Celestial AI

2.5D/3D Process Development Engineer

Photonics Chip Lead

Director, 2.5D/3D Process Development

Student Intern - Analog Layout Design

Intern - Analog Design

Verification & Emulation Methodology Engineer

Photonics Systems Test Engineer

Product Engineer – ATE, SLT & Optics

Optical SerDes Validation Engineer

Celestial AI is seeking a 2.5D/3D Process Development Engineer to drive AI products from concept to high-volume manufacturing. This role involves utilizing in-depth 2.5D assembly process experience and partner management to lead assembly process technology development in close collaboration with foundries and OSATs. The engineer will ensure design for manufacturing, reliability, and cost, manage package qualification, and innovate advanced package solutions, requiring hands-on experience in TSV and 2.5D/3D CoW assembly development.

Package Integration Engineer

<h1 class="text-3xl md:text-4xl font-extrabold mt-6 mb-4 text-gray-900 tracking-tight">About Celestial AI</h1>As Generative AI continues to advance, the performance drivers for data center infrastructure are shifting from systems-on-chip (SOCs) to systems of chips. In the era of Accelerated Computing, data center bottlenecks are no longer limited to compute performance, but rather the system’s interconnect bandwidth, memory bandwidth, and memory capacity. Celestial AI’s Photonic Fabric™ is the next-generation interconnect technology that delivers a tenfold increase in performance and energy efficiency compared to competing solutions.The Photonic Fabric™ is available to our customers in multiple technology offerings, including optical interface chiplets, optical interposers, and Optical Multi-chip Interconnect Bridges (OMIB). This allows customers to easily incorporate high bandwidth, low power, and low latency optical interfaces into their AI accelerators and GPUs. The technology is fully compatible with both protocol and physical layers, including standard 2.5D packaging processes. This seamless integration enables XPUs to utilize optical interconnects for both compute-to-compute and compute-to-memory fabrics, achieving bandwidths in the tens of terabits per second with nanosecond latencies.This innovation empowers hyperscalers to enhance the efficiency and cost-effectiveness of AI processing by optimizing the XPUs required for training and inference, while significantly reducing the TCO2 impact. To bolster customer collaborations, Celestial AI is developing a Photonic Fabric ecosystem consisting of tier-1 partnerships that include custom silicon/ASIC design, system integrators, HBM memory, assembly, and packaging suppliers.<h1 class="text-3xl md:text-4xl font-extrabold mt-6 mb-4 text-gray-900 tracking-tight">ABOUT THE ROLE</h1>In this role you will utilize your in-depth 2.5D assembly process experience and partner management experience to drive company’s AI products from concept to high volume manufacturing. You will be responsible for managing and driving the assembly process technology development in close collaboration with foundries and OSATs to ensure design for manufacturing, reliability, and cost. Responsibilities will include identification and mitigation of risk to new technologies used in product integration and ensure factory readiness through maturing product during the NPI phase. This job will require you to have hands-on experience in TSV and wafer process development, 2.5D/3D CoW assembly development along with strong project management, written and verbal communication skills as well as a can-do attitude to prioritize and address issues with a high sense of urgency.<h1 class="text-3xl md:text-4xl font-extrabold mt-6 mb-4 text-gray-900 tracking-tight">ESSENTIAL DUTIES AND RESPONSIBILITIES</h1><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Work with cross-functional packaging teams and lead TSV, backend stack development at the foundry along with 2.5D/3D CoW process development at OSATs to bring packaging solutions from concept to prototypes and ramp to high volume manufacturing with aggressive cost reduction strategies</li><li class="leading-relaxed">Actively manage qualification of packages with sensitivity to physics of failures for high thermo-mechanical reliability, while operating within established cost constraints</li><li class="leading-relaxed">Manage internal and external resources effectively and efficiently towards established corporate milestones</li><li class="leading-relaxed">Drive ideation and innovation of advanced package solutions and specifications with vendors to advance productization efforts by Celestial AI</li></ul><h1 class="text-3xl md:text-4xl font-extrabold mt-6 mb-4 text-gray-900 tracking-tight">QUALIFICATIONS</h1><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">10+ years of experience in Semiconductor Packaging, Process and Technology Development</li><li class="leading-relaxed">Expert level understanding of advanced foundry process node and its interaction with Packaging/assembly/substrate across various package technologies is required</li><li class="leading-relaxed">Expertise in advanced packaging technologies: knowledge and insight to deliver high density/high performance interconnects with TSVs in various 2.5D/3D package form factors</li><li class="leading-relaxed">Proven track record of bringing products from Technology development, package design/definition, qualification, NPI through HVM is required</li><li class="leading-relaxed">Working level understanding of cross-functional packaging areas: package architecture, design rules, BOM, enabling material/process technologies, mechanical, design for manufacturing, reliability, and cost</li><li class="leading-relaxed">Familiarity with component & system level reliability, testing, and FA</li><li class="leading-relaxed">Experience with photonics packaging will be preferred but is not necessary</li><li class="leading-relaxed">Experience in project management and communicating technical and project/program status and issue resolution at the executive level</li><li class="leading-relaxed">Excellent problem-solving skills with strong fundamentals in science, sound engineering judgment, and analytical ability</li><li class="leading-relaxed">Effective communicator and comfortable engaging with internal cross functional teams as well as domestic and overseas suppliers</li><li class="leading-relaxed">Excellent attention to detail, process and operationally oriented and self-driven with the ability to work independently and take projects to completion with minimum supervision</li><li class="leading-relaxed">M.S or Ph.D. in Mechanical Engineering, Materials Science or Physics is required</li></ul>For California Location:As an early stage start up, we offer an extremely attractive total compensation package inclusive of competitive base salary, bonus and a generous grant of our valuable early-stage equity. The target base salary for this role is approximately $195,000.00 - $225,000.00. The base salary offered may be slightly higher or lower than the target base salary, based on the final scope as determined by the depth of the experience and skills demonstrated by candidate in the interviews.We offer great benefits (health, vision, dental and life insurance), collaborative and continuous learning work environment, where you will get a chance to work with smart and dedicated people engaged in developing the next generation architecture for high performance computing.Celestial AI Inc. is proud to be an equal opportunity workplace and is an affirmative action employer.#LI-Onsite

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- This assessment gives us an idea of your C++ skills - Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

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Toast

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Toast is building an all-in-one restaurant platform, with a rapidly expanding Payroll & Team Management Suite. This role is for an experienced Counsel to join the Legal team, supporting the Toast Payroll & Team Management business unit. You will guide Product, Engineering, Marketing, Compliance, and Sales teams, gaining a deep understanding of Toast's products and strategies to offer pragmatic legal advice and mitigate risks, focusing on payroll and employee-related products.

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Toast offers remote and hybrid work flexibility. Our Legal & Compliance teams are primarily concentrated in Boston, Chicago, New York, Washington DC, and San Francisco. Candidates residing in these areas will benefit from closer proximity to colleagues and greater access to company resources and events.Toast is driven by building the all-in-one restaurant platform that helps restaurants operate their business, increase sales, engage guests, and keep employees happy. A rapidly expanding part of Toast’s ecosystem is our Payroll & Team Management Suite offering. This Line of Business (LOB) is dedicated to improving team engagement, retention, and operational effectiveness for our customers and their team members.We are hiring an experienced Counsel to join our Legal team. As Counsel, Toast Payroll & Team Management, you will support the Toast Payroll & Team Management business unit, which offers a suite of back-office customer solutions, including but not limited to payroll, tips management, scheduling, and more. The Toast Payroll & Team Management business unit is transforming the way restaurants and retailers manage and connect with their employees. As Counsel, Toast Payroll & Team Management, you will collaborate directly with cross-functional teams, including Product, Engineering, Marketing, Compliance, and Sales. In doing so, you will gain a deep understanding of Toast's products, strategies, and processes to offer pragmatic legal advice and help the business identify and mitigate potential legal risks.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About this roll\* (Responsibilities)</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Guide and advise Product, Engineering, Customer Experience, Sales, and Marketing teams across the entire product development lifecycle, from concept through launch, with a primary focus on payroll and employee-related products.</li><li class="leading-relaxed">Provide practical, solution-oriented advice to business stakeholders on a broad range of legal issues, including product, regulatory compliance, consumer protection, privacy, and various contracts (customer, partnership).</li><li class="leading-relaxed">Stay current on federal, state, and local laws and regulations impacting the Toast Payroll & Team Management platform, creatively navigating complex regulatory environments to ensure a smooth and compliant user experience.</li><li class="leading-relaxed">Advise Marketing and Content teams on customer-facing marketing and editorial content, ensuring advertising and marketing law compliance. This includes reviewing marketing strategies and assets.</li><li class="leading-relaxed">Collaborate with lines of business stakeholders to address customer contractual inquiries, driving standardization to enhance proactive resolution and streamline future processes.</li><li class="leading-relaxed">Partner across multiple functions, exhibiting a deep understanding of Toast products and how their evolution is influenced by applicable laws and regulations.</li></ul><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">Do you have the right ingredients\*? (Must Haves)</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Foundational Requirements:</li><li class="leading-relaxed">J.D. from an ABA-accredited U.S. law school; active state bar membership.</li><li class="leading-relaxed">5+ years of legal experience, preferably in-house with a payroll or HR service provider or a similar fast-paced, high-growth technology/FinTech company offering Team Management solutions.</li><li class="leading-relaxed">Legal Domain Knowledge:</li><li class="leading-relaxed">Deep and current expertise in product, regulatory compliance, privacy, marketing, intellectual property, and consumer protection laws.</li><li class="leading-relaxed">Strong preference for knowledge of multi-state employment laws, including wage and hour and payroll, across the employee lifecycle.</li><li class="leading-relaxed">Functional Legal Application:</li><li class="leading-relaxed">Proven in-house counsel experience advising product teams throughout the entire product lifecycle, exhibiting a deep understanding of product functionality.</li><li class="leading-relaxed">Skilled in drafting and negotiating product integration agreements and managing complex customer terms and conditions negotiations.</li><li class="leading-relaxed">Experience in advertising and marketing law compliance, including reviewing marketing and editorial content.</li><li class="leading-relaxed">Ability to advise on multi-state laws, disclaimers, and disclosures for diverse user groups, demonstrating creative problem-solving in complex regulatory environments.</li><li class="leading-relaxed">Key Competencies:</li><li class="leading-relaxed">Excellent communication skills, able to explain complex legal concepts succinctly to non-legal audiences.</li><li class="leading-relaxed">A highly collaborative approach, with proven ability to integrate effectively into cross-functional teams and build strong partnerships.</li><li class="leading-relaxed">A solution-oriented, customer-service, and growth mindset.</li></ul>\*We love a great bread/food pun<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">AI at Toast</h3>At Toast we’re Hungry to Build and Learn. We believe learning new AI tools empowers us to build for our customers faster, more independently, and with higher quality. We provide these tools across all disciplines, from Engineering and Product to Sales and Support, and are inspired by how our Toasters are already driving real value with them. The people who thrive here are those who embrace changes that let us build more for our customers; it’s a core part of our culture.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">Our Spread\* of Total Rewards</h3>We strive to provide competitive compensation and benefits programs that help to attract, retain, and motivate the best and brightest people in our industry. Our total rewards package goes beyond great earnings potential and provides the means to a healthy lifestyle with the flexibility to meet Toasters’ changing needs. Learn more about our benefits at <a href="https://careers.toasttab.com/toast-benefits" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">https://careers.toasttab.com/toast-benefits</a>.#LI-REMOTEThe base salary range for this role is listed below. The starting salary will be determined based on skills and experience. In addition to base salary, our total rewards components include cash compensation (overtime, bonus/commissions, if eligible), benefits, and equity (if eligible).Pay Range$175,000—$205,000 USD<h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">Diversity, Equity, and Inclusion is Baked into our Recipe for Success</h4>At Toast, our employees are our secret ingredient—when they thrive, we thrive. The restaurant industry is one of the most diverse, and we embrace that diversity with authenticity, inclusivity, respect, and humility. By embedding these principles into our culture and design, we create equitable opportunities for all and raise the bar in delivering exceptional experiences.<h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">We Thrive Together</h4>We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the restaurant community. To learn more about how we work globally and regionally, check out: <a href="https://careers.toasttab.com/locations-toast" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">https://careers.toasttab.com/locations-toast</a>.Apply today!Toast is committed to creating an accessible and inclusive hiring process. As part of this commitment, we strive to provide reasonable accommodations for persons with disabilities to enable them to access the hiring process. If you need an accommodation to access the job application or interview process, please contact <a href="mailto:candidateaccommodations@toasttab.com" target="_blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">candidateaccommodations@toasttab.com</a>.------For roles in the United States, It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

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This assessment gives us an idea of your C++ skills- Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc.- 10 Multiple Choice questions- Average time to complete: 7 to 10 minutes

Let's assess your Data Structures! - This assessment gives us an idea of your problem solving skills using DSA- Companies that evaluate this skillset in interviews: MPL, LILA Games, GSN Games, etc.- 10 Multiple Choice questions

Data Structures and Algorithms

Let's assess your Programming Patterns! ????- This assessment gives us an idea of your code architecture skills- Companies that evaluate this skillset in interviews: Dirtcube, PTW, Playshifu, etc.

Programming Patterns

Let's assess your OOPs skills! ????- This assessment gives us an idea of your fundamental OOPS concepts and Solid principles skills- Companies that evaluate this skillset in interviews: Hitwicket, GSN Games, Tomo Club, etc.

Object Oriented Programming

Let's assess your Unity Skills ????- This assessment gives us an idea of your Unity fundamentals- Companies you can apply for after taking this assessment: Godspeed games, Salvation Games, nCore Games, etc.