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About the Role

As a Principal Simulation Engineer (Delivery), you are a technical leader and problem solver who is passionate about creating practical, high-impact solutions that enable customers to make better engineering decisions. You combine deep simulation expertise with strong leadership and customer ownership, and you excel at working directly with customers (often directly on-site) to build CAE models that are integrated into AI-tools that are both useful and used.

Responsibilities

Lead the technical direction and delivery of complex multi-physics simulation workstreams, remaining hands-on for the most challenging aspects while guiding teams through execution.
Partner with customers to address their most complex engineering challenges through advanced CAE & AI solutions; present results clearly, recommend actionable next steps, and balance accuracy with efficiency under tight deadlines.
Independently build and/or guide others to develop complex multi-physics models from geometry clean-up and meshing, to simulating and post-processing complex real-world phenomena, integrating experimental data for model validation.
Build robust parametric CAD models (NX or CATIA) coupled with simulation pipeline automation, for executing advanced design optimization and DoE studies.
Work at the intersection of CAE and Data Science to generate high-quality simulation datasets for training Machine/Deep Learning models.
Leverage data sampling techniques to efficiently capture the design space, reduce computational cost, and enhance model accuracy.
Accelerate high-fidelity modelling by using Flux (our cloud platform) and on-premise HPC resources, going beyond smart meshing and model setup to achieve real performance gains.
Continuously improve engineering best practices, adapting CFD model setups and outputs to support the development of Deep Learning surrogates.
Combine project leadership with a strong commitment to mentoring junior colleagues, contributing to a culture of collaboration, growth, and shared success.
Travel globally (North America, Europe, Asia, Oceania), on average 3-4 weeks per quarter, to work side-by-side with customers in building solutions on-site.

Requirements

Deep expertise in fluid mechanics, heat transfer, and multiphase modelling.
Solid ability to apply fundamental knowledge to real-world phenomena across a wide range of engineering applications.
Highly proficient in at least one of Star-CCM+, OpenFOAM, or Fluent.
Adept at automating simulation tools to create scalable optimisation workflows that drive impactful results.
Experience in parametric CAD modelling (NX or CATIA) is an advantage.
Experience in coding in Python/Java, or the ability to quickly learn programming languages, is an advantage.
5+ years of industry experience (post Masters or PhD) in a commercial, non-research environment.
Confident setting up CFD simulations independently.
Confident interpreting complex results with depth.
Confident making informed decisions based on solid engineering judgement.
US citizen only due to the nature of aerospace and defense work.

Skills

Fluid Mechanics
Heat Transfer
Multiphase Modelling
CAE
AI Solutions
Parametric CAD Modelling
NX
CATIA
Python
Java
CFD Simulation
Data Science
Machine Learning
Deep Learning
Data Sampling Techniques
Cloud Platform (Flux)
HPC Resources
Project Leadership
Mentoring

Location

New York
On-site (Manhattan office)

Work Type

Hybrid
Full-time

Experience Level

Principal
5+ years industry experience (post Masters or PhD)

Education Level

Masters or PhD

Salary/Compensations

$200,000 - $300,000

Benefits

Equity options
5% contribution to 401(k)
Free team lunch 1x/week
Private health insurance
Enhanced parental leave (3 months full pay paternity, 6 months full pay maternity)
20 days of Annual Leave (+ Public Holidays)
Personal development support
Subsidized Gympass / Wellhub (for employee and up to 3 family members)
Flexible Spending Account (FSA)

About the Company

PhysicsX is a deep-tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software.
We are building an AI-driven simulation software stack for engineering and manufacturing across advanced industries.
By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility.
Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

Equal Opportunity

We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity.
We strongly encourage individuals from groups traditionally underrepresented in tech to apply.
To help make a change, we sponsor bright women from disadvantaged backgrounds through their university degrees in science and mathematics.
We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with UK employment and equality legislation.
This information is confidential, used only in aggregate form, and will not influence the outcome of your application.