Senior Chiplet Package Design Engineer (2.5D / 3D Integration)

Position Overview

We are seeking a highly motivated Chiplet Package Design Engineer to drive the development of advanced packaging solutions for next-generation semiconductor products. This role focuses on 2.5D and 3D heterogeneous integration, enabling high-performance computing, AI, networking, and advanced SoC platforms.

The candidate will work cross-functionally with silicon design, system architecture, manufacturing, and OSAT partners to deliver cutting-edge chiplet-based packaging solutions.

Locations: Albany, NY (USA) / Santa Clara, CA (USA) / Tokyo (Japan) / Chitose (Japan)

Employment Type: Full-time

Department: Design Enablement / Advanced Packaging Technology

About Rapidus

Rapidus Corporation, founded in 2022, is Japan-led initiative to build a world-class advanced logic semiconductor foundry. With a bold vision to accelerate innovation, we are pioneering cutting-edge logic semiconductor research, development, design, and manufacturing to transform the global semiconductor industry.

Why Join Us

You will play a central leadership role in building the world’s most advanced 2nm and next‑generation enablement ecosystem, shaping the foundation for future semiconductor innovation.

You will focus on the implementation stages (Synthesis and PnR) of the digital reference flow. Additionally, you will lead the adoption of next-generation automation tools, including AI/ML-driven DSE (Design space exploration)

Key Responsibilities

• Lead the design and development of 2.5D/3D package architectures (e.g., interposer-based, fan-out, and 3D stacking)
• Define and optimize chiplet integration strategies, including die partitioning, interface definition, and interconnect topologies
• Develop package layout and routing for high-speed/high-density interconnects (e.g., HBM, UCIe, PCIe, SerDes)
• Perform and guide signal integrity (SI), power integrity (PI), and thermal analysis
• Collaborate with silicon teams on bump/pad design, floorplanning, and co-design methodologies
• Drive package-substrate co-design including material selection and stack-up definition
• Interface with OSATs and foundries for manufacturability, yield improvement, and cost optimization
• Support DFx (DFM, DFT, DFA) and reliability validation (warpage, stress, electromigration)
• Contribute to package technology roadmap for advanced nodes (2nm and beyond)
• Participate in bring-up, validation, and failure analysis of packaged devices

Required Qualifications

• B.S. or M.S. in Electrical Engineering, Mechanical Engineering, Materials Science, or related field
• 5 years of experience in semiconductor package design, especially advanced packaging
• Hands-on experience with 2.5D/3D packaging technologies (e.g., silicon interposer, TSV, hybrid bonding)
• Strong knowledge of high-speed interfaces and package-level SI/PI considerations
• Experience with industry-standard tools (e.g., Cadence Allegro Package Designer, Sigrity, Ansys HFSS, RedHawk-SC Electrothermal)
• Understanding of package manufacturing processes and OSAT ecosystem
• Ability to work in cross-functional and global teams

Preferred Qualifications

• Experience with chiplet architectures and standards (e.g., UCIe)
• Knowledge of HBM integration, AI accelerators, or HPC systems
• Experience with thermal/mechanical simulation tools (e.g., Ansys Mechanical, Icepak)
• Familiarity with advanced substrates (ABF, glass core, fan-out RDL)
• Experience in co-design with silicon (die-package-system co-optimization)
• Knowledge of yield analysis and reliability modeling
• Japanese language skills (for collaboration with Japan-based teams)

What We Offer

• Opportunity to work on cutting-edge chiplet and heterogeneous integration technologies
• Collaboration with global teams across the US and Japan
• Exposure to next-generation nodes (2nm and beyond)
• Competitive compensation and career growth opportunities

Benefits

• Comprehensive Health, Dental and Vision coverage, fully at company's expense (no deductibles)
• 401k with no employer match