Machine Learning Engineer, Data & Training Infrastructure

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 Engineer to own the operational data pipeline end-to-end. The role requires "T-shaped" expertise: depth in data and orchestration fundamentals, and the ability to coordinate everything that touches the data: from the upload interface, audio preprocessing (VAD, ASR), annotation, training data export, to evaluation.

What You'll Own

• End-to-end audio annotation pipeline: Currently some stages exist as prototypes; productionizing and rebuilding them is work that’s currently in flight.

• Quality systems: Automated tooling to catch annotation errors, alignment drift, and silent regressions before training runs.

• Dataset versioning and experimenter tooling: the model team will want to subset the vetted pool ("speakers X/Y/Z, duration 3–12s, quality > 0.8") into reproducible training manifests. The query interface, manifest format, and lineage tracking are all yours.

• Linguist- and annotation-team-facing tooling: annotation UI, PM workflow for project management, QC dashboards.

• Pipelines for full- and half-duplex training data

What We're Looking For

• Strong software engineering fundamentals: Python, distributed systems, comfort across the stack.

• Database design fluency: you reach for the right schema and have operated Postgres or similar in production.

• Production data pipelines on cloud-native infrastructure (GCP preferred). Our data stack is currently GCP-dominant.

• Operational comfort: containers, CI/CD, IAM, cost-aware infrastructure choices, etc.

• Strong attention to detail on data quality.

• Comfort being out of your depth at the boundary. You'll sometimes debug code you didn't write in tools you don't use daily. You should find this energizing, not threatening.

• Bias toward building the abstractions so the modeling team doesn't stay stuck doing data work by hand.

Nice to have

• Multilingual data pipeline experience.

• Audio DSP, signal processing, or speech recognition background.

• Large-scale training infra (FSDP, DeepSpeed, Ray).

• Annotation tooling and human-in-the-loop systems.

• Comfort working close to research teams.

Why Join Rime

• Build the data infrastructure behind a category-defining voice AI company.

• The pipelines you build determine what models we can train.

• 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!