Senior Research Engineer, CFD Algorithm Development

About SandboxAQ

SandboxAQ is a high-growth company delivering AI solutions that address some of the worlds greatest challenges. The companys Large Quantitative Models (LQMs) power advances in life sciences financial services navigation cybersecurity and other sectors.

We are a global team that is tech-focused and includes experts in AI chemistry cybersecurity physics mathematics medicine engineering and other specialties. The company emerged from Alphabet Inc. as an independent growth capital-backed company in 2022 funded by leading investors and supported by a braintrust of industry leaders.

At SandboxAQ weve cultivated an environment that encourages creativity collaboration and impact. By investing deeply in our people were building a thriving global workforce poised to tackle the worlds epic challenges. Join us to advance your career in pursuit of an inspiring mission in a community of like-minded people who value entrepreneurialism ownership and transformative impact.

About the Role

SandboxAQ is seeking a hands-on computational scientist or engineer to lead the CFD Algorithm Development Project. This role involves developing and deploying a differentiable Computational Fluid Dynamics (CFD) framework on multi-GPU and multi-node systems to optimize chemical reactor designs.

The ideal candidate will combine strong technical depth in CFD GPU programming and differentiable simulation with practical experience in model validation and high-performance computing (HPC). You will be responsible for delivering several critical milestones that advance our mission of building AI-driven physics-based optimization tools for next-generation catalytic reactors.

What Youll Do :

• Lead development of differentiable CFD solvers for non-isothermal and reactive flow simulations on mulit-node multi-GPU hardware using JAX
• Design implement and containerize code to ensure reproducibility scalability and ease of deployment across HPC GPU environments.
• Develop optimized parallel linear solvers using FFT or other matrix decompositions
• Extend existing implementation of immersed boundary method to complex geometries and non-periodic boundary conditions
• Extend and validate CFD capabilities from single-node to multi-node GPU systems for both non-reactive and reactive flow regimes.
• Integrate transport equations for up to 50 chemical species using linear numerical methods.
• Validate simulation accuracy against benchmark results and fixed-bed reactor configurations.
• Develop gradient-based optimization scripts to iteratively modify reactor designs based on objective functions defined by catalyst activity and selectivity.
• Collaborate closely with AI model developers to link catalyst property predictions with reactor-scale flow optimization.
• Generate comprehensive technical reports summarizing algorithms scalability differentiability and validation results for milestone reviews.

Required Qualifications

Preferred Qualifications

The US base salary range for this full-time position is expected to be $154k - $216k per year. Our salary ranges are determined by role and level. Within the range individual pay is determined by factors including job-related skills experience and relevant education or training. This role may be eligible for annual discretionary bonuses and equity.

SandboxAQ welcomes all.

We are committed to creating an inclusive culture where we have zero tolerance for discrimination. We invest in our employees personal and professional growth. Once you work with us you cant go back to normalcy because great breakthroughs come from great teams and we are the best in AI and quantum technology.

We offer competitive salaries stock options depending on employment type generous learning opportunities medical / dental / vision family planning / fertility PTO (summer and winter breaks) financial wellness resources 401(k) plans and more.

Equal Employment Opportunity : All qualified applicants will receive consideration regardless of race color ancestry religion sex national origin sexual orientation age citizenship marital status disability gender identity or Veteran status.

Accommodations : We provide reasonable accommodations for individuals with disabilities in job application procedures for open roles. If you need such an accommodation please let a member of our Recruiting team know.

Required Experience :

Senior IC

Key Skills

Administration And Accounting,ABAP,BPO,Art And Craft,Employee Benefits,ACCA

Employment Type : Full-Time

Experience : years

Vacancy : 1

Yearly Salary Salary : 154 - 216