# Senior Optical Sensing Engineer at ASML

ASML is hiring a Senior Optical Sensing Engineer. It pays $118k-$173k a year and Level rates it Little AI ●○○○; you can [apply on Level](https://jobsbylevel.com/go/c6c2bde8-c2b0-4ed8-890c-8277c55ac902).

AI Level 1, AI centrality 35 out of 100. Wilton, CT, USA.

## Details

- Company: [ASML](https://jobsbylevel.com/companies/asml)
- AI level: AI Level 1 (score 35 out of 100)
- Location: Wilton, CT, USA
- Salary: $118k-$173k
- Posted: October 8, 2026
- Apply: https://jobsbylevel.com/go/c6c2bde8-c2b0-4ed8-890c-8277c55ac902

## Description

Introduction to the job As a Senior Optical Sensor Design Engineer, you will develop advanced sensor technology for ASML’s semiconductor metrology systems. Your work will help improve the accuracy and performance of equipment used by leading microchip manufacturers. You will join the YieldStar Sensor Group in Wilton, Connecticut. The team develops optical and photonic sensor systems that combine light sources, detectors, fiber optics, electronics, and signal-processing software. Role and responsibilities As a Senior Optical Sensor Design Engineer, you will design and improve optical sensors operating in complex environments. You will use physics, mathematics, electronics, mechanics, and software to turn technical concepts into reliable sensor solutions. Design and model optical systems using CODE V, Zemax, or comparable optical design software. Perform optical tolerancing, wave-propagation modeling, partial-coherence calculations, and other physical optics simulations. Develop polarization models and error budgets to evaluate optical performance and system risks. Process and analyze sensor data using MATLAB or comparable data-analysis tools. Build, align, test, qualify, and troubleshoot complex optical and photonic sensor systems. Design test stands, including concepts, error budgets, hardware selection, and system realization. Investigate technical issues, determine root causes, and support new product introduction and field escalations. Education and experience A bachelor’s degree in optical engineering, physics, or a related technical field, plus four years of relevant experience. A master’s degree in optical engineering, physics, or a related technical field, plus two years of relevant experience. A doctoral degree in optical engineering, physics, or a related technical field. Optical design and tolerancing using CODE V, Zemax, or comparable software. Physical optics modeling using FRED, MATLAB, or comparable simulation software. Optical sensor alignment using collimators, mechanical measurement tools, or interferometers. Optical metrology test design, test stand development, and hardware integration. Optical technologies including polarization devices, relay optics, objectives, light sources, fibers, cameras, and detectors. Data processing, performance trending, and technical root-cause analysis. Skills Working at the cutting edge of tech, you’ll always have new challenges and new problems to solve – and working together is the only way to do that. You won’t work in a silo. Instead, you’ll be part of a creative, dynamic work environment where you’ll collaborate with supportive colleagues. There is always space for creative and unique points of view. You’ll have the flexibility and trust to choose how best to tackle tasks and solve problems. To thrive in this job, you’ll need the following skills: Apply analytical thinking to complex optical and system-level problems. Work independently while seeking input from colleagues when needed. Collaborate with engineering, manufacturing, service, and other technical teams. Communicate technical findings clearly through data, documentation, and presentations. Take ownership of assignments and remain accountable for results. Adapt effectively to changing priorities, workloads, and technical challenges. Identify design limitations, technical bottlenecks, and opportunities for improvement. Maintain accuracy and attention to detail during design, testing, and troubleshooting. Other information This position is located on-site in Wilton, CT. It requires onsite presence to attend in-person work-related events, trainings and meetings and to further ensure teamwork, collaboration and innovation. A flexible workplace arrangement may be available to employees working in roles conducive to remote work (up to two days a week). The essential job functions for this position include, but are not limited to: Commute to ASML’s facility and report to work on a regular and timely basis and complete

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