Full Stack Engineer

We are hiring a Full-Stack Software Engineer with strong front-end depth to help scale the contributor-facing marketplace and internal operations platform. Our client is building the human data layer for multimodal intelligence and a marketplace that connects domain experts with high-paying AI training opportunities at leading AI labs. You will own product features end-to-end across React, Django and PostgreSQL, working directly with the CTO in a small, high-ownership engineering team.What you will ownBuild end-to-end product features across the contributor-facing marketplace and internal operations platform.Write Django views, serializers and migrations while keeping the React front ends that consume them in sync.Lead front-end architecture decisions and set the bar for UI quality.Contribute to CI/CD pipeline work using GitHub Actions to Elastic Beanstalk.Support deployment infrastructure and operational reliability.Collaborate with product, design and operations to ship features that scale the marketplace.Performance-optimize and debug across React, Django, PostgreSQL and infrastructure layers.Improve the platform experience for contributors, domain experts, operations users and clients.Must-have requirements3-5+ years of full-stack engineering experience with strong front-end leaning depth.Strong React experience and modern front-end fundamentals.Proven ability to own product features end-to-end without dropping quality on either side of the stack.Working knowledge of Django or a comparable back-end framework such as FastAPI, Rails or similar.PostgreSQL fundamentals including indexing, query optimization and transaction semantics.Performance optimization and debugging ability across the full stack.Experience collaborating cross-functionally with product, design and operations teams.Nice-to-have requirementsPrior marketplace engineering at scale up two-sided marketplace company.Founding engineer experience at YC startups or comparable early-stage companies.Django-Q2 or Celery background for background tasks.Multi-frontend monorepo experience using Vite or separate apps sharing a back end.Experience with security-sensitive code: auth flows, payment webhooks or PII handling.Background in data annotation, recruiting tech, expert networks or markIdeal background:3-5+ years of full-stack engineering experienceStrong React and modern front-end fundamentalsWorking knowledge of Django, FastAPI, Rails or a comparable back-end framework PostgreSQL fundamentalsStartup or high-ownership product engineering experience, preferably YC startups or Unicorns.Marketplace, recruiting tech, AI data, annotation or expert-network experience is a strong plusLocation: San Francisco or Europe. Remote acceptable for Europe-based candidates.