Summer 2026

Intern

Electrical and Pulsed Power Engineering

Posted on 9/17/2025

Xcimer Energy

Xcimer Energy

51-200 employees

Develops inertial fusion power using laser

Compensation Overview

$25 - $35/hr

+ Equity

Denver, CO, USA

In Person

Category
Electrical Engineering (2)
,
Required Skills
CAD
Python
C/C++
Requirements
  • Qualified candidates must be enrolled in a Bachelor's, Master's or PhD degree program from an accredited college or university in mechanical engineering, electrical engineering, physics, nuclear engineering, or other related engineering discipline.
  • Application of technical skills outside of the classroom (examples include: extracurricular projects, volunteering, personal projects, laboratory research, or prior internship/work experience).
  • Proficiency in CAD software for 3D modeling and simulation.
  • Strong written, verbal, communication, and interpersonal skills.
  • Passion for fusion energy!
  • Ability to work full-time onsite through the duration of the 12 week internship program in Denver, CO.
  • Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee of granted asylum.
Responsibilities
  • Mechanical design and hardware development
  • Mechanical and thermal analysis using finite element analysis
  • Systems engineering
  • Manufacturing engineering
  • Electrical engineering (pulsed power)
  • Control systems engineering
  • Computational and software engineering (simulations)
  • Nuclear engineering
  • Optical engineering
  • Plasma physics

Xcimer Energy develops inertial fusion energy technology aiming to generate fusion-powered electricity. Its system uses a 10+ megajoule KrF laser to ignite a hydrogen fusion target inside a HYLIFE-style liquid-wall chamber, which absorbs fusion energy and shields reactor walls for long life. The approach combines a high-energy laser, a consumable fusion target, and a liquid-wall chamber to pursue scalable, laser-driven inertial confinement fusion for power generation. The company’s goal is to make commercial fusion power a reality for utilities within the next decade.

Company Size

51-200

Company Stage

Series A

Total Funding

$117.8M

Headquarters

Denver, Colorado

Founded

2021

Simplify Jobs

Simplify's Take

What believers are saying

  • LPK laser operational; Phoenix completes full architecture by 2026.
  • Raised $100M Series A in June 2024 led by Hedosophia.
  • Received $9M DOE award for laser-driven inertial fusion development.

What critics are saying

  • NIF achieves net gain first, diverting funding from Xcimer by 2027.
  • SPARC tokamak operationalizes by 2026, fragmenting fusion investments.
  • Excimer laser supplier failure delays Denver prototype by 12 months.

What makes Xcimer Energy unique

  • Xcimer develops 10+ MJ KrF excimer lasers for inertial fusion energy.
  • HYLIFE chamber uses lithium salt flow for 40-year lifetime protection.
  • Hybrid direct drive targets enhance fusion energy efficiency and scalability.

Help us improve and share your feedback! Did you find this helpful?

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Life Insurance

Disability Insurance

401(k) Company Match

Paid Vacation

Paid Sick Leave

Paid Holidays

Company Equity

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

6%

2 year growth

16%
Business Wire
Jun 6th, 2024
Xcimer Raises $100 Million to Put Inertial Fusion Energy on Path to Commercialization

Xcimer Energy Inc. today announced that it has raised $100 million in Series A financing led by Hedosophia, with participation from investors includin

Yahoo Finance
Jun 5th, 2024
Xcimer Raises $100 Million to Put Inertial Fusion Energy on Path to Commercialization

DENVER, June 04, 2024--Xcimer Energy Inc. today announced that it has raised $100 million in Series A financing led by Hedosophia, with participation from investors including Breakthrough Energy Ventures, Lowercarbon Capital, Prelude Ventures, Emerson Collective, Gigascale Capital and Starlight Ventures. Xcimer will use this financing to establish a new facility in Denver, where it will build a prototype laser system including the world’s largest nonlinear optical pulse compression system to adv

Business Wire
Jun 2nd, 2023
Xcimer Energy Announces $9 Million US Department of Energy Award to Develop Laser-Driven Inertial Fusion Energy

The US Department of Energy announced Xcimer has been selected for $9M of federal funding for development of laser inertial fusion energy.

INACTIVE