Skip to main content
Telecommut

Senior AI Data Annotation Jobs in Toronto (Remote)

Rex.zone

Full time 30 - 50 CAD / hour Posted: 3 weeks ago Software Development

Hiring from: Canada

Rex.zone is hiring senior contributors to lead AI data annotation and QA evaluation workstreams that improve training data quality for modern AI/ML systems. This is a remote, full-time role aligned to real-world LLM training pipelines across NLP, computer vision, and content safety domains.

About The Role

You will translate product and research goals into labeling instructions, refine guidelines for edge cases, adjudicate ambiguity, and drive measurable quality improvements through audits, calibration, and error analysis. Work includes RLHF preference ranking, prompt evaluation, named entity recognition, computer vision annotation (bounding boxes/segmentation), and content safety labeling.

What You Will Do

  • Create, iterate, and maintain annotation guidelines and SOPs for complex datasets
  • Perform and audit data labeling with measurable annotation guidelines compliance
  • Execute RLHF comparison tasks and curate preference data with consistent rubrics
  • Run QA evaluation programs: sampling plans, golden sets, inter-annotator agreement, defect taxonomy tracking
  • Connect annotation outcomes to model performance improvement and large language model evaluation outcomes
  • Document dataset lineage, versioning, and evaluation criteria

Required Qualifications

  • Senior-level experience in AI data annotation / data labeling and rubric-based review
  • Ability to interpret ambiguous examples, adjudicate edge cases, and write clear instructions
  • Understanding of how labeled datasets impact RLHF outcomes and downstream model behavior
  • Strong communication and cross-functional collaboration (Engineering, Product, Research)

Preferred Qualifications

  • Hands-on RLHF workflows and prompt evaluation for conversational AI
  • Content safety labeling and policy-driven evaluation experience
  • Multimodal computer vision annotation exposure (detection/segmentation)
  • Experience scaling annotation programs with vendors or distributed teams

How To Apply

Apply via Rex.zone with a resume highlighting AI data annotation scope, QA evaluation experience, and any RLHF or prompt evaluation work. Include examples of guideline writing, calibration, adjudication, and training data quality improvements.

How to apply

To apply for this job you need to login. If you don't have an account yet, please register.

Post a resume

Similar jobs

At Lantern , our company culture stands as the bedrock of our success and a source of pride for our teams. We firmly believe that a culture founded on trust forms the basis for enduring relationships with clients, colleagues, and...

Full time Posted: 7 hours ago Hiring from: Canada

About OpenLoop OpenLoop was co-founded by CEO, Dr. Jon Lensing, and COO, Christian Williams, with the vision to bring care anywhere. Our telehealth support solutions are thoughtfully designed to streamline and simplify go-to-market care delivery for companies offering meaningful virtual...

Full time Posted: 8 hours ago Hiring from: Canada

Analyst1 is an industry-leading cybersecurity solution provider that specializes in advanced threat intelligence. Automated data ingestion and investigations transform security operations through superior threat analysis that also analyzes the effectiveness of countermeasures in a single platform. We are always always...

Full time Posted: 8 hours ago Hiring from: United States
Staff Platform Engineer

Robots & Pencils

Location: This position can be located in the following area(s): remote in Canada Company Overview Robots & Pencils is an applied AI engineering firm building the next frontier of business architecture. We design and ship AI co-workers that integrate into...

Full time Posted: 10 hours ago Hiring from: Canada