Infrastructure Software Engineer

Crossing Hurdles is a global recruitment firm partnering with leading US-based startups. We are hiring for a rapidly growing frontier AI infrastructure company backed by top-tier venture investors and building core systems for the next generation of AI agents. The company is well-capitalized, growing quickly, and building a highly technical team in San Francisco to work on some of the most challenging problems in reinforcement learning and AI infrastructure.Role SnapshotRole: Member of Technical StaffCompensation: $160K – $600K + Competitive EquityLocation: San Francisco, US | In-person (6 days/week)YOE: 0+ years of experience in full-stack or infrastructure engineering, particularly in low-level systems or as a founding engineerBenefits: Competitive Equity + Visa Sponsorship (evaluated case-by-case)Why should you consider?Work on reinforcement learning environments and infrastructure powering next-generation AI agents.Collaborate with a highly technical team solving complex systems and AI research problems.Build realistic simulation environments, data systems, and tasks for advanced AI training.High ownership in a fast-growing startup backed by top-tier investors.Operate at the frontier of AI development with meaningful real-world impact.