---
title: 'Summer 2027 Internship - Computational and Software Engineering at Xcimer Energy'
canonical: 'https://feeny.ai/job/summer-2027-internship-computational-and-software-engineering-xcimer-energy-t32p0nv8kyvy'
type: 'job'
last_seen: '2026-09-13'
---

# Summer 2027 Internship - Computational and Software Engineering at Xcimer Energy

- **Company:** Xcimer Energy
- **Location:** Denver, CO
- **Compensation:** $25–$35/hr
- **Employment:** internship
- **Work type:** onsite
- **Posted:** 2026-09-11
- **Last confirmed live:** 2026-09-13
- **Apply:** https://jobs.lever.co/xcimer/fee9965c-8040-4614-8fd1-10bddfe3b911

## Job description

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. Join us in powering a better world with inertial fusion!

Join Xcimer’s engineering internship program and gain hands-on experience in designing and building cutting-edge laser-driven inertial fusion hardware and software. As an intern, you will be integral to developing the systems needed for the world’s first commercial fusion energy power plant. We have multiple internship opportunities available across various disciplines, including Mechanical Engineering, Electrical Engineering, Physics, and Software Development. Please apply to the posting that best matches your background and interests.

During this 12-week program at our headquarters in Denver, CO, you’ll work alongside an industry expert mentor to tackle complex, real-world challenges in fields such as structures, mechanisms, optics, pulsed power, computational engineering, plasma physics, and manufacturing. We are seeking interns who are passionate about applying their technical skills, problem-solving abilities, and commitment to quality to drive the future of clean energy!

Application close date: 12/31/2025

Responsibilities will vary depending on each intern's are of expertise and interests

- 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

## Qualifications

- 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 engineer, 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.

## Equal Employment Opportunity

Xcimer Energy is proud to be an Equal Opportunity/Affirmative Action Employer and is committed to attracting, retaining, and developing a highly qualified, diverse, and dedicated work force. Xcimer Energy hires and promotes people on the basis of their qualifications, performance, and abilities. We support the establishment and maintenance of a workplace that fosters trust, equality, and teamwork, in which all employees recognize and appreciate the diversity of individual team members. We provide all qualified applicants for employment and employees with equal opportunities for hire, promotion, and other terms and conditions of employment, regardless of their race, color, religion, gender, sexual orientation, gender identity, national origin/ethnicity, age, physical or mental disability, genetic factors, military/veteran status, or any other status or characteristic protected by federal, state, and/or local law. Xcimer Energy will consider for employment qualified applicants with criminal histories in a manner consistent with applicable federal, state, and local laws. For more information on “EEO Is the Law,” please see here and here.

## Benefits

Benefits Employee Benefits include: Medical, dental, vision, basic and supplemental life insurance, paid parental leave (must be employed at time of birth or adoption), short and long-term disability, 401(k) with a company match of up to 6%. Paid Time Off: 15 days per year based on weekly scheduled hours, 10 paid sick leave, and 13 company-paid holidays for all regular employees (including part-time), fixed-term, and interns. Equity will be granted to eligible employees. Equity is designed to allow employees to share in company results and success.

## About Xcimer Energy

## Company Overview
- **One-liner**: Xcimer Energy is building the world’s most powerful excimer lasers to commercialize inertial fusion energy, delivering safe, affordable, and effectively limitless power while also strengthening national security.
- **Entity Type**: Private (Series A; total funding ~$200M)
- **Headquarters**: Denver, Colorado, United States (with manufacturing operations in Tucson, Arizona)
- **Founded**: 2022
- **Founders**: Conner Galloway (CEO, CSO) and Alexander Valys (President, CTO)

## Core Business
- **Primary industry/industries**: Fusion energy (inertial confinement fusion), laser systems, national security/defense
- **Target customers**: B2B / B2G (utilities, government, defense contractors, national laboratories)
- **Mission or purpose statement**: “Transform decades of scientific progress into commercial fusion plants to deliver safe, affordable, and effectively limitless energy—while improving air defense and national security.”

## Products & Services
- **Phoenix (2026)**: Prototype system demonstrating core laser technology and laser architecture in Denver.
- **Anvil (2028)**: 200 kJ, two-sided inertial fusion energy (IFE) excimer beamline demonstrator using Argos laser modules – the largest laser amplifiers in the world.
- **Vulcan (2031)**: Engineering (wall-plug) breakeven demonstration – world’s largest laser, combining many Argos modules to achieve 4 MJ of laser energy on target, upgradeable to 12 MJ.
- **Athena (2035)**: First commercial laser fusion power plant, delivering 400 MW of electricity to the grid.
- **National Security Applications**: Nuclear Weapons Effects Testing (NWET), stockpile stewardship, and directed energy systems.

## Market Standing
- **Valuation/Market Cap**: Not publicly available
- **Key Metric**: Total funding – “nearly $200 million” per FAQ page; “more than $150M raised” per media page (conflicting reports, both cited)
- **Notable Investors/Partners**: Hedosophia, Breakthrough Energy Ventures, Lowercarbon Capital, Prelude Ventures, Emerson Collective, Starlight Ventures, Wireframe Ventures, Leitmotif Ventures, Gigascale Capital. Also partners with Los Alamos National Laboratory, Lawrence Livermore National Laboratory, Oak Ridge National Laboratory, Naval Research Laboratory, MIT, University of Rochester, General Atomics, Westinghouse.
- **Growth Signals**: Headcount of 109 employees (+45.6% YoY), plans to double the team over the next year, 32 open positions across 5 departments, largest laser fusion award from U.S. Department of Energy’s Milestone-Based Fusion Development Program.

## Competitive Advantages
- **Excimer laser architecture (KrF)**: 30x lower cost per joule than the solid-state lasers used at NIF; technology is commercially proven in semiconductor lithography.
- **Scientifically validated approach**: Only fusion method that has achieved scientific breakeven in the laboratory (NIF ignition).
- **Aggressive but grounded roadmap**: Wall-plug breakeven by 2031, grid power by 2035 – one of the fastest timelines in the industry.
- **Dual-use technology**: Fusion energy platform also serves critical national security applications, opening additional funding and partnership avenues.

## Strategic Focus
- Complete Phoenix and Anvil milestones to de-risk laser architecture.
- Hire and scale the team (targeting double the current headcount).
- Secure site for Vulcan and prepare for engineering breakeven demonstration.
- Advance commercial fusion power plant (Athena) design and regulatory pathways.
- Expand defense and government partnerships.

## Why Work Here
- **Culture highlights**: Values precision, creativity, collaboration, and questioning assumptions. Team includes top talent from fusion, energy, defense, aerospace, semiconductor lithography, and academia.
- **Work environment**: Primarily onsite in Denver, CO (engineering roles); flexible work environment, dog-friendly office, free lunch Tuesdays and Thursdays.
- **Notable perks**: Competitive wages, equity compensation plan, comprehensive health/dental/vision insurance, 401k with employer match, up to 12 weeks paid parental leave, 13 paid holidays, generous sick leave and vacation, relocation package, professional growth opportunities.
- **Internship program**: Highly competitive, hands-on experience in fusion science and engineering; strong track record of converting interns to full-time hires.

## Sources
1. [xcimer.energy/company](https://xcimer.energy/company/)
2. [xcimer.energy/careers](https://xcimer.energy/careers/)
3. [xcimer.energy/faq](https://xcimer.energy/faq/)
4. [xcimer.energy/media](https://xcimer.energy/media/)
5. [linkedin.com/company/xcimer-energy-corporation](https://linkedin.com/company/xcimer-energy-corporation)

## Other roles at Xcimer Energy

- [Summer 2027 Internship - Physics](https://feeny.ai/job/summer-2027-internship-physics-xcimer-energy-denver-rxez3syb9xhx) — Denver, CO
- [Summer 2027 Internship - Optical Engineering](https://feeny.ai/job/summer-2027-internship-optical-engineering-xcimer-energy-denver-bpxgc6w56qn9) — Denver, CO
- [Summer 2027 Internship - Mechanical Engineering](https://feeny.ai/job/summer-2027-internship-mechanical-engineering-xcimer-energy-denver-kdgkh864pf88) — Denver, CO
- [Summer 2027 Internship - Electrical and Pulsed Power Engineering](https://feeny.ai/job/summer-2027-internship-electrical-and-pulsed-power-engineering-xcimer-energy-vqhsgjrzb8qb) — Denver, CO
- [Data Engineer](https://feeny.ai/job/data-engineer-xcimer-energy-denver-nf6k4sr1dzcn) — Denver, CO
- [Laser/Optical Simulation Engineer](https://feeny.ai/job/laser-optical-simulation-engineer-xcimer-energy-denver-5xmhb2cckepp) — Denver, CO
- [Computational Physicist - Fluid Dynamics](https://feeny.ai/job/computational-physicist-fluid-dynamics-xcimer-energy-denver-20az9ksd47d3) — Denver, CO
- [Senior Thermal Analyst](https://feeny.ai/job/senior-thermal-analyst-xcimer-energy-denver-y978v74dnnj9) — Denver, CO
- [Senior Scientific Software Engineer](https://feeny.ai/job/senior-scientific-software-engineer-xcimer-energy-denver-89we5hqhpzsb) — Denver, CO
- [Senior Platform Engineer](https://feeny.ai/job/senior-platform-engineer-xcimer-energy-denver-4j9nqnw3z7hg) — Denver, CO