AI Developer Jobs in Canada

About Rex.zone Rex.zone builds AI-powered recruiting and talent solutions. This remote role focuses on building, evaluating, and deploying AI systems used in real-world ML training pipelines—LLM applications, RLHF workflows, data labeling automation, QA evaluation, prompt evaluation, and model performance improvement.

Responsibilities

• Build and maintain AI services for training and inference (batch + real-time APIs)
• Implement evaluation harnesses for LLM evaluation, prompt evaluation, and regression testing
• Integrate RLHF feedback loops and human review tooling to improve model behavior
• Develop data pipelines supporting data labeling, NER, and computer vision annotation at scale
• Define metrics for model performance improvement and monitor quality drift in production
• Partner with annotators/QA to enforce annotation guidelines compliance and resolve edge cases
• Contribute to content safety labeling workflows (policy routing, moderation, audits)

Preferred Background

• Strong Python engineering with ML frameworks (PyTorch/TensorFlow) and API development
• Experience with LLM pipelines, evaluation datasets, and prompt iteration
• Familiarity with MLOps, CI/CD, containerization, and cloud deployment
• Knowledge of NLP (NER, classification, retrieval) and/or CV (detection, segmentation)

How To Apply Apply via Rex.zone and include examples of shipped ML systems, evaluation frameworks, and deployment/debugging work.

Compensation: $30–$50 per hour (base).