Celestial AI

Optical SerDes Validation Engineer

Package Integration Engineer

Senior Director, Applications Engineer

Photonics Systems Test Engineer

AMS Design Engineer

Silicon Packaging Layout Engineer

3DIC Package Architect

Administrative Assistant

PIC Design Engineer

Celestial AI is at the forefront of Generative AI infrastructure, focusing on overcoming data center bottlenecks in interconnect bandwidth, memory bandwidth, and memory capacity with its Photonic Fabric™ technology. This innovation offers a tenfold increase in performance and energy efficiency through optical interface chiplets, interposers, and OMIB, enabling high-bandwidth, low-power, and low-latency optical interfaces for AI accelerators and GPUs. The Staff Optical SerDes Validation Engineer will join the silicon validation team, responsible for validating and characterizing cutting-edge SerDes technologies. This role involves deep technical expertise, hands-on lab work, cross-functional collaboration, and problem-solving to develop robust, high-performance solutions for advanced data communication systems.

Silicon Photonics Process Engineer

About Celestial AIAs 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.ABOUT THE ROLEDo you have a passion for high-speed interfaces and enjoy digging deep into analog and mixed-signal behavior to ensure optimal system performance? We are looking for a Staff Optical SerDes Validation Engineer to join our silicon validation team. In this role, you’ll be responsible for validating and characterizing cutting-edge SerDes technologies used in advanced data communication systems.This position blends deep technical expertise with hands-on lab work, cross-functional collaboration, and creative problem solving. You'll have the opportunity to influence the development of next-generation SerDes IPs and contribute to robust, high-performance solutions that power today’s connected world.ESSENTIAL DUTIES AND RESPONSIBILITIES<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Lead validation and electrical/optical characterization of high-speed SerDes IPs, including ethernet, PCIe and custom optical PHYs, using industry-standard lab instrumentation (oscilloscopes, BERTs, VNAs, spectrum analyzers, etc.)</li><li class="leading-relaxed">Design, develop, and maintain both hardware and software test infrastructure for lab-based performance verification and compliance testing</li><li class="leading-relaxed">Develop reference designs and test platforms to ensure consistent, repeatable evaluation of SerDes interfaces under real-world conditions</li><li class="leading-relaxed">Define and execute validation plans aligned with internal specifications and industry standards (e.g., PCIe, Ethernet, CEI)</li><li class="leading-relaxed">Collaborate closely with analog, digital, DSP, and system architecture teams to debug functional issues, improve performance, and validate feature implementations</li><li class="leading-relaxed">Implement automated test flows and advanced data analysis tools using scripting languages (Python preferred) to improve efficiency and accuracy</li><li class="leading-relaxed">Provide documentation and technical reports on test methodologies, validation results, and failure analysis</li><li class="leading-relaxed">Support cross-functional teams such as production test, reliability, and applications engineering in addressing customer and manufacturing-related concerns</li></ul>QUALIFICATIONS<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Bachelor’s degree in Electrical Engineering, Computer Engineering, or related field with 5+ years of relevant experience; Master’s or Ph.D. with 3+ years of experience preferred</li><li class="leading-relaxed">Solid background in analog/mixed-signal circuit behavior and system-level validation practices</li><li class="leading-relaxed">Extensive hands-on experience handling lab instruments such as oscilloscopes, BERTs, VNAs, spectrum analyzers, signal generators, and other high-speed measurement tools</li><li class="leading-relaxed">Strong hands-on experience with high-speed signal testing and SerDes electrical compliance methods</li><li class="leading-relaxed">Deep familiarity with PCIe, Ethernet, or other SerDes protocols and standards</li><li class="leading-relaxed">Skilled in test automation and data visualization using Python, MATLAB, or equivalent scripting tools</li><li class="leading-relaxed">Excellent troubleshooting skills across analog, digital, and mixed-signal domains</li><li class="leading-relaxed">Strong verbal and written communication skills, including ability to produce clear technical documentation</li><li class="leading-relaxed">Experience with signal and power integrity principles is a plus</li><li class="leading-relaxed">Prior exposure to customer-facing debug support and demo environments is a bonus</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 $185,000.00 - $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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At Nasdaq, we’re proud to be the engine behind the world’s capital markets. But we don’t stop there. We build the technology that drives transparency, trust, and access—helping economies grow and people thrive. Our purpose is to advance economic progress for all. Whether you’re a client, a colleague, or part of our broader community, we’re here to move markets—andpossibilities—forward.

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Join fast growing Index Finance Team whose primary focus is to engage with leadership as a strategic and decision-making partner. Help achieve revenue and margin growth by delivering timely, insightful analysis and driving profitability while maintaining financial order and accuracy. The team consist of highly talented and motivated people based in Vilnius and the US.We are seeking a Financial Analyst with expertise in revenue control/accounting. This role is part of growing Capital Access Platforms finance team, supporting its Index Licensing business. The key focus of this role is to support revenue recognition.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Responsibilities</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Month end close: Manage and execute month end close process ensuring timely and accurate accounting of revenue</li><li class="leading-relaxed">Forecast: utilize your forecasting expertise to provide run rate revenue forecast updates</li><li class="leading-relaxed">Reporting: provide periodic reporting for your manager and business leadership</li><li class="leading-relaxed">Ad-hoc: coordination of various ad hoc requests/tasks within area of responsibility</li><li class="leading-relaxed">Process automation: automate current processes and utilize robotics or AI where possible</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Requirements</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Bachelor's Degree in Accounting, Finance, Mathematics or Business Administration</li><li class="leading-relaxed">Experience Required: up to 1 year</li><li class="leading-relaxed">Highly analytical, detail-oriented, thorough and well organized</li><li class="leading-relaxed">Able to utilize strong analytical skills, ensure accuracy, research and correct errors</li><li class="leading-relaxed">Ability to be flexible, adapt and succeed in a fast-paced, dynamic environment</li><li class="leading-relaxed">Excellent verbal and written communication skills in English</li><li class="leading-relaxed">Strong knowledge of Microsoft Excel (pivot tables and formulas) is required; experience with BI tools (QlikView, Tableau or Microsoft Power BI) is a plus</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">What we offer</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Salary range: 2400-2650 EUR gross monthly, depending on final candidate's experience and skills</li><li class="leading-relaxed">Unlimited access to e-learning platforms, offering continuous and extensive learning opportunities</li><li class="leading-relaxed">Internal Mentorship program - learn from an employee you look up to</li><li class="leading-relaxed">Nasdaq's Flex Day program (additional 6 paid leave days a year)</li><li class="leading-relaxed">Annual monetary bonus and other benefits such as sports club membership compensation</li><li class="leading-relaxed">Comfortable and modern working environment.</li></ul>This is a full time permanent position. As the selection and interview process is ongoing, please submit your application in English as soon as possible. A valid working permit for the EU is mandatory.Please note: Individuals applying for or occupying this position must have no previous unspent convictions for criminal offences under the Criminal Code of the Republic of Lithuania, except for minor road traffic violations.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Come as You Are</h2>Nasdaq is an equal opportunity employer. We positively encourage applications from suitably qualified and eligible candidates regardless of age, color, disability, national origin, ancestry, race, religion, gender, sexual orientation, gender identity and/or expression, veteran status, genetic information, or any other status protected by applicable law.We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request an accommodation.

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