Thermal Engineer / Senior Thermal Engineer

Thermal Engineer / Senior Thermal Engineer
Multiphysics Simulation Group — Predictive Engineering, Global Engineering Services
Reports to: Engineering Manager, Thermal & High-Power Systems | Level: Individual
Contributor (Engineer / Senior Engineer) | Location: Bengaluru, India (Global Technical Center)

We are looking for a thermal engineer whose command of heat transfer physics is
genuinely deep — someone who reasons from governing equations, not solver defaults,
and who wants to shape how the world's most thermally demanding electronics are
designed.

ABOUT MOLEX & GLOBAL ENGINEERING SERVICES
Molex, a Koch Industries company, is a global electronics leader designing connectivity solutions
for data center and AI infrastructure, automotive and EV platforms, medical devices, industrial
automation, and aerospace and defense. With operations in more than 40 countries and a portfolio
exceeding 100,000 products, Molex sits at the centre of the connected world.
The Global Engineering Services (GES) function at Molex's Global Technical Center (GTC) in
Bengaluru is the simulation and predictive engineering backbone of the company. Within GES, the
Predictive Engineering organization drives the transition toward Virtual Product Qualification (VPQ)
— a north-star ambition in which physics-based simulation, digital twins and AI-assisted models
replace prototype-heavy development cycles.
Thermal engineering is one of the highest-leverage disciplines in that mission. As AI compute
density, hyperscale data centers and electrified transportation accelerate, the thermal envelope has
become the binding constraint on product performance. This role sits squarely at that constraint.

THE OPPORTUNITY
As a Thermal Engineer or Senior Thermal Engineer within the Multiphysics Simulation Group, you
will own thermal simulation programs across some of the most demanding applications in Molex's
portfolio: liquid-cooled cold plates for AI data centers, high-density connector assemblies operating
at 800G and beyond, high-power connectors for EV charging and industrial power delivery, and
thermally sensitive medical and consumer devices.
This is a physics-first role. We are not looking for someone who can drive a solver GUI; we are
looking for an engineer who understands conjugate heat transfer, can sanity-check a CFD result
against a hand-calculated thermal resistance network, and knows when a turbulence model is being
asked to do something it cannot do.
Working knowledge of AI/ML methods applied to thermal prediction — surrogate models, reduced-
order models, physics-informed learning — is a meaningful bonus and will accelerate your growth
here. It is not a prerequisite. Strong fundamentals are.

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ROLE AT A GLANCE
Role Title Thermal Engineer / Senior Thermal Engineer
Function Global Engineering Services (GES) — Predictive

Engineering

Team Multiphysics Simulation Group
Reports to Engineering Manager, Thermal & High-Power Systems
Location Global Technical Center (GTC), Bengaluru
Experience Engineer: 3–6 years | Senior Engineer: 6–10 years
Qualification B.E./B.Tech required; M.Tech/M.E./MS in Thermal,

Mechanical or allied strongly preferred

Primary Focus Thermal & CFD simulation for high-power, liquid-cooled and

data center product lines

KEY RESPONSIBILITIES
Thermal Simulation & Analysis
• Build, execute and interpret thermal and CFD simulations across conduction, convection,
radiation and conjugate heat transfer for electronic assemblies, connectors and cooling
systems.
• Develop thermal resistance networks, junction-temperature predictions, heat-spreading
models and thermal interface material (TIM) characterisations.
• Model liquid cooling systems — cold plates, manifolds, microchannels — evaluating pressure
drop, thermal resistance, flow uniformity and coolant path optimisation.
• Perform airflow and system-level cooling analysis for data center connectivity, server and
rack-level thermal architectures.
• Conduct mesh independence studies, sensitivity analyses, and validation against analytical
solutions and physical test data.

Engineering Judgement & Correlation
• Establish and defend boundary conditions, material models and turbulence model selections
based on physics reasoning, not convention.
• Correlate simulation predictions against thermal test data; quantify confidence bounds and
communicate uncertainty honestly to stakeholders.
• Identify when a simulation result is not physically credible and drive it to root cause rather than
accepting a converged number.
• Contribute to thermal simulation standards, workflow documentation and internal methodology
development.

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Cross-Functional Delivery
• Partner with product engineering, systems and test teams across Molex's five divisions to
translate thermal findings into design decisions.
• Communicate thermal physics clearly to non-specialist audiences — design engineers,
program managers and business unit leadership.
• Support new product introduction (NPI) programs with thermal risk assessment and design-
for-thermal recommendations.
• For Senior Engineers: mentor junior engineers and PGETs, review their simulation setups,
and act as a technical reference point for the team.

Toward Predictive Engineering
• Contribute thermal simulation data and physical insight to surrogate model and digital twin
development programs.
• Support the reduction of physical thermal testing through credible, well-correlated virtual
qualification.
• Where interest and aptitude allow, participate in AI/ML-assisted thermal prediction initiatives
— reduced-order models, regression-based correlations and physics-informed approaches.

QUALIFICATIONS
Required — Fundamentals Above All
• Deep, working command of conduction, convection, radiation, conjugate heat transfer,
and the physical regimes in which each dominates. You can derive, not just recall.
Thermal & Fluid Physics:
• Solid grasp of Navier-Stokes, boundary layers, turbulence modelling (RANS, k-ε, k-ω,
SST), pressure-velocity coupling and the assumptions embedded in each. Fluid
Mechanics:
• Understanding of finite volume discretisation, convergence, stability, mesh quality and
numerical diffusion — and how each corrupts a result when neglected. Numerical
Methods:
• Hands-on tool experience with at least one commercial CFD/thermal solver: Ansys Fluent,
Ansys Icepak, Simcenter STAR-CCM+, Simcenter Flotherm, or OpenFOAM.
• B.E./B.Tech in Mechanical, Thermal, Aerospace or a closely related engineering discipline.
M.Tech/M.E./MS strongly preferred, particularly with a thesis in heat transfer or fluid
dynamics.
• Engineer level: 3–6 years of applied thermal simulation experience. Senior Engineer level:
6–10 years, with demonstrated independent ownership of thermal programs.
• Ability to sanity-check a simulation with a hand calculation — and the instinct to do so before
presenting results.

Preferred
• Experience with electronics cooling: junction temperature prediction, package-level thermal
characterisation, TIM selection, or heat sink design.
• Exposure to data center thermal management: OSFP/QSFP thermal qualification, co-
packaged optics, server or rack airflow modelling.

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• Familiarity with liquid cooling architectures and relevant standards or benchmarks (ASHRAE,
OCP, JEDEC).
• Experience with high-power or EV thermal applications: power connectors, high-current paths,
busbars, or charging systems.
• Scripting and automation for parametric studies or post-processing: Python, MATLAB, journal
files or solver-native scripting.

Bonus — Not Required
AI and machine learning capability is a genuine differentiator in this role, but it is explicitly a bonus
rather than a prerequisite. We would rather hire an engineer with exceptional thermal fundamentals
and teach them AI methods than the reverse.
• Familiarity with surrogate modelling or reduced-order thermal models.
• Exposure to regression-based thermal correlations, response surface methods, or design-of-
experiments approaches.
• Awareness of Physics-Informed Neural Networks (PINNs) or ML-accelerated CFD concepts.
• Experience with tools such as Ansys SimAI, DEP MeshWorks, HyperStudy, HEEDS, or
comparable optimisation and surrogate platforms.

WHAT MAKES YOU STAND OUT
Technical fundamentals get you considered. Character determines how far you go. At Molex, a
Koch company, we believe virtue precedes talent — and in simulation engineering, that belief has a
very concrete meaning.
• Scientific integrity: you will not present a thermal result you do not believe, regardless of
schedule pressure. You flag uncertainty rather than hiding it.
• Intellectual honesty about limitations: you know what your model does not capture, and you
say so before someone else discovers it.
• Curiosity that predates the job: you have read papers, run side projects, or dug into solver
theory because the physics interested you.
• Ownership: you treat a thermal problem as yours to solve, not as a ticket to close. You raise
risks early.
• Humility with confidence: you hold strong physics opinions and remain genuinely open to
being wrong.

KOCH PRINCIPLE-BASED MANAGEMENT (PBM®)
Molex operates under Koch's Principle-Based Management framework — a long-term, principled
approach to value creation. For an engineer, PBM means your advancement is driven by the value
you create and the character you demonstrate, not by tenure or title.
Virtue & Talents Character, integrity and intellectual honesty come first. We hire
good people and develop great thermal engineers — never the

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reverse.

Principled
Entrepreneurship

See an unmet thermal simulation need? Build the capability.
Initiative is expected, not merely tolerated. Opportunity here is
genuinely unlimited.

Knowledge Creation Simulation is only as valuable as the learning it generates.
Challenge assumptions, document what you discover, and
improve the team's collective capability.

Self-Actualization Your ceiling is not set by your job title. It is set by the value you
create and the depth of expertise you choose to build.

WHAT YOU WILL WORK ON
The thermal problems in this role are real, current, and consequential. Representative areas
include:
• CFD-driven design and qualification of cold plate configurations for AI and high-
performance computing — thermal resistance, pressure drop and flow uniformity
characterisation. Liquid-Cooled Cold Plates:
• Thermal qualification of high-density connector and cage assemblies operating at 800G
and beyond, including co-packaged optics thermal management. Data Center
Connectivity:
• Electro-thermal analysis of power connectors for EV charging, industrial power
distribution and high-current interconnects. High-Power & EV Systems:
• Contributing physics insight and simulation data to reduced-order thermal models that
predict temperature fields in seconds rather than hours. Digital Twins & Surrogate
Models:
• Thermal analysis serving Transportation & Industrial, Datacom & Specialty, Medical &
Pharma, Consumer & Commercial, and Aerospace & Defense product lines. Cross-
Divisional Support:

WHY THIS ROLE
• Work on thermal problems at the genuine frontier of electronics — AI data center cooling is
one of the defining engineering challenges of this decade.
• Access to a full commercial toolchain (Ansys, Simcenter, STAR-CCM+) alongside emerging
AI/ML simulation platforms.
• Sit within a research-oriented simulation group whose outputs shape product qualification
decisions globally, not a downstream execution function.
• Clear technical growth path from Engineer to Senior Engineer to Technical Lead, with
progression driven by contribution.
• A culture that values physics rigour, engineering integrity and long-term capability building
over short-term output metrics.

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Molex is an equal opportunity employer. We believe diverse perspectives make us stronger.