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I build and tune voice AI agents end-to-end—from prompt engineering and conversation design to STT/LLM/TTS tuning—so the agent sounds like a person on real calls. I instrument, test, and iterate until performance is reliable under production conditions. Since 2021 I’ve shipped 100+ projects into live environments using Retell AI, ElevenLabs, and Deepgram, and I write custom code (when prompting runs out) plus detailed documentation so the next agent is faster to build and easier to QA.…I build and tune voice AI agents end-to-end—from prompt engineering and conversation design to STT/LLM/TTS tuning—so the agent sounds like a person on real calls. I instrument, test, and iterate until performance is reliable under production conditions. Since 2021 I’ve shipped 100+ projects into live environments using Retell AI, ElevenLabs, and Deepgram, and I write custom code (when prompting runs out) plus detailed documentation so the next agent is faster to build and easier to QA.

Tanveer Hussain

Marketing Automation Specialist, Full Stack Developer, Back-End Developer, +7

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I build and tune voice AI agents end-to-end—from prompt engineering and conversation design to STT/LLM/TTS tuning—so the agent sounds like a person on real calls. I instrument, test, and iterate until performance is reliable under production conditions. Since 2021 I’ve shipped 100+ projects into live environments using Retell AI, ElevenLabs, and Deepgram, and I write custom code (when prompting runs out) plus detailed documentation so the next agent is faster to build and easier to QA.…I build and tune voice AI agents end-to-end—from prompt engineering and conversation design to STT/LLM/TTS tuning—so the agent sounds like a person on real calls. I instrument, test, and iterate until performance is reliable under production conditions. Since 2021 I’ve shipped 100+ projects into live environments using Retell AI, ElevenLabs, and Deepgram, and I write custom code (when prompting runs out) plus detailed documentation so the next agent is faster to build and easier to QA.

Available to hire

I build and tune voice AI agents end-to-end—from prompt engineering and conversation design to STT/LLM/TTS tuning—so the agent sounds like a person on real calls. I instrument, test, and iterate until performance is reliable under production conditions.

Since 2021 I’ve shipped 100+ projects into live environments using Retell AI, ElevenLabs, and Deepgram, and I write custom code (when prompting runs out) plus detailed documentation so the next agent is faster to build and easier to QA.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

German

Fluent

French

Fluent

English

Fluent

Italian

Fluent

Dutch

Fluent

Urdu

Fluent

Work Experience

AI Automation Engineer at self employed

July 18, 2022 - Present

Doing Freelancing since 2022

AI & Voice Engineer (Independent) at Upwork

January 1, 2021 - Present

Built and refined voice agent prompts and dialogue flows for inbound calling scenarios, including interruption handling, turn-taking, pacing, and brand voice alignment. Tuned the full STT/LLM/TTS chain across Retell AI, ElevenLabs, and Deepgram (e.g., diagnosing and reducing end-to-end latency from ~12s to ~1.8s). Owned QA by creating test cases from real conversation scenarios, adding structured output validation and grounding checks to prevent unverified answers, and running A/B comparisons across Claude, GPT, and Gemini. Implemented custom tool/function calling via Python/FastAPI and Node.js to perform in-call actions (lookups, scheduling, validation, CRM updates) integrated with third-party REST APIs. Built retrieval/knowledge bases using pgvector for grounded responses from client materials (scripts, FAQs, documentation). Documented reusable prompt patterns and troubleshooting notes, and fed platform limitations back to vendors via tickets with suggested workarounds. Developed pr