Senior Backend Engineer, Shopping Agents

• Own architecture, code, deploys, monitoring, and on-call for systems that transact around the clock
• Build and operate checkout agents using frontier-model computer-use agents driving live checkouts at scale
• Make checkout-agent failures rare and recovery automatic across changing retailer systems
• Scale product ingestion from hundreds of sources to thousands
• Build infrastructure that generates, validates, and monitors product ingestion
• Develop search and ranking systems using embedding-based retrieval, LLM query understanding, reranking, and caching
• Work directly with the CTO

• 5+ years building backend and infrastructure systems
• Strong Python skills
• Experience owning production systems end to end, including deploys, databases, observability, and on-call
• Ability to address systemic causes rather than isolated incidents
• Ability to work on adversarial systems
• Strong focus on correctness for systems handling customer payments
• Ability to work without a finished specification in a changing roadmap
• Nice to have: experience building AI-first products or LLM-based agents in production
• Nice to have: working knowledge of classic machine learning and deep learning
• Nice to have: background in e-commerce, payments, or fraud and risk infrastructure

• Remote work arrangement
• Full-time employment