Staff Mechanical & Thermal Simulation Engineer

Job DetailsJob Location: PuneJob Purpose

Navitas Semiconductor (Nasdaq: NVTS) is a next-generation power semiconductor leader driving innovation in gallium nitride (GaN) and high-voltage silicon carbide (SiC) technologies. Our products enable faster, more efficient power delivery across AI data centers, high-performance computing, energy and grid infrastructure, and industrial electrification.

With more than 30 years of combined expertise in wide bandgap technologies, GaNFast™ power ICs integrate GaN power, drive, control, sensing, and protection, delivering faster power delivery, higher system density, and greater efficiency. GeneSiC™ high-voltage SiC devices leverage patented trench-assisted planar technology to provide industry-leading voltage capability, efficiency, and reliability for medium-voltage grid and infrastructure applications.

We are seeking a Staff Mechanical & Thermal Simulation Engineer to join our fast-growing, collaborative team. The ideal candidate is self-motivated, hands-on, and experienced in ANSYS-based thermal and structural simulation and the mechanical design of power converters, supporting our high-voltage SiC product portfolio.

Key Responsibilities and Duties

Perform system-level thermal simulations of power converters and semiconductor assemblies using ANSYS (Icepak, Fluent, Mechanical/Workbench), covering conduction, convection and radiation with forced-air and liquid cooling.
Build electro-thermal models of SiC MOSFET-based converters: import power-loss maps from electrical simulations, estimate junction and case temperatures, and define thermal derating and cooling margins.
Own the mechanical design of power converters and reference designs — enclosures, heatsinks, cold plates, busbars, magnetics mounting, connectors and fasteners — with attention to creepage/clearance and high-voltage isolation requirements for systems up to 10 kV.
Design and optimize thermal stacks, including TIM selection, heatsink and cold-plate design, fan selection and airflow management, for discrete packages (e.g., TO-247) and power modules.
Create 3D CAD models and 2D manufacturing drawings (SolidWorks, Creo or similar) with GD&T and tolerance stack-up analysis for converter assemblies, evaluation (EVAL) boards and test fixtures.
Perform structural, shock and vibration analysis of converter assemblies and support compliance with relevant industrial and automotive standards.
Design mechanical hardware for high-voltage test benches: safety enclosures, interlocked HV fixtures, busbars and probe fixturing for double pulse (DPT), short-circuit and reliability test setups.
Conduct hands-on thermal validation in the lab using thermocouples, IR imaging and airflow/pressure measurements, and correlate simulation models against measured data.
Apply understanding of AI data center power architectures (power shelves, cold-plate liquid cooling, high-density racks) and EV, solar and energy-storage converter packaging to guide mechanical concepts.
Work with heatsink, cold-plate, sheet-metal and plastics suppliers; support prototyping, DFM/DFA and transfer to production.
Develop high-quality thermal design guides, application notes and mechanical documentation for customers and internal teams.
Support the reliability team with test fixtures and thermo-mechanical analysis (thermal cycling, power cycling, CTE mismatch and solder-joint fatigue).
Collaborate with applications, R&D, product marketing, quality and operations teams to support customer programs and product development.

QualificationsKnowledge, Skills, Abilities, and Other Characteristics (KSAO’s)

5+ years of hands-on experience in thermal and mechanical design for power electronics.
Proficiency with ANSYS simulation tools (Icepak, Fluent, Mechanical/Workbench) for CFD, thermal and structural analysis; experience with electro-thermal co-simulation is preferred.
Strong 3D CAD skills (SolidWorks, Creo or similar), including 2D drawings, GD&T and tolerance analysis.
Solid understanding of power semiconductor thermal management: TIMs, heatsinks, cold plates, fans, liquid cooling and package thermal paths.
Experience with mechanical integration of power converters, including busbars, magnetics and high-voltage clearance/creepage considerations.
Hands-on thermal validation experience (thermocouples, IR cameras, airflow measurement) and model-to-measurement correlation.
Experience with shock/vibration analysis and environmental testing is a plus.
Strong written and verbal communication skills with good attention to detail.

Required Qualifications

Basic

Degree in Mechanical Engineering or a related field.
Hands-on experience in thermal and mechanical design of high-voltage power electronics.

Preferred

Proven experience in system-level thermal simulation of power converters using ANSYS.
Strong knowledge of thermal management and mechanical packaging for server and AI data center power systems.

What We Offer

A front-row seat to the future of power electronics. Work on cutting-edge GaN and SiC technologies that are transforming AI data centers, electrification, and global energy infrastructure.
A fast-paced, high-energy environment. We move quickly, make decisions with purpose, and empower employees to take ownership and drive real impact from day one.
A team that shows up and delivers. We care deeply about our mission, our customers, and each other. We collaborate, support one another, and bring intensity and accountability to everything we do.
Full support to succeed. You’ll have access to leadership, cross-functional collaboration, and the resources needed to innovate and execute at a high level.
Competitive total rewards. Competitive compensation package including base salary, performance bonus, and equity awards.