Lead AI Engineer (Voice)

TL;DR

Lead AI Engineer (Voice): Lead the development of a Voice AI Agent and internal ML toolkit with an accent on real-time voice pipelines, ML model deployment, and applied LLMs. Focus on designing reliable real-time systems, optimizing performance, and ensuring production readiness for a rapidly growing AI speaking coach product.

Location: Full async remote, any timezone. Onboarding via Deel in [almost] any country. Cannot hire individuals located in Russia. Relocation to the U.S. available with H-1B visa sponsorship.

Company

AlumniHub is building an AI Speaking Coach that listens to online calls to help users improve their English, having recently graduated from Y Combinator and grown rapidly to $5M ARR.

What you will do

• Lead end-to-end development of the Voice AI Agent and internal ML toolkit, owning voice/real-time pipelines.
• Train and deploy various ML models (ASR, TTS, VAD, speaker/diarization, embeddings) to production.
• Implement applied ML solutions with LLMs, including RAG and tool-calling, balancing quality and cost.
• Design and maintain reliable real-time systems, focusing on idempotency, backpressure, and caching.
• Set up data pipelines for model training, evaluation, and regression testing.
• Maintain observability (Sentry, Prometheus/Grafana/Loki) and ensure quick issue resolution.

Requirements

• Experience in big tech, VC-backed startups, or Yandex.
• No experience in EPAM, outsourcing agencies, consulting, Web3, or gambling.
• Significant contributions to open-source GitHub repositories (>10 stars, >500 contributions in the past year).
• Active tech blog, Twitter, or Telegram channel.
• Concrete examples of awesome applications built or significantly contributed to.
• Any founder experience (even unsuccessful).
• Good taste and hands-on design experience.
• Warm recommendations from colleagues or CEOs/CTOs.
• English: B2 required (implied).

Culture & Benefits

• Work at high velocity with a focus on consistent production delivery.
• Daily collaboration directly with the CEO/CTO as Engineer #5.
• High independence and end-to-end ownership of projects.
• Competitive salary with 1% founding engineer equity and future increases based on performance.
• Full async remote work with any timezone.
• Regular 1-2 off-sites per year (e.g., Bali).