STEM Research Engineer (Canada)

STEM Research Jobs in CanadaRex.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.Key ResponsibilitiesDesign and execute applied STEM research experiments aligned to model performance improvement and deployment constraintsBuild and maintain LLM training pipelines combining data labeling, RLHF signals, and QA evaluation outputsDevelop prompt evaluation protocols and scoring rubrics for large language model evaluationImplement training data quality checks: annotation guidelines compliance, inter-annotator agreement, and sampling auditsRun 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 criteriaProduce reproducible documentation, experiment logs, and code to ensure traceabilityCommunicate findings and recommendations to technical and non-technical stakeholdersRequired QualificationsMid-Senior experience in STEM research, applied ML research, or engineering research rolesStrong Python for data processing, experiment automation, and evaluation toolingHands-on experience with NLP, computer vision, or multimodal evaluationKnowledge of data labeling, QA evaluation, and annotation guidelines complianceFamiliarity with RLHF and prompt evaluation methodsStrong experiment design and statistical reasoningExperience collaborating in remote, cross-functional teamsCompensation$30–$50 per hour (base salary).Remote, full-time.