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Focused Energy · 1 month ago

Software Engineer - Digital Twin

San Francisco Bay Area

Full-time

Hybrid

Mid Level

Focused Energy is a fusion energy startup aiming to generate unlimited clean energy. The software engineer will help architect and scale the digital twin platform, turning advanced physics and simulation models into a high-performance software system, while collaborating with scientists and engineers to enhance the simulation codebase.

Clean EnergyEnergyRenewable Energy

Responsibilities

Build architecture for the digital twin platform, balancing performance, scalability, usability, and scientific rigor

Design, develop, and maintain high-performance systems code for fusion reactor studies, with an emphasis on modularity, reuse, and long-term maintainability

Establish and enforce testing, validation, and verification standards to ensure reliability, reproducibility, and trust in simulation results to ensure reliability and robustness

Optimize code for performance and scalability

Professionalize research and prototype code into production-quality software used across teams

Design APIs and interfaces that enable fast iteration and clear communication between simulation, ML, and experimental systems

Improve simulation throughput and turnaround time through performance optimization, parallelization, and scalable infrastructure

Influence how software is built across the company by setting patterns, tooling, and engineering standards

Contribute to the development of a comprehensive software ecosystem for fusion reactor studies

Work closely with experimentalists and technical departments to validate and refine computational models

Collaborate with other research institutions and industry partners on joint projects

Monitor technological advances in systems code and fusion reactor studies

Qualification

Software developmentModelingSimulationHigh-performance computingAPI designCloud infrastructureMachine learningStatisticsCollaborationCommunicationProblem-solving

Required

Comfortable operating in ambiguous, early-stage environments and making architectural tradeoffs with incomplete information

Strong background in software development, engineering and/or computer science, preferably with a strong focus on modeling and simulation

Familiar with the development and management of scalable cloud infrastructure, ideally as used in science, ML or other data processing-heavy use cases

Strong foundation in statistics, computer science and machine learning

Experience building maintainable and testable code bases, including API design and unit testing techniques

Experience with HPC environments and developing scalable simulation workflows

Proficiency in various languages e.g. Python, Fortran, MATLAB, C++

Ability to articulate complex technical concepts clearly to multidisciplinary teams

Preferred

Experience with multi-physics simulations, physics-informed ML, or tightly coupled simulation–ML systems

Background in fusion energy, plasma physics, or adjacent scientific computing domains

Familiarity with systems engineering concepts, including verification, validation, and model lifecycle management

Experience building internal platforms or tools used by other engineers or scientists at scale

Contributions to shared research software, open-source projects, or collaborative academic/industry codebases

Experienced in end-to-end/full-stack system design, ideally within an environment supporting physics, engineering or AI teams

Experience with developing machine learning models at scale from inception to business impact

Benefits

Innovative Technology & Mission: Be part of a cutting-edge company working on groundbreaking research in clean energy and scientific discovery.

Career Development: We invest in our people. This is an opportunity to join an early, growing company at the forefront of new technology, where you’ll have the opportunity to develop and grow your career.

Collaborative Culture: Work with great people in a dynamic, international environment with top-tier scientists, engineers and professionals passionate about solving global challenges.

Ownership: Take ownership from day 1 and drive impact by making decisions, solving challenges and shaping the future of our company.

Your Success is our Success: We offer a competitive salary and company ownership in the form of stock options, giving you a direct stake in our success and ownership in what we build together.

Flexibility: We believe work should adapt to your life—not the other way around. That’s why we offer a hybrid setup, giving you the freedom to work from our office while also enjoying the flexibility to work from home when it suits you.

Events: We organize regular events to foster team bonding, encourage collaboration, and build a strong, supportive company culture. Connect with colleagues across departments, share ideas, and have fun together, both in and outside of the workplace.