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The Role
Supports employees with AI tools, including onboarding, access provisioning, application development, testing, documentation, and training. Builds and maintains internal AI applications, works with LLM APIs, MCP servers, agent frameworks, RAG systems, and observability tools, and helps nontechnical teams identify and implement AI use cases. The role also requires awareness of security, data handling, industrial safety, and occasional on-call work.
Summary Generated by Built In
About Commonwealth Fusion Systems:
Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.
Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.
We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.
Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.
If that’s you and this role fits, we want to hear from you.
Join the power movement as an AI & Infrastructure Engineering Intern
We are looking for a talented AI & Infrastructure Engineering Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.
Program Details:
- 26 week internship
- 40-50 hours per week with set hourly salary based on year in school
- Opportunity on site in Devens, MA. If an intern is going to be on site, you will be responsible for your own transportation and housing
- Specific project assignments and required technical skillset will vary based on the team’s existing need.
- Opportunities available for currently enrolled college students in all levels of schooling from bachelor’s degree to PhD
- Interns must be authorized to work in the United States for any employer
What you'll do:
- Serve as first-line support for employees using AI tools:
- Help people build and version their own applications
- Follow repo and file-management best practices
- Get unstuck on the technical side of AI implementation
- Handle AI tooling onboarding:
- Process license requests through the Service Catalog
- Set up GitHub and AI tool access
- Guide teams through creating and publishing marketplace plugins
- Develop and maintain internal AI applications:
- Implement scoped features and write automated tests
- Turn recurring user questions into training content and company documentation
- Meet with teams across the business to document current AI usage, identify aspirational use cases and bespoke problems, and coach interested individuals toward becoming self-sufficient AI developers
What we’re looking for:
- Python backend development
- Git/GitHub workflows: branching, pull requests, code review, etc.
- Experience building with AI coding tools, including configuring project rules, skills, or custom agents
- Working with LLM APIs: tool use, structured outputs, prompt and context management
- Building or deploying an MCP server
- Agent frameworks and observability or evaluation tooling
- RAG fundamentals: embeddings, vector stores
- Docker and Linux basics
- Authentication concepts: SSO, role-based access
- Strong communication - the intern will spend time meeting with non-technical teams
- Security and data-handling awareness - the role touches SSO, access provisioning, and internal data
Must-have Requirements:
- Willingness to travel or work required nights/weekends/on-call occasionally
- Perform activities such as typing, standing, or sitting for extended periods of time
- Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
#LI-Onsite
At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.
We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.
This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.
Skills Required
- Currently enrolled in a bachelor's, master's, or PhD program
- Authorized to work in the United States for any employer
- Python backend development experience
- Git and GitHub workflows, including branching, pull requests, and code review
- Experience building with AI coding tools, including project rules, skills, or custom agents
- Experience working with LLM APIs, tool use, structured outputs, prompt management, and context management
- Experience building or deploying an MCP server
- Familiarity with agent frameworks and observability or evaluation tooling
- Understanding of RAG fundamentals, embeddings, and vector stores
- Docker and Linux basics
- Understanding of authentication concepts, including SSO and role-based access
- Strong communication skills for working with nontechnical teams
- Security and data-handling awareness
- Willingness to travel or work occasional nights, weekends, or on-call shifts
- Ability to type, stand, or sit for extended periods
- Dedication to safety in an industrial environment involving potential hazards such as heat, noise, fumes, strong magnets, lead, high voltage, and cryogenics
Commonwealth Fusion Systems Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Commonwealth Fusion Systems and has not been reviewed or approved by Commonwealth Fusion Systems.
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Healthcare Strength — Health insurance is a core part of the package, with broad medical coverage presented as competitive for a growing tech and engineering employer. This is consistently listed alongside other cornerstone benefits.
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Retirement Support — A 401(k) program with employer match is prominently included in compensation descriptions, signaling support for long-term savings. This appears across roles, including technical and production postings.
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Parental & Family Support — Generous parental leave is cited as a notable element of the offering. It sits alongside paid leave options that many candidates prioritize.
Commonwealth Fusion Systems Insights
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The Company
What We Do
Commonwealth Fusion Systems (CFS) has the fastest, lowest cost path to commercial fusion energy. CFS is collaborating with MIT to leverage decades of research combined with new groundbreaking high-temperature superconducting (HTS) magnet technology. HTS magnets will enable compact fusion power plants that can be constructed faster and at lower cost. CFS is now building SPARC, the world's first commercially relevant, net energy fusion demonstration device. SPARC will pave the way for the first fusion power plant, ARC, that will produce power on the grid. The ultimate mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. CFS has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by the world’s leading investors, CFS is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. If you are interested in joining our team, check out cfs.energy/careers for more information.
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