Package Layout Design Engineer , Annapurna Labs - AI Silicon Packaging

Annapurna Labs (our organization within AWS) designs silicon and software that accelerates innovation. Customers choose us to create cloud solutions that solve challenges that were unimaginable a short time ago-even yesterday. Our custom chips, accelerators, and software stacks enable us to take on technical challenges that have never been seen before, and deliver results that help our customers change the world.

We are seeking a Package Layout Design Engineer to join our hardware team and contribute to the physical design of advanced IC packages for next-generation machine learning and data center ASICs.

In this role, you will execute package layout tasks from floor planning through tape out and manufacturing release, working closely with senior engineers, SI/PI, thermal, and manufacturing teams to deliver production-ready designs that meet performance, density, and reliability targets.

Key job responsibilities:

• Execute package layout tasks across the design cycle: die floor planning, bump/pad assignment, RDL routing, substrate design, verification, and tape out release.
• Implement physical designs for advanced packaging architectures including 2.5D interposer, 3D-IC, fan-out wafer-level packaging, and silicon bridge technologies (e.g., CoWoS, EMIB, or similar).
• Support package floorplan development considering die placement, bump maps, power/ground distribution, signal escape routing, and decoupling capacitor placement.
• Perform RDL and substrate routing for high-density interconnects including microbumps, C4 bumps, TSVs, microvias, and PTH vias across multi-layer organic substrates or silicon interposers.
• Support die-level RDL routing and bump planning in coordination with ASIC physical design teams to help co-optimize the die-package interface.
• Contribute to cross-level layout co-optimization across die RDL, interposer/substrate, and PCB levels under guidance from senior engineers.
• Assist in maintaining package stack-up definitions in collaboration with SI/PI and materials engineering teams.
• Run physical verification checks (DRC, connectivity, shorts/opens) and support design closure.
• Follow and help refine package design rules and guidelines, working with OSAT partners and foundries to ensure DFM compliance.
• Collaborate with SI/PI engineers to incorporate electrical constraints into the physical layout - impedance-controlled routing, power plane optimization, and critical net shielding.