Lead AI Engineer (Speech / Voice)

We are a YC-backed AI startup building the worlds most advanced real-time Speech AI coach used in online calls. Over the past six months, weve grown from $100k to $5M ARR, raised $2.5M from top-tier investors, and assembled a world-class engineering team (ex-Google, Nvidia, Lyft, Amazon) solving hard problems in voice, ML, and real-time infrastructure.

We are looking for a senior, hands-on engineer to lead development of our real-time Voice AI Agent and internal ML toolkit. Youll own end-to-end systems across real-time audio, applied ML, and production deployment working directly with our CEO and CTO.

What Youll Do

• Build and scale our Real-Time Voice AI Agent (LiveKit/WebRTC): streaming ASR/TTS, VAD, diarization, state machines, session management, latency/QoS tuning.
• Develop our ML toolkit and ship models to prod (ASR, TTS, VAD, embeddings, speaker ID). DSP, ffmpeg/decoding, ONNX/TensorRT, reproducible pipelines.
• Contribute to backend when needed (Nest.js/Node.js, REST/OpenAPI, Postgres/Supabase).
• Work on applied ML around LLMs: RAG, function-calling, routing, safety, A/B testing.
• Design reliable real-time systems: backpressure, retries, idempotency, batching, caching.
• Build data workflows: collection, cleaning, anonymization, synthetic data, offline/online eval.
• Own observability & SLOs: Prometheus, Grafana, Sentry, tracing, alerting.
• Deploy and operate infra: Docker, GitHub Actions, LiveKit Cloud, Modal/AWS (GPU inference).
  
  
  

What We Value

• Ability to move fast and deliver (high-intensity, startup mindset).
• Experience in big tech / strong VC-backed startups / Yandex / research labs.
• Any founder experience (even failed).
• Strong engineering fundamentals taste in product & design.
• Open-source contributions, ML/algorithms background, Kaggle/CF/olympiads are a plus.
• A public presence: blog, Twitter, engineering posts bonus points.
• Clear communication and ability to explain complex systems simply.
  
  
  

We do not hire from outsourcing firms, Web3, or gambling.

What We Offer

• High-ownership role with direct impact on product and roadmap.
• Work directly with CEO/CTO every day.
• Competitive salary meaningful equity (company valued at :$20M last year).
• Fully async remote, any timezone (via Deel).
• US visa support (O-1).
• 12 global offsites per year (last one Bali).
• Clear growth path: compensation increases with delivered projects.