Senior Data Annotator Jobs in Zurich (Remote)

Join Rex.zone to produce high-accuracy training data and evaluations for AI/ML systems. You will contribute to LLM training pipelines through data labeling, RLHF preference ranking, prompt/response evaluation, and QA evaluation to improve model behavior, safety, and helpfulness.

What You Will Do

• Perform senior-level data annotation and evaluation across multiple domains while balancing speed and training data quality
• Apply detailed rubrics and maintain strong annotation guidelines compliance
• Provide clear written rationales on ambiguous cases and escalate guideline gaps
• Participate in calibration sessions and periodic gold-task checks
  
  

Core Workstreams

• RLHF & LLM evaluation: rank model outputs; assess helpfulness/harmlessness; apply policy-based judgments
• NLP labeling: named entity recognition, intent classification, text span labeling, prompt evaluation
• Computer vision annotation: bounding boxes, polygons, keypoints, segmentation masks, visual QA
• Content safety labeling: classify sensitive content and enforce safety taxonomies
• Training data QA: audits, disagreement analysis, sampling/rework, discrepancy analysis
  
  

Required Qualifications

• Mid-senior experience in data annotation or evaluation operations
• Strong reading comprehension and decision consistency under detailed rubrics
• Comfort working with NLP, LLM evaluation, and QA evaluation methods
• Ability to meet accuracy targets and throughput expectations
  
  

Compensation

$30–$50 per hour (HOURLY, base salary).

Remote, full-time role supporting distributed teams.

How To Apply

Apply through Rex.zone and be prepared to complete a short skills screening focused on training data quality, evaluation consistency, and guideline adherence.