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Member of Technical Staff, Machine Learning

AI / ML Engineer • Remote • Full-time • 📍 Portugal

A1 builds a proactive AI assistant for everyday users, bringing intelligence to conversations, errands, and workflows with minimal prompting. In this role, you'll build core components of production machine learning systems, working closely with senior ML engineers.

Responsibilities

  • Build and improve ML components across data, training, evaluation, and inference
  • Fine-tune and adapt models as part of larger production systems
  • Implement evaluation and testing to understand model behavior
  • Help build and maintain data pipelines for real-world and synthetic data
  • Debug model issues, performance problems, and production incidents
  • Ship improvements iteratively and learn from real user feedback
  • Work closely with senior ML engineers and product teams
  • Work under real production constraints: latency, cost, reliability, and safety

Requirements

  • Strong foundations in machine learning and modern neural architectures
  • Hands-on experience training, fine-tuning, or deploying ML models
  • Comfortable writing production-quality code and learning new tools quickly

Soft skills

Curious, coachable, and eager to learn from real systems in productionAble to work through ambiguity with guidance, growing ownership over timeBias toward shipping, iteration, and continuous improvement

About the company

A1 is a small, high-talent-density, hands-on team that makes decisions collectively and moves at rapid speed, aiming to put a truly magical product in users' hands.

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