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ANDROIDHASSAN/README.md
Hassan Kazi. Voice AI Engineer: real-time voice agents and Indic speech.
Open to work: remote Voice AI and Agents Engineer roles. Real-time voice agents, LiveKit and Pipecat, Python and TypeScript, Indic speech.
Open to remote Voice AI roles; 1,000+ concurrent AI interviews; 13 merged OSS fixes; Indic speech; 7 papers rebuilt; 9x hackathon winner

Hire me LinkedIn Portfolio 13 merged open-source PRs LeetCode CodeChef 3 star

9x hackathon winner. 13 merged open-source fixes, 7 in LiveKit, plus Piper and Mastra. 1,000+ concurrent AI interviews in production. CodeChef 3 star.

Why hire me

I ship voice agents
to production

Lead the AI & real-time stack of two AI interviewers at InCruiter: 1,000+ concurrent interviews in 42+ languages on LiveKit Agents, Vapi telephony and Azure OpenAI, with feature-flagged releases to LiveKit Cloud.

I fix the frameworks
I build on

13 merged PRs in other people's repos, 7 of them in LiveKit (agents, python-sdks). Every one starts with a test that fails on main: proof first, smallest fix second.

I understand the models
from the paper up

7 papers rebuilt from scratch in PyTorch, each with a check script: Transformer, GPT + BPE, Whisper, Conformer + RNN-T, LLM.int8/GPTQ/FlashAttention, LoRA/DPO/GRPO and speculative decoding.

Looking for: Voice AI Engineer · Agents / Applied AI Engineer · Real-time ML · Forward Deployed Engineer
Based in: India (IST) · remote-first, comfortable overlapping with US and EU teams
📫 hassankazinasik@gmail.com · resume on request

Proof of work: merged open source

LiveKit   Open Home Foundation   Mastra   KoljaB

Project Merged fix Why it mattered
LiveKit Agents #7741 · #7742 the call recorder no longer hangs when its encoder fails · the TTS markup tokenizer survives stray closing tags
LiveKit python-sdks #860 · #861 · #862 · #864 · #865 webhook sha256 check · Twirp base path behind proxies · AudioMixer survives a slow input · correct I420A/I422/NV12 plane layout · canSubscribeMetrics grant
Piper TTS (Open Home Foundation) #328 Hebrew voices get the Hebrew phonemizer in PyTorch inference
Mastra #27102 Sarvam listen() uses the configured model; three more of my bug reports fixed by the team
RealtimeSTT / RealtimeTTS #329 · #330 · #383 Hindi/Bengali transcripts keep their final full stop · feed_audio on tiny chunks · ElevenLabs voice settings sent
stream2sentence #16 Urdu sentences split at ۔

All merged PRs · In review now (LiveKit, Pipecat, NVIDIA NeMo, sherpa-onnx, Piper)

About me

I build real-time voice agents, and I keep asking one question: why do voice agents break on real Indian speech, and how do we fix it?

  • 🏢 Now: Product Developer at InCruiter, leading the AI & real-time stack behind InCBot and IncScreen
  • 🌍 Before: AI Engineer at myRide (Boston, fully remote)
  • 🐛 Found in prod: English-only guards scored Devanagari 0.39 vs a 0.5 threshold; Marathi STT hallucinated in 10 of 15 turns
  • 🔭 Building: an English/Hindi/Marathi voice agent on open models, CPU only
  • 🏆 9× hackathon winner · CodeChef 3★ · LeetCode Knight
 Animated voice agent orb: listening and speaking

How a production voice agent works

Architecture of a real-time voice interviewer: candidate over WebRTC to a LiveKit room; Python agent worker with VAD, Sarvam STT, GPT-4.1 with tools and streamed TTS; script-aware guards and feature flags; CI/CD to LiveKit Cloud.

📄 Papers I rebuilt from scratch

Paper Repo What it shows
🧠 Transformer (Vaswani 2017) attention-is-all-you-need-hindi English → Hindi on 1.36M sentence pairs
🧠 GPT + BPE gpt-from-scratch 12M-param GPT with its own tokenizer
👂 Whisper (Radford 2022) whisper-from-scratch exact audio front-end, WER/CER on English and Hindi
👂 Conformer + RNN-T conformer-rnnt streaming ASR with transducer loss and beam search
⚡ LLM.int8 · GPTQ · FlashAttention quant-flash measured perplexity on Qwen2.5-0.5B, Triton kernel
🎯 LoRA · DPO · GRPO post-training preference training that makes a model answer Hindi in Hindi
🚀 Speculative decoding speculative-decoding Leviathan et al. 2023, Algorithm 1 on a hand-written Llama

Toolbelt

🎙️ Voice AI

LiveKit Agents Pipecat WebRTC Vapi Sarvam AI ElevenLabs Deepgram sherpa-onnx

🧠 ML & LLMs

PyTorch Hugging Face ONNX llama.cpp Azure OpenAI Claude

⚙️ Engineering



🕒 Recently pushed

  • post-training — LoRA, DPO and GRPO implemented from scratch on a hand-written Llama/Qwen2… · 2026-10-14
  • speculative-decoding — Speculative sampling (Leviathan et al. 2023) from scratch on a hand-written… · 2026-10-14
  • quant-flash — LLM.int8(), GPTQ and FlashAttention implemented from scratch in PyTorch (+ a… · 2026-10-14
  • whisper-from-scratch — Whisper reimplemented from scratch in PyTorch: exact audio front-end, encoder-… · 2026-10-14
  • attention-is-all-you-need-hindi — Transformer (Vaswani et al. 2017) from scratch in PyTorch: English to Hindi… · 2026-10-14

🖥️ hassan@voice-lab

hassan@voice-lab: Voice AI Engineer at InCruiter; 1,000+ concurrent interviews in 42+ languages; LiveKit Agents, Vapi, WebRTC.

GitHub activity

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Building voice AI for your users? Let's talk.

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