Machine Learning Scientist

MACHINE LEARNING SCIENTIST

Rime builds voice AI for enterprises running customer experiences at scale. Our text-to-speech models are purpose-built for high-volume conversational deployments, engineered for the pronunciation accuracy, latency, and deployment flexibility that production environments actually demand.

We started from a different premise than the rest of the field: voice AI isn't bottlenecked by model architecture. It's bottlenecked by data. So before we trained a single model, we built our own corpus: full-duplex, studio-quality conversational speech, recorded and annotated by PhD linguists. That's our moat. It's also why enterprises pick Rime when pilots need to convert into production.

We're backed by top-tier investors including Unusual Ventures, and we've built a team at the intersection of product, research, and craft. Building voice models is an art. We intend to master it.

ROLE OVERVIEW

We're hiring a Machine Learning Scientist to push the frontier of speech synthesis and speech understanding at Rime.

What You'll Own

- Design, train, and evaluate speech synthesis models, autoregressive and non-autoregressive.

- Drive research on full-duplex and half-duplex multi-modal architectures, including unified S2S systems.

- Choose and iterate on speech representations: neural codecs, semantic tokens, mel features, continuous latents.

- Build rigorous evaluation, objective and perceptual. Hold the bar on quality and prosodic control.

- Collaborate with our linguists on TTS frontend behavior so modeling and frontend choices reinforce each other.

WHAT WE'RE LOOKING FOR

- Deep familiarity with the speech synthesis literature, contemporary and historical — Tacotron, FastSpeech, VITS, VALL-E, the codec-LM lineage. Opinions on what worked and why.

- Hands-on training with neural codecs (EnCodec, DAC, Mimi, etc.) and multiple representation choices.

- Experience with full- or half-duplex multi-modal modeling (Moshi, LLaMA-Omni, streaming S2S).

- Strong attention to detail on data quality. You notice when an annotation pipeline is silently degrading or when an eval set has leakage.

- Willing to roll up your sleeves on unglamorous data and training work — paired with the agency to build pipelines so the team isn't stuck doing it by hand.

- Working knowledge of TTS frontend (G2P, normalization, prosody) and experience working with linguists.

- Strong PyTorch fundamentals. Comfortable with training loops, distributed training, model internals.

- PhD or equivalent research experience in speech, audio, ML, or computational linguistics or a track record that makes the credential irrelevant.

Nice to have

- Multilingual TTS experience.

- Background in prosody or paralinguistics.

- Published work in speech, audio, or core ML venues.

- Experience taking research models to production: quantization, distillation, streaming inference.

WHY JOIN RIME

- Category-defining voice AI infrastructure, not incremental research deltas.

- Direct collaboration with founders, including a CEO with a Stanford computational linguistics PhD.

- Real impact on company trajectory.

- Meaningful equity upside.

- High ownership, high standards, low bureaucracy.

What We Offer

- Competitive base + meaningful early-stage equity

- Remote-friendly

- Visa sponsorship available

- Access to a proprietary, full-duplex, studio-quality conversational speech corpus

- Compute and tooling to do the work

- Direct influence on the future of voice AI

At Rime, we...

- Are outliers

- Cut through the hype to focus on the craft

- Move fast with agency and freedom

- Maintain a growth mindset, finding joy in the struggle

- Do the right things, knowing that it'll lead to making money

If that sounds like you too, you'll be a great fit for Rime!