Full Stack Engineer - AI Trainer

We are hiring Full Stack Engineers to build complete, production-quality applications that become training examples for frontier AI models. Each application you build is a self-contained, end-to-end product across a different domain and use case. This is remote, asynchronous, project-based work with an expected commitment of 10 to 20 hours per week for the projects you accept.

What you will do:

Design and develop complete, production-quality applications from scratch across a range of business domains using Next.js, Redis, and SQL databases.

Build diverse application types including dashboards, management systems, workflow tools, and data-driven platforms that demonstrate different feature sets and architectural patterns.

Implement full functionality in each application including user authentication, data management, real-time features, reporting, and business logic.

Architect efficient data flows between the frontend, caching layer, and database so applications stay responsive under load.

2 or more years of professional full stack engineering experience.

Strong proficiency in Next.js for building modern frontend applications with server-side rendering and API routes.

Experience with Redis for caching, session management, and real-time data handling.

Solid experience designing and working with SQL databases such as PostgreSQL or MySQL, including schema design, queries, relationships, and optimization.

Experience with Tailwind CSS for building responsive, custom user interfaces.

Preferred qualifications:

Experience shipping complete applications independently rather than working on a single service or component.

Familiarity with authentication patterns, background jobs, and reporting or analytics features.

Comfort switching between unfamiliar domains and picking up new product requirements quickly.

Competitive compensation of $70 to $90 per hour based on your experience.

Fully remote and asynchronous, on your own schedule.

Work directly with an early-stage Y Combinator-backed company on problems that shape how frontier AI models learn to build software.

Pay: $70.00 - $90.00 per hour

AfterQuery is a research lab investigating the boundaries of artificial intelligence through novel datasets and experimentation. We believe great AI comes from exceptional, human-generated data. We are backed by top investors, including Y Combinator and Box Group, and support all leading AI labs.