Test Engineer - ATE & SLT

Company: Celestial AI
Location: Santa Clara
Posted on: February 17, 2026

Job Description:

Job Description Job Description About Celestial AI 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. ABOUT THE ROLE We are seeking a Test Engineer with expertise in Automated Test Equipment (ATE) and System-Level Testing (SLT) to join our team. The ideal candidate will play a key role in developing and optimizing test strategies for semiconductor and optical components. Experience with optics-based testing is a strong plus. ESSENTIAL DUTIES AND RESPONSIBILITIES Develop, debug, and optimize ATE and SLT test programs for production and validation. Work closely with design, product, and validation teams to define and implement test requirements. Analyze test data to improve yield, performance, and reliability. Develop and maintain test patterns and test methodologies for different device types. Support JTAG, boundary scan, and other digital/analog test interfaces. Collaborate with hardware and firmware teams to ensure test coverage and debug failures. Automate data collection, analysis, and reporting to enhance efficiency. Provide failure analysis and debug support for both production and engineering samples. Support new product introduction (NPI) and drive continuous improvement in test coverage and efficiency. If applicable, develop and execute optics-based testing methodologies for integrated photonics or optical components. QUALIFICATIONS Bachelor's or Master's degree in Electrical Engineering with 5 years of Industry experience. Hands-on experience with ATE platforms (e.g., Advantest, Teradyne, LTX, etc.). Experience in SLT, functional testing, and debug at the system level. Proficiency in programming test scripts (Python, C/C++, or equivalent). Strong knowledge of semiconductor testing methodologies, test coverage, and data analysis. Familiarity with JTAG, boundary scan, and communication protocols (I2C, SPI, PCIe, etc.). Experience in failure analysis, yield improvement, and test optimization. Excellent debugging and problem-solving skills. PREFERRED QUALIFICATIONS Experience in optics/photonics testing (lasers, modulators, optical transceivers, etc.). Knowledge of optical instrumentation (power meters, spectrum analyzers, interferometers, etc.). Familiarity with high-speed signal integrity and RF testing. Experience in data visualization tools for test analysis. Working knowledge of Confluence and JIRA. LOCATION : Santa Clara, CA 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

Keywords: Celestial AI, Novato , Test Engineer - ATE & SLT, Engineering , Santa Clara, California