Senior Mechanical Design Engineer - Reactor Module

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About this role

Senior Mechanical Design Engineer - Reactor Module Santa Clara, CA or Remote Thanks for your interest in Oklo! We are searching for an experienced Mechanical Design Engineer to join our team. We are looking to fill this position immediately. Level (Engineer III/Senior) will be determined by experience. Position Description As a Senior Mechanical Design Engineer at Oklo, you will play a central role in designing the critical hardware that enables our advanced fast reactors to operate safely and reliably. This includes technical ownership of large, multi-component weldments and assemblies that comprise the reactor module within our Aurora powerhouses-ranging from the reactor vessel to various internal support structures and primary coolant flow elements. You will be responsible for advancing these components from conceptual design through detailed design and fabrication readiness, ensuring that every element is engineered for performance, manufacturability, industrial Code compliance, and integration into Oklo's broader reactor system. Your work will require deep engagement with cross-functional teams including structural analysts, systems engineers, materials experts, and external design and fabrication partners. This is a high-responsibility role at the heart of our flagship product. Success in this position requires producing quality mechanical solutions in a fast-paced, startup environment where technical excellence and a collaborative mindset are equally valued. Specific responsibilities may include: - Develop and own the design of complex mechanical components and subsystems within the reactor module - Collaborate cross-functionally with other engineering teams to define design and functional requirements, ensuring compliance with safety regulations and industry codes standards (e.g., ASME

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