Machine Learning Engineer - Reinforcement Learning

This role requires mandatory RL training experience with LLMs, including designing and iterating on rewards, reviewing LLM traces, identifying reward hacking or shortcut behaviour, and understanding when the reward signal, environment, or training process needs to change.

Responsibilities:

• Design and implement LLM-powered agent environments for supply chain decision-making
• Fine-tune, adapt, and evaluate LLMs for domain-specific reasoning and decision support
• Design, test, and iterate on reward functions that capture the behaviors we want from LLM agents
• Review LLM traces and rollouts to understand model reasoning, failure modes, reward hacking, and shortcut behaviour
• Identify when an LLM is exploiting the reward function, escaping the intended RL process, or optimizing for proxy metrics instead of the real objective
• Improve reward models, environment design, prompts, tools, and feedback loops based on observed model behaviour
• Build evaluation frameworks to measure model quality, agent performance, robustness, and failure modes
• Create data pipelines for training, fine-tuning, preference data, synthetic data generation, and human feedback collection
• Develop tooling that improves how the team builds, tests, debugs, and deploys AI-assisted workflows
• Experiment with RL, RLHF, RLAIF, reward shaping, policy optimization, and agent training techniques
• Document what works, what fails, and why, so we can compound our learnings over time
• Stay close to the frontier of LLMs, agents, evaluations, and applied AI engineering

We want to talk if you:

• You've trained or fine-tuned LLMs
• Are excited about AI-assisted tools and getting the most out of them
• Build & customize your own AI workflows
• Have experience working with AI agents and RL environments in production
• Are proficient in Python and PyTorch
• Can balance research exploration with shipping working code
• Hands on experience with RL techniques (reward shaping, policy optimization, RLHF)
• Thrive in fast-moving environments where priorities shift
• Care about craft in your work
• Are curious about why things work, not just that they work

Bonus points if:

• You have experience with human-in-the-loop ML systems
• You've built evaluation frameworks for open-ended tasks
• You're familiar with supply chain, logistics, or operations domains
• You have a side project that shows you can't stop tinkering

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All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status.