STEM Jobs in Canada — Remote Full-Time Engineer

STEM Jobs in Canada (Remote, Full-Time) — Engineering Roles on Rex.zone

Rex.zone connects engineers and technical professionals to remote, full-time roles supporting real-world AI/ML training workflows, including RLHF evaluation, data labeling, QA evaluation, prompt evaluation, named entity recognition, computer vision annotation, and content safety labeling.

What You Will Work On

* Create, validate, and improve training datasets used in LLM training pipelines

* Run RLHF-style preference judgments and structured LLM evaluations

* Perform QA evaluation and prompt evaluation; diagnose failure modes and improve model performance

* Support NLP tasks (e.g., named entity recognition) and CV tasks (e.g., bounding boxes/segmentation) as needed

* Apply content safety labeling and sensitive-content handling procedures

Key Responsibilities

* Follow detailed labeling/evaluation specs and document edge cases

* Review/adjudicate annotations, run spot checks, and track quality metrics

* Collaborate with engineering/research stakeholders to align evaluation rubrics with product goals

* Iterate on prompts, test sets, and guideline clarity to maintain reliable, auditable pipelines

Required Qualifications

* Mid-Senior experience in an engineering, STEM, or technical role

* Strong analytical reasoning, attention to detail, and guideline adherence

* Comfort with structured data, taxonomies, and evaluation rubrics

* Familiarity with NLP/ML concepts and data quality practices; ability to use Python for dataset review

Preferred

* Experience with RLHF evaluation, data labeling, QA evaluation, prompt evaluation, NER, CV annotation, or content safety labeling

* Exposure to gold sets, inter-annotator agreement, error analysis, dataset versioning, and evaluation-driven iteration

How To Apply

Create or update your Rex.zone profile, highlight relevant STEM experience, and apply with a short summary of your domain strengths (NLP, CV, content safety, or evaluation).