Summer 2026 Internship - Software Engineering

About Pacific Fusion Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy. We are rapidly designing and building a pulsed magnetic fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems. Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand. You can read more about us in this letter from our founders . Why This Role Matters As a Software Engineering Intern , you will help build the user interfaces and backend software systems that allow engineers, scientists and operators to run the fusion demonstration facility. You will work closely with controls engineers, scientists, and operators to develop software that presents real-time system state, manages configuration and data, and supports safe facility operations. What You'll Do Develop and improve web-based user interfaces for: System status and health monitoring Experiment or facility configuration Alerts, events, and diagnostics Assist in building backend services that: Serve real-time and historical facility data Manage configuration, metadata, and system state Interface with controls systems and data pipelines Support integration between: UI applications, backend APIs, and facility systems Write clear, maintainable code and contribute to code reviews Help test, debug, and validate software used in live environments What You Bring Pursuing a degree in Computer Science, Software Engineering, or a related field (Junior, Senior, or graduate student preferred) Coursework or experience in: Software development fundamentals Web or backend programming Familiarity with at least one of: TypeScript / JavaScript Go or Python Basic understanding of: Client–server applications APIs and data flow SQL and NoSQL Databases Additional Requirements: Able to work full time, onsite for a minimum of 10 consecutive weeks beginning in June 2026 Bonus Points For Experience with: React or other modern UI frameworks REST or event-based API Git and collaborative development Interest in: Industrial systems, automation, or controls Data visualization or real-time systems Exposure to: Containers (Docker) Time-series or telemetry data 6+ months of a previous internship, co-op, or academic project experience outside of normal classes GPA of 3.5 or above Basic experience with CAD Software, MATLAB, Python, or Excel What We Offer Real resume building engineering experience Mentorship from experienced engineering professionals Exposure to the full product development lifecycle A collaborative and learning-focused work environment An unforgettable summer! Pay Range: $38 $48 USD Total Compensation Benefits for Eligible Employees Industry-competitive salary Equity plan 6% employer 401k matching Generous paid time off (including sick leave, vacation, paid family leave) Medical, Dental, and Vision insurance Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range. Pacific Fusion is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. Paci ... (truncated, view full listing at source)