Mistral AI · Paris/London/Warsaw · Hybrid

Research Engineer, Orchestral

10/18/2026

Description

  • Design and build the core of the Orchestral platform: the library, abstractions and tooling researchers use to train and evaluate models.

  • Build and evolve the rollout engine, shipping new capabilities such as long-running tasks and subagents.

  • Run Orchestral as a production system: keep training and evaluation workloads reliable at scale.

  • Improve how data and jobs flow through the platform as usage grows — scheduling, routing and request handling.

  • Treat researchers as your users: understand their workflows and turn recurring needs into robust, shared tooling.

  • Raise the bar on engineering quality across the platform: testing, code review, CI/CD, observability and documentation.

  • Contribute to open-source rollout-engine and agent-infrastructure projects where it benefits the platform.

Qualifications

  • Experience directly building and debugging complex distributed systems at scale, with an emphasis on reliability and scalability.

  • Strong Python skills and solid software-design instincts: testing, code review, CI/CD.

  • A builder mindset: you have constructed systems from the ground up, not just operated polished ones.

  • A track record in small teams running complex systems at scale — for example in finance, crypto or ad tech.

  • Self-starter, low-ego and collaborative, with a product mindset toward your users.

  • Curiosity about ML and RL — this experience is not required, but a desire to learn is.

Nice to have

  • Hands-on experience with Ray or similar distributed-computing frameworks.

  • Open-source contributions, especially to rollout-engine or agent-infrastructure projects such as SLIME, verl or PrimeRL.

  • Experience building or working with agentic workflows and environments.

Application

View listing at origin and apply!

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