Photonics Engineer Intern - Summer 2027

Lightmatter is hiring a Photonics Engineer Intern - Summer 2027 in Boston, MA. When: Summer 2027. Posted November 11, 2026. Checked against the employer's posting on November 12, 2026.

Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.

Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!

If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.

Lightmatter is (re)inventing the future of computing with light! About this job This team is designing active and passive Silicon Photonics devices and systems that are at the frontier of the technology and core to Lightmatter products.

This job will require diving deep into the physics and working principles of all kinds of device designs, creating test plans, and layouts, analyzing data and experiments and creating models.

Responsibilities: • Design high-performance passive and active silicon photonics devices with commercial softwares such as Lumerical, Tidy3D, Cadence • Develop automated inverse design of silicon photonic components.

• Develop control algorithms for photonics subsystems for real-world use cases • Assess fabrication variability and operational performance of Si photonic components • Develop and implement testing and analysis methodology for new and existing silicon photonics devices, including design-for-test, design-for-manufacturing, and design-of-experiments.

• Design and execute model creation for silicon photonics chips and subsystems based on measurement data and close the loop with design and simulations.

Requirements: • Currently enrolled in a PhD program, specializing in Electrical Engineering, Physics, Photonics, or related fields. • Good understanding of Silicon Photonics or General Photonics • Experience in electro-optic design of silicon photonics components • Demonstrate problem-solving skills in problems that do not have obvious solutions • Exposure to developing and implementing automated design and analysis using Python scripting • Data-driven and analytical; translates numbers into actionable strategies • Process-oriented and programmatic: builds structure through processes • Excellent written and verbal communication skills • Interest in Photonics Design • Willingness and curiosity to learn from an exciting team!

Preferred Qualifications • Experience in design of high speed transceiver systems • Work with foundries • Exposure to designing PDK Components Our internship hourly rates are a standard pay determined based on the position and your location, year in school, degree, and experience.

Hourly Rate in USD $57—$65 USD Benefits • Comprehensive Health Care Plan (Medical, Dental & Vision) • Retirement Savings Matching Program • Life Insurance (Basic, Voluntary & AD&D) • Generous Time Off (Vacation, Sick & Public Holidays) • Paid Family Leave • Short Term & Long Term Disability • Training & Development • Commuter Benefits • Flexible, hybrid workplace model • Equity grants (applicable to full-time employees) Benefits eligibility may vary depending on your employment status and location.

Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.

Export Control Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.