AI Engineer (Audio)

Team: Research team Location: Paris Employment type: FullTime

TLDR: Audio / Multimodal ML Engineer to train and ship speech, audio and multimodal models for an AI safety platform that operates at 100M+ API calls/month.

ABOUT US

White Circle is an AI Safety company building the safety, reliability, and optimization layer for AI systems. At the core of our platform are policies – simple natural-language rules that define what an AI model should and shouldn’t do. We automatically test, enforce, and continuously improve these policies at scale.

• We’ve raised $11M from top funds, founders, and senior leaders at OpenAI, Anthropic, HuggingFace, Mistral, DeepMind, Datadog, Sentry, and others
• We process over one hundred million API calls every month
• We fine-tune and train our own LLMs so they run faster and cheaper than any open or proprietary model

We’re a small, highly focused team. If you want to work deeply on hard problems, see your work ship to production quickly, and influence how AI safety is actually built – you’re the one we need.

YOU WILL:

• Train and fine-tune large-scale audio and multimodal models from scratch and from pretrained checkpoints
• Design and run experiments: architecture changes, data mixes, training recipes
• Build and maintain audio data pipelines — from raw recordings to training-ready datasets
• Optimize models for production: quantization, distillation, streaming inference
• Deploy models end-to-end: from research checkpoint to low-latency serving
• Collaborate with research to turn experimental ideas into shippable features
• Define evaluation metrics and benchmarks that actually matter for the product

YOU’LL FIT RIGHT IN IF YOU: