ASIC Physical Design Engineer - Power, Senior

Rippling, Inc.; United States; Remote; USD 200,000 - 300,000; Full time

Benefits offered by this job

Medical/Dental/Vision

Life Insurance

Unlimited PTO

Remote-first culture

401(k)

Job summary

Positron AI is seeking a Senior ASIC Physical Design Engineer - Power to lead power estimation, modeling, and optimization across critical blocks for our AI accelerator roadmap. You will collaborate with Architecture, RTL, and Backend teams to push power efficiency and performance per watt.

This role emphasizes UPF/CPF, power integrity, and cross-functional validation, with mentorship for junior engineers and a scalable power methodology for future chips.

Qualifications

• 8+ years of ASIC design or implementation experience with a focus on power.
• Hands-on UPF/CPF power specification and verification flows.
• Strong proficiency with PrimePower and Joules or equivalent power analysis tools.
• Experience working with advanced process nodes.
• A solid grasp of RTL design and its impact on chip power.
• Track record of contributing to power targets on production silicon.
• Strong Tcl and/or Python scripting for analysis and automation.

Responsibilities

• Own power approaches for assigned blocks and subsystems across dynamic power, leakage, clock, memory, interconnect and peak power.
• Build and maintain accurate power models across the development lifecycle.
• Implement and drive power optimization techniques including clock gating, power gating, and DVFS.
• Work with backend on IR drop, EM, power distribution and UPF specifications.
• Collaborate with Architecture, RTL, Backend, Firmware, Thermal, Packaging and System Engineering teams.
• Leverage AI-driven tools to improve power analysis, regression triage and anomaly detection.

Skills

UPF/CPF

Power analysis tools

RTL design impact

Tcl/Python scripting

Process nodes experience

Tools

PrimePower

Joules

UPF/CPF verification

Job description

ASIC Physical Design Engineer - Power, Senior

Positron AI is building next-generation AI inference accelerators designed from the ground up for low-latency, high-throughput large language model inference. Chips built for the training era keep running into two walls at inference time: memory bandwidth and chip-to-chip networking. We designed our architecture to break through both. Our first-generation Atlas systems are deploying in Oracle Cloud Infrastructure. Asimov, our first custom ASIC, takes that architecture to silicon. In simulations, Asimov delivers several times more tokens per dollar and tokens per watt than leading GPUs, at a fraction of the power. Paired in our Titan system, Asimov is built to serve models beyond 16 trillion parameters. In September 2026, we raised $875 million at a $5 billion valuation. NEA led the round, joined by Atreides Management, Valor Equity Partners, and others, to bring Asimov and Titan to market. Our team includes engineers from Groq, Lambda, NVIDIA, Meta, F5, and many other industry leaders.

Role Overview

As a Senior Physical Design Engineer - Power, you will drive power estimation, optimization, and verification for key blocks and subsystems across Positron's AI accelerator roadmap. Working alongside senior technical leadership, you will execute and help improve our power methodology from architectural modeling through silicon validation, helping us deliver industry-leading performance-per-watt while meeting aggressive power and thermal constraints.

Key Responsibilities

Power Architecture & Strategy

• Contribute to the overall chip power strategy, and own power approaches for assigned blocks and subsystems across dynamic power, leakage, clock power, memory power, interconnect power, idle power, and peak power.

Power Modeling

• Build and maintain accurate power models across the development lifecycle, from early architectural estimation through RTL and gate-level estimation.
• Perform vector-based and activity-driven power analysis to validate estimates against real workload behavior.

Power Optimization

• Implement and drive power optimization techniques including clock gating, operand isolation, power gating, voltage islands, and multi-Vt optimization.
• Identify and apply memory, pipeline, toggle-reduction, and data-movement optimizations, including approaches tailored to AI workloads.
• Give RTL teams actionable feedback to reduce power early in the design cycle.

Power Integrity

• Work with the backend team on IR drop, electromigration (EM), power distribution, and power grid analysis.
• Develop and maintain UPF/CPF specifications for assigned domains, including power domains, isolation, retention, power-on sequencing, and reset sequencing.
• Run power-aware simulation and UPF verification for your blocks.
• Support reset verification, low-power state validation, wakeup validation, and power sequencing verification.

Cross-Functional Collaboration

• Partner with Architecture, RTL, Backend, Firmware, Thermal, Packaging, and System Engineering teams to align power decisions across the chip development flow.

AI-Enabled Engineering

• Use AI-driven tools to improve power analysis, regression triage, power anomaly detection, activity clustering, and identification of optimization opportunities.

Required Qualifications

• 8+ years of ASIC design or implementation experience, with a significant focus on power.
• Hands-on experience with UPF/CPF power specification and verification flows.
• Strong proficiency with PrimePower and Joules or equivalent power analysis tools.
• Experience working with advanced process nodes.
• A solid grasp of RTL design and its impact on chip power.
• Track record of contributing to power targets on production silicon.
• Strong Tcl and/or Python scripting skills for analysis and automation.

Preferred Qualifications

• Experience with AI accelerator architectures.
• Familiarity with LPDDR and HBM memory interfaces.
• Working knowledge of PCIe.
• Experience with dynamic voltage and frequency scaling (DVFS).
• Exposure to thermal modeling.
• Hands-on experience with silicon power validation.
• Experience mentoring junior engineers or leading power efforts for a subsystem.

Leveling & Scope

While this role is currently posted at a specific level, we are a growth-oriented organization and are open to hiring at a more senior level for the right candidate. This job description is a focused but generalized overview of the role; specific responsibilities and impact expectations will be tailored to the experience and seniority of the final hire.

What Success Looks Like

Within one year, this person will have delivered power estimates for their assigned blocks that reliably predict silicon behavior, driven measurable power reductions through targeted optimizations, delivered clean UPF and power verification for their domains, and contributed meaningfully to a power methodology that scales across future chip generations.

Why Join Us?

• Play a key role in power estimation and optimization for a new generation of AI inference accelerators, directly contributing to Positron's performance-per-watt leadership.
• Work at the frontier of silicon and AI, on chips built specifically for the demands of large-scale LLM inference.
• Grow your technical scope alongside an experienced, high-caliber implementation team.

The base salary range for this role is $200,000 – $300,000 .

These figures represent the base salary range only and do not include other elements of our total compensation package, equity, or comprehensive benefits.

At Positron AI, we value the unique expertise each candidate brings. While the range above reflects our typical expectation for the position, we reserve the flexibility to exceed this range for candidates whose specialized skills, significant experience, or unique qualifications fall outside the standard scope of the role. Final offers are determined based on a variety of factors, including internal equity and individual impact.

We want you to do your best work and feel confident that you and your family are taken care of. That means comprehensive coverage, real time to rest, and support for your future.

Health and wellness

• Fully company-paid medical, dental, and vision insurance for you and your dependents
• Company-paid life and disability coverage, with voluntary options to add more
• Supplemental hospital, critical illness, and accident coverage available

Time off and flexibility

• Unlimited paid time off — we encourage everyone to truly unplug and recharge
• 13 paid company holidays
• Remote-first culture with a company-provided computer and home office setup

Compensation and future

• Competitive salary and equity
• 401(k) with company matching, eligible from day one

This position is open to candidates currently authorized to work in the U.S. We cannot provide new visa sponsorship for this role but are open to facilitating H-1B visa transfers for eligible candidates.

Equal Opportunity Employer. If you're excited about the role but don't meet every bullet, we'd still love to hear from you.