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).