proof, not a deck
The Callin.io case study is the résumé: 1,500+ paying customers, ~20% lower LLM inference cost, typical voice TTFT near 420ms, and billing disputes near zero after launch. Read it before we talk.
Callin.io voice AI case study →Not a fit
- Prompt-only chatbot wrappers with no telephony
- Staff-aug that needs a body in a seat tomorrow
- Unpaid test projects or speculative equity-only gigs
FAQ
What is an AI Voice Engineer?
An AI Voice Engineer designs and ships real-time voice agents: telephony, model routing, latency, and billing. Hemendra Tripathi is an AI Voice Engineer and technical lead in Udaipur. At Callin.io he scaled multi-LLM voice agents past 1,500 paying customers and cut inference cost about 20%.
How do I hire an AI Voice Engineer like Hemendra?
Book a 20-minute call at cal.com/hemendratripathi/hiring-freelance. Timezone is converted for you. Or email hemendratripathi880@gmail.com. He is open to technical-lead, AI engineer, and senior full-stack roles, plus select freelance. Expect a reply within 24 hours, plus the Callin.io case study.
Is Hemendra available for freelance or full-time AI engineering roles?
Yes. He is open to technical-lead, AI engineer, and senior full-stack roles, and select freelance focused on voice AI, multi-LLM products, or usage-based billing. Book 20 minutes at cal.com/hemendratripathi/hiring-freelance or email; he typically replies within 24 hours and can share the Callin.io case study and résumé.
Next step
Book 20 minutes.
Timezone is converted for you. Replies within 24 hours. Bring the problem, not a spec. The case study and résumé are ready if you want them first.