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ANDROIDHASSAN/README.md
Hassan Kazi. Voice AI Engineer: real-time voice agents and Indic speech.
Real-time voice agents, 1,000+ concurrent AI interviews, Indic speech, paper reimplementations

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Followers

9x hackathon winner. 11 merged open-source fixes in LiveKit, Piper and Mastra. 1,000+ concurrent AI interviews in production. CodeChef 3 star.

About Me

I build real-time voice agents, and I'm chasing 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
  • 🏆 9× hackathon winner · CodeChef 3★ · before InCruiter: AI Engineer at myRide (Boston, remote)
  • ⚡ Scale: AI interviewers running 1,000+ concurrent interviews in 42+ languages
  • 🐛 Found in prod: English-only guards scored Devanagari 0.39 vs a 0.5 threshold; Marathi STT hallucinated in 10 of 15 turns
  • 🔧 Open source: 11 merged fixes in LiveKit (agents, python-sdks), Piper TTS, Mastra and KoljaB's RealtimeSTT / RealtimeTTS / stream2sentence (Indic and Urdu text); all merged PRs
  • 🔭 Building: my own Hindi/Marathi STT + TTS + LLM and a from-scratch streaming orchestrator
  • 📄 Learning: rebuilding transformers, Whisper, VITS and Moshi from the original papers
  • 📫 Reach me: hassankazinasik@gmail.com
 Animated voice agent orb: listening and speaking

🖥️ hassan@voice-lab

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

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.

Building in Public

own-voice-models: my own STT, LLM and TTS with a streaming orchestrator. Building. indic-guard: script-aware text matching for Devanagari and romanized replies. Next.
IndicVoiceBench: open benchmark of STT and TTS on Indian phone audio. Next. Hinglish Turn Detector: end-of-turn model for code-mixed speech. Planned.
Voice agent pipeline with the project that targets each stage and its status. Target voice-to-voice latency budget of about 800 ms, not yet measured.

📄 Rebuilding the AI Stack from the Papers Up

🧠 LLM 👂 ASR 🗣️ TTS 🔊 Audio
Transformer · BPE Whisper VITS + HiFi-GAN SoundStream (RVQ)
LLM.int8 · GPTQ · FlashAttention Conformer + RNN-T StyleTTS 2 Moshi
LoRA · DPO · GRPO · speculative decoding wav2vec 2.0 F5-TTS Voice Activity Projection

One repo per paper, each with notes on what I learned.

Toolbelt & Tech Stack

🎙️ Voice AI

LiveKit Agents WebRTC Vapi Sarvam AI Azure OpenAI ElevenLabs Deepgram Silero VAD

🧠 ML & LLMs

PyTorch Hugging Face ONNX Whisper LoRA 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

✍️ Writing & Open Source

  • 📝 Why voice agents break on Hindi: 4 failure modes (draft)
  • ✅ 11 merged fixes (all):
    • LiveKit · agents #7741 recorder no longer hangs when the encoder fails, #7742 XML depth check · python-sdks #860 webhook sha256 claim, #861 Twirp base path behind proxies, #862 AudioMixer survives a late frame
    • Piper TTS (Open Home Foundation) #328 Hebrew phonemizer in inference
    • Mastra #27102 Sarvam listen() uses the configured model
    • RealtimeSTT #329 final full stop for Hindi/Bengali/Tamil, #330 feed_audio on tiny chunks · RealtimeTTS #383 ElevenLabs voice settings · stream2sentence #16 Urdu sentence splitting
  • 🔧 In review: LiveKit, Pipecat, NVIDIA NeMo, sherpa-onnx, Piper, Sarvam skills (open PRs)
  • 🛠️ Earlier I shipped CRMs: Interify · CupCount

GitHub Analytics

GitHub streak

Contribution snake

🎙️ From Hassan Kazi — let's build voice AI that understands India.

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