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.