Lightmatter

Sr. Staff Thermal Engineer

Boston, MA; Mountain View, CA · Staff+ · Full-time

Sponsorship not specified$166k-$262kDetected 5 days ago

PythonMATLABAlgorithmsAirflowStatisticsValuationANSYSCFDThermal AnalysisMechanical DesignCommunication

About the role

Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress.
The company invented the world's first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.
Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion.

Perform thermal simulations to influence package and system design.
Propose novel thermal solutions to enable the Lightmatter product portfolio by investigating relevant technologies and design concepts.
Develop and validate thermal models for various packaging designs including modeling heat transfer, airflow, and thermal interactions within complex electronic assemblies.
Collaborate with design engineers to optimize thermal management solutions, including heat sinks, thermal interfaces, and cooling systems. Use CFD results to guide design iterations and improve thermal performance
Drive characterization and validation of thermal designs and electronic assemblies through lab-scale prototyping and/or initiating appropriate experiments with vendors.
Develop analytical or semi-empirical models for quick-turn assessments of new product concepts.
Develop and maintain CFD tools, templates, and best practices to streamline the simulation process and improve efficiency.
Develop automation scripts using Python or MATLAB to improve modeling efficiency.
Write reports and document methodologies.

5 years of experience in package or system thermal analysis.
Deep knowledge of thermal conduction and convective heat transfer concepts.
Experience in performing steady-state and transient thermal analysis using ANSYS Icepak, ANSYS Fluent, and/or Flotherm.
Experience in setting up and interpreting CFD simulations for complex geometries and boundary conditions.
Working knowledge of lab-scale validation techniques.

Knowledge of fluid dynamics and assembly process modeling of 2D/3D packaging technologies and exposure to the thermal challenges associated with these technologies.
Experience in two-phase immersion cooling and single and two phase liquid flow
Knowledge of thermal technologies in high-performance computing and data centers.
Experience with statistical analysis tools and techniques such as DOE and JMP.
Excellent communication skills and ability to work well in cross-functional teams.

total compensation goes beyond base salary, it also includes a new hire equity grant, annual performance-based equity, and other rewards that recognize your impact and contribution.
$166,000 - $262,000 USD

Comprehensive Health Care Plan (Medical, Dental & Vision)
Retirement Savings Matching Program
Life Insurance (Basic, Voluntary & AD&D)
Generous Time Off (Vacation, Sick & Public Holidays)
Paid Family Leave
Short Term & Long Term Disability
Commuter Benefits
Equity grants (applicable to full-time employees)
Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.
Flexible, hybrid workplace model

This listing is sourced directly from Lightmatter's careers page and normalized into a canonical job model.