Senior Machine Learning Engineer

A1 is building a proactive AI system that carries work forward across conversations, tools, and time.

As a Senior Member of Technical Staff, Machine Learning, you are an independent owner of critical ML subsystems in production. You take ambiguous problems, design practical solutions, and ship systems that operate reliably at scale.

This is a hands‑on, high‑impact role focused on depth.

• Build core ML systems that power a proactive, long‑horizon AI product.

• Own work end‑to‑end: data preparation, training, evaluation, inference, and iteration.

• Turn research ideas into working systems that run reliably in production.

• Debug model failures and system issues using real production signals.

• Iterate quickly: ship, measure outcomes, refine, and repeat.

• Collaborate closely with research, product, and engineering to deliv...