Remote STEM Engineer (Brazil)

Rex.zone; Brasil; On-site; BRL 216,603 - 361,006; Full time

Job summary

A remote technology company in Brazil is seeking to hire a mid-senior engineer to support AI/ML pipelines through data labeling and quality assurance. Responsibilities include reviewing annotations, evaluating model outputs, and ensuring compliance with guidelines. Ideal candidates will have a strong background in STEM and proficiency in Python and SQL. The role offers a competitive hourly rate between $30 and $50 with a fully remote work environment.

Qualifications

• Mid-Senior engineering experience in a STEM domain.
• Ability to follow detailed rubrics and evaluation instructions precisely.
• Working knowledge of Python and SQL for analysis and validation.

Responsibilities

• Support AI/ML pipelines through data labeling tooling and QA evaluation.
• Execute prompt evaluation tied to large language model evaluation.
• Review computer vision annotations and ensure guideline compliance.

Skills

Problem-solving

Documentation habits

Remote work comfort

Attention to detail

Tools

Python

SQL

Spreadsheet-based QA workflows

Internal annotation/evaluation tools

Job description

Remote STEM Jobs in Brazil

Rex.zone connects remote professionals with AI/ML and engineering work that strengthens model training pipelines, improves dataset reliability, and supports scalable evaluation operations across distributed teams.

Remote STEM Jobs in Brazil

Rex.zone connects remote professionals with AI/ML and engineering work that strengthens model training pipelines, improves dataset reliability, and supports scalable evaluation operations across distributed teams.

What You Will Do

• Support AI/ML pipelines through data labeling tooling, QA evaluation, and training data quality checks
• Execute prompt evaluation and structured feedback loops (RLHF) tied to large language model evaluation
• Validate named entity recognition outputs and perform error analysis for NLP tasks
• Review computer vision annotations (e.g., bounding boxes/segmentation) and ensure guideline compliance
• Perform content safety labeling reviews using established taxonomies and rubrics
• Create audit-ready documentation, metrics reporting, and issue tracking to reduce rework cycles
  
  

Required Qualifications

• Mid-Senior engineering experience in a STEM domain
• Strong problem-solving, documentation habits, and comfort working fully remote
• Ability to follow detailed rubrics and evaluation instructions precisely
• Working knowledge of Python and SQL for analysis and validation
  
  

Tools & Workflow

• Python, SQL, spreadsheet-based QA workflows, issue tracking, and internal annotation/evaluation tools
• Dataset QA practices such as sampling strategies, consistency checks, and reproducible reporting
  
  

Compensation

Competitive hourly rate: $30–$50/hr (USD).

Remote Type: Remote. Employment Type: Full-time.