STEM Research Engineer; Canada)

STEM Research Jobs in Canada

Rex.zone is hiring a STEM Research Engineer to support applied AI/ML research and engineering workflows, including LLM training pipelines, dataset development, RLHF, prompt evaluation, and QA evaluation. This is a remote, full‑time role focused on improving training data quality and measurable model performance across NLP and computer vision.

• Design and execute applied STEM research experiments aligned to model performance improvement and deployment constraints
• Build and maintain LLM training pipelines combining data labeling, RLHF signals, and QA evaluation outputs
• Develop prompt evaluation protocols and scoring rubrics for large language model evaluation
• Implement training data quality checks: annotation guidelines compliance, inter‑annotator agreement, and sampling audits
• Run error analysis for NLP and computer vision tasks (e.g., named entity recognition and annotation edge cases)
• Support content safety labeling workflows with taxonomies, adjudication rules, and escalation criteria
• Produce reproducible documentation, experiment logs, and code to ensure traceability
• Communicate findings and recommendations to technical and non‑technical stakeholders

• Mid‑Senior experience in STEM research, applied ML research, or engineering research roles
• Strong Python for data processing, experiment automation, and evaluation tooling
• Hands‑on experience with NLP, computer vision, or multimodal evaluation
• Knowledge of data labeling, QA evaluation, and annotation guidelines compliance
• Familiarity with RLHF and prompt evaluation methods
• Strong experiment design and statistical reasoning
• Experience collaborating in remote, cross‑functional teams

$30–$50 per hour (base salary).

Remote, full‑time.