Job Title: Senior Security Engineer - w2 only Location: Southlake, TX ; Austin, TX / Onsite Duration: 6 months Rate: $60/hr on w2 Responsibilities Key Management & Cryptographic Architecture Design and evolve secure key management architectures leveraging HSMs, MPC, and distributed cryptographic models. Establish end-to-end key lifecycle controls including generation, storage, rotation, signing, and recovery. Define architecture patterns across hot, warm, and cold storage models, articulating