Lightmatter
Sr. Staff Thermo-Mechanical Engineer
Mountain View, CA · Staff+ · Full-time
Sponsorship not specified$169k-$244kDetected 57 days ago
PythonMATLABData AnalysisStatisticsValuationANSYSFEAStructural AnalysisMechanical DesignWriting
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odds of building a lasting career here
53Sponsors, lottery-bound
Cap-exempt (no lottery)0
Sponsors this role58
Entry-level history0
PERM / green-card track0
Lottery odds (Level IV)94
Fits your clock70
Sponsors, but it's cap-subject — you still face the weighted lottery (~61% per draw at Level IV). Good if you win; have a cap-exempt backup on your list.
Lottery odds assume a STEM candidate.
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Files H-1B transfers
10 transfer filings in the last year, covering 10 workers. Median labor-condition decision: 28 days. An employer that already files transfers is one that can take over an existing H-1B.
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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.
Responsibilities
- Develop finite element stress, warpage, and assembly process models for wafer-level and unit-level photonic packaging, identifying design, process, and material parameters to mitigate failure modes and optimize yield.
- Perform analysis to identify key reliability risks under product use conditions and drive appropriate design and material solutions to improve product mechanical integrity.
- Develop analytical or semi-empirical models for quick turn assessments for new product concepts.
- Drive characterization and validation of mechanical designs and electronic assemblies through lab-scale prototyping and vendor-initiated experiments, closing the loop between simulation predictions and physical hardware.
- Develop Python and MATLAB automation frameworks to scale simulation throughput and establish repeatable, high-efficiency modeling workflows.
- Write reports and document methodologies that serve as the technical foundation for the packaging team.
Requirements
- Hands-on experience with multi-physics simulation including thermal-structural coupling, solder joint fatigue modeling, and warpage analysis.
- Strong understanding of semiconductor packaging failure modes including solder fatigue, delamination, CTE mismatch-driven stress, and underfill cracking under thermal cycling conditions.
- Experience with wafer-level and unit-level assembly processes including flip-chip, BGA, and advanced 3D packaging architectures.
- Proficiency in Python and/or MATLAB for simulation automation, data analysis, and scripting.
- Experience driving characterization and validation programs through internal prototyping and external vendor collaboration.
Nice to have
- Experience with photonic packaging technologies including silicon photonics, co-packaged optics, fiber attach, or heterogeneous integration of laser devices.
- Familiarity with optical packaging reliability requirements and the intersection of thermo-mechanical performance with optical alignment stability.
- Experience with statistical analysis tools and techniques such as DOE and JMP.
- Strong creative thinking skills with the ability to solve problems quickly.
Compensation
- 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.
- $169,000 - $244,000 USD
Benefits
- 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
Company info
- Summarize and communicate findings and recommendations with authority to key stakeholders across Lightmatter, suppliers, and customers.
Visa & Work Authorization
- Export Control
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This listing is sourced directly from Lightmatter's careers page and normalized into a canonical job model.