STEM Research Engineer (Brazil)
Rex.zone · United States
- Hybrid
- Full-time
- $104,000 / year
- United States
Tailored resume — keyword-matched to this role.
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Job highlights
- Improve AI/ML training pipelines remotely.
- Conduct applied research and data operations.
- Design and execute experiments for model evaluation.
- Create and analyze datasets for various ML tasks.
- Collaborate with engineering on training iterations.
About the role
STEM Research Engineer at Rex.zone
Join a full-time, remote STEM research-focused engineering role improving AI/ML training pipelines through applied research, evaluation, and data operations. You will translate research questions into measurable studies, create datasets and evaluation protocols, and strengthen large language model evaluation tied to training data quality and model performance improvement.
Key Responsibilities
- Design and run experiments that measure model behavior and data quality impacts.
- Build and analyze datasets for named entity recognition, content safety labeling, and model evaluation.
- Create annotation guidelines and ensure annotation guidelines compliance across contributors.
- Execute RLHF evaluation and prompt evaluation workflows; document rubrics and edge cases.
- Perform QA evaluation on labeled data and evaluations to reduce noise and bias.
- Collaborate with engineering teams to integrate findings into training iterations.
- Maintain reproducible research practices: versioning, documentation, and audit-ready artifacts.
- Track metrics tied to evaluator agreement, training data quality, and performance improvement.
Required Qualifications
- Mid-Senior experience in STEM research, engineering R&D, or applied research.
- Strong experimental design, statistical reasoning, and data analysis skills.
- Proficiency with Python and common data/science tooling.
- Ability to write research documentation that is clear, testable, and reproducible.
- Familiarity with machine learning fundamentals and evaluation methods.
- Comfort working remotely with cross-functional stakeholders.
Key skills/competency
- STEM Research
- AI/ML Training Pipelines
- Applied Research
- Data Operations
- Large Language Models
- Model Evaluation
- Dataset Creation
- Experimental Design
- Python
- Machine Learning
Skills & topics
- STEM Research Engineer
- AI
- ML
- Research
- Engineering
- Python
- Data Science
- Machine Learning
- Remote
- Evaluation
How to get hired
- Tailor your resume: Highlight experience in STEM research, AI/ML, experimental design, and Python. Quantify achievements where possible.
- Craft a compelling cover letter: Express your passion for applied research and improving AI/ML pipelines. Show how your skills align with Rex.zone's mission.
- Prepare for technical interviews: Brush up on machine learning fundamentals, statistical reasoning, and experimental design. Be ready to discuss your past research projects in detail.
- Demonstrate remote work skills: Showcase your ability to collaborate effectively with cross-functional teams in a remote setting.
Technical preparation
Master Python and data science libraries.,Practice experimental design and statistical analysis.,Review ML fundamentals and evaluation techniques.,Prepare to discuss research documentation skills.
Behavioral questions
Describe a challenging research problem you solved.,How do you ensure reproducibility in your work?,How do you collaborate with remote, cross-functional teams?,Explain a complex technical concept simply.
Frequently asked questions
- What is the work arrangement for the STEM Research Engineer role at Rex.zone?
- The STEM Research Engineer position at Rex.zone is a full-time, remote role. This means you can work from anywhere, collaborating with global teams.
- What are the primary responsibilities of a STEM Research Engineer at Rex.zone?
- As a STEM Research Engineer, you will focus on improving AI/ML training pipelines through applied research, experiment design, dataset creation, model evaluation, and ensuring reproducible research practices.
- What qualifications are required for this STEM Research Engineer position?
- Rex.zone requires mid-senior experience in STEM research or R&D, strong skills in experimental design, statistical reasoning, data analysis, Python proficiency, and familiarity with machine learning fundamentals and evaluation methods.
- What is the compensation for the STEM Research Engineer role at Rex.zone?
- The compensation for this role ranges from $30 to $50 per hour (USD), depending on your skills and experience.
- How does Rex.zone ensure reproducibility in its research practices?
- Rex.zone emphasizes reproducible research by requiring versioning, thorough documentation, and the creation of audit-ready artifacts for all research activities conducted by STEM Research Engineers.
- What kind of datasets will a STEM Research Engineer work with at Rex.zone?
- STEM Research Engineers at Rex.zone will build and analyze datasets for tasks such as named entity recognition, content safety labeling, and general model evaluation for AI/ML models.