Note: The job is a remote job and is open to candidates in USA. Arva is a company focused on improving greenhouse gas emission reductions and removals, and they are seeking a Modeling Scientist to enhance model traceability, uncertainty quantification, and predictive trustworthiness. This role involves collaboration with ecosystem modelers and data engineers to design frameworks that ensure robust model outputs for various stakeholders.

Responsibilities

• Generate and apply a model traceability framework for ecosystem and biogeochemical models to enable rigorous model testing and improvements
• Design and implement an uncertainty quantification framework, including parameter, structural, aleatory, and epistemic uncertainties
• Apply sensitivity analysis, multivariate testing, and cross-validation to evaluate model robustness and generalizability
• Quantify and communicate model confidence, uncertainty bounds, and performance metrics
• Develop hierarchical and Bayesian approaches for distributed and iterative model optimization
• Apply probabilistic methods to integrate data, models, and uncertainty across scenarios
• Analyze model outputs to diagnose limitations and inform model improvement strategies
• Integrate machine learning techniques with process-based models to improve predictive performance
• Partner with data engineers to implement reproducible, scalable modeling pipelines
• Contribute to the design of model evaluation and optimization workflows
• Communicate uncertainty, confidence intervals, and model performance clearly to stakeholders
• Contribute to scientific reports, model documentation, and peer-reviewed publications
• Support defensible, auditable model outputs for regulatory and credit market review

Skills

• 5+ years demonstrated experience in uncertainty quantification, probabilistic modeling, and data model integration
• Advanced proficiency in Python and scientific computing, with experience building reproducible modeling pipelines
• Strong software engineering practices, including writing modular, testable, and well-documented code
• Deep commitment to scientific rigor, transparency, and integrity
• Master's or PhD degree or equivalent experience in Statistics, Applied Mathematics, Environmental Science, Earth System Science, Biology, or a related quantitative field
• Experience integrating machine learning with process-based or mechanistic models preferred
• Familiarity with ecosystem or Earth system models such as DayCent or CESM preferred
• Familiarity with cloud platforms and data systems, including AWS and relational or spatial databases, preferred

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