Senior Identity & Access Management (IAM) Engineer

About Valar Atomics At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level. The Team As part of the Business organization, IT & Enterprise Software delivers the technology infrastructure, enterprise applications, and digital tools that power Valar's operations. The team ensures secure, reliable, and scalable technology solutions that support every function across the company. The Role We are seeking a Senior IAM Engineer to own the design, integration, and governance of identity and access management across our enterprise, with Microsoft Entra ID as the central identity platform. This role is responsible for provisioning and deprovisioning automation (SCIM), single sign-on (SSO) integrations across SaaS and cloud platforms, and mapping application-specific roles and permissions — including Palantir Foundry and Polarion — to Entra security groups to drive automated, role- and department-based license and access management. The ideal candidate has deep hands-on experience with Entra ID, AWS IAM, and enterprise application integration. Key Responsibilities Own end-to-end access management strategy and governance across the organization, with Microsoft Entra ID as the identity backbone. Design and implement SCIM-based user provisioning/deprovisioning integrations between Entra ID and downstream SaaS applications. Configure and maintain SSO integrations (SAML/OIDC) between Entra ID and enterprise SaaS platforms, ensuring secure and reliable authentication. Design and manage the mapping of Palantir Foundry roles and permissions to Entra ID security groups, enabling automated and auditable access assignment. Design and manage the mapping of Polarion roles and permissions to Entra ID groups to automate license assignment and access by role and department. Build automated workflows that assign or revoke SaaS licenses based on Entra group membership, role, and department attributes. Configure and manage AWS IAM roles, policies, and identity federation, including SSO integration between AWS and Entra ID. Implement and maintain conditional access policies, MFA, and least-privilege access controls across integrated platforms. Partner with application owners and business stakeholders to define role-based access control (RBAC) models and access request/approval workflows. Conduct periodic access reviews, certifications, and audits to ensure compliance with internal…