Software Engineer - Platform / Applied AI (Full-Stack)

AfterQuery is hiring a Platform and Applied AI Engineer to own the core data infrastructure that powers the company's work with frontier labs. This is a founding-team-adjacent engineering seat: you will shape the systems, practices, and architecture that everything else depends on, with direct access to the founders and full end-to-end ownership. The scope spans full-stack web surfaces, heavy data pipelines, and the pace matches a company scaling faster than any other in YC history.

What you'll own:

• Build and scale complex data-capture workflows across web (Next.js) and desktop (Python), owning reliability and throughput end-to-end
• Architect and optimize high-throughput data pipelines capable of handling heavy production loads
• Set engineering best practices and lay the architectural groundwork for a growing engineering team
• Collaborate directly with the founding team to define product strategy and ship features fast
• Own greenfield infrastructure decisions: storage, caching, search, and message-queue architecture across the platform