Full Stack 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 Snapshot

Role: Member of Technical Staff

Compensation: $160K – $600K + Competitive Equity

Location: 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 engineer

Benefits: 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.