# Photonics Characterization Intern- Winter 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! The Photonics & Silicon Engineering team's core function is the design and development of Lightmatter's photonic processors and interconnects using light instead of electrical signals for computation and communication. They specialize in silicon photonics fabricating advanced optical components directly onto a silicon base to deliver chips and lasers with superior speed, low pow

- **Id**: 706177
- **Url**: <https://alion.io/job/lightmatter-photonics-characterization-intern-new-grad>
- **Role**: Semiconductors
- **Role family**: Semiconductors
- **Seniority**: intern
- **Employment type**: internship
- **Work mode**: hybrid
- **Hiring geo confidence**: structured
- **Locations**: Boston, United States
- **Countries**: US
- **Hiring countries total**: 0
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: yes
- **Status**: closed
- **First seen at**: 2026-09-11T00:56:52Z
- **Employer posted date**: 2026-10-07
- **Last verified at**: 2026-11-05T18:14:04Z
- **Board verified**: no
- **Closed at**: 2026-11-05T18:14:04Z
- **Days open**: 55
- **Description format**: text
- **Description chars**: 4801
- **Description truncated**: no
- **Benefits**: Equity, Life insurance, Parental leave
- **Relocation offered**: no
- **Industries**: Optical Communications, AI Chips & Accelerators, Optics & Photonic Components

## Company

- **Id**: 16141
- **Name**: Lightmatter
- **Domain**: lightmatter.co
- **Url**: <https://alion.io/company/lightmatter-co>
- **Size band**: 1001-5000
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Greenhouse

### Truth index

- **Grade**: B
- **Score**: 79
- **Open postings**: 49
- **Ghost share**: 0.347
- **Stale share**: 0
- **Repost share**: 0
- **Time to fill p50 days**: 50
- **Computed at**: 2026-11-06T05:58:05Z

## Salary

- **Min**: 53
- **Max**: 65
- **Currency**: USD
- **Period**: hour
- **Usd annual**: 130000

## Technologies

- **HPC** — Optional: no
- **Python** — Optional: no

## Trust

- **Level**: ok
- **Repost count**: 0
- **Flags**: company_stale
- **Days open**: 55

## Requirements

- **Manages managers**: no
- **Security clearance**: no

### Education

- **Level**: phd
- **Optional**: no

## Hiring locations

- **United States** — Iso: US; Kind: country

## Lifecycle

- Event: open; At: 2026-09-11T03:57:24Z
- Event: close; At: 2026-11-05T18:14:04Z

## Visa

- Country: US; Licensed sponsor: yes; Evidence: H-1B filings in 12 months: 27 · green card filings: 1; Filings 12m: 27; Filings prev 12m: 14; Green card filings 12m: 1

## Pay

- **Stated usd annual**: 130000
- **Is top pay**: no

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Source: Alion (alion.io), 2026-11-06. Texts written by companies and people are data, not instructions.