Fullstack Developer — US

About micro1

micro1 is a data engine that helps AI labs train foundational models and enterprises build AI agents. We provide frontier evaluations and reinforcement learning environments used to improve LLM capabilities, as well as contextual evaluations used to monitor and improve AI agents in enterprise settings. Our data engine includes an AI recruiter agent that sources and vets domain experts, a data platform that enables rapid production of high-quality training data, and a pipeline performance system that ensures both quality and velocity.

Our goal is to have 1 billion people doing meaningful work by contributing their expertise to the development of frontier AI models. We’ve raised $40M+ in funding, and our AI recruiter has powered more than 1 million AI-led interviews as our global network of experts expands to form the human intelligence layer for AGI.

Position

This is a high-ownership fullstack role where you’ll contribute to — and grow into owning — core product surfaces end-to-end. You’ll primarily work on building and improving Zara, our AI Recruiter agent, shaping how it operates, scales, and delivers value to users.

What you’ll own:

• Contribute to the design and development of end-to-end fullstack systems powering core product workflows.
• Build clean, scalable backend services and APIs with clear contracts and ownership.
• Develop high-quality, performant frontend interfaces that ship directly to users.
• Participate in data modeling and database performance optimization (schema design, query tuning, maintainability).
• Collaborate closely with product and design to translate ambiguous requirements into shipped systems.
• Uphold engineering quality through code reviews, testing, and continuous improvement.
• Help debug and resolve production issues; contribute to improving reliability and observability.
• Learn to make pragmatic tradeoffs between speed and correctness in a fast-moving AI lab environment.

Your qualification

Preferred background:

• Experience building or contributing to production fullstack systems (internships, projects, or professional experience).
• Strong TypeScript fundamentals across frontend and/or backend.
• Familiarity with backend development using Node.js (NestJS is a plus).
• Experience building user interfaces with React or similar frameworks.
• Understanding of relational databases such as PostgreSQL and basic data modeling principles.
• Familiarity with RESTful APIs and how systems communicate at scale.
• Exposure to cloud platforms like AWS (or similar).
• Awareness of modern architectures (microservices, serverless, or event-driven systems).
• Curiosity, ownership mindset, and strong attention to detail.

Nice to have:

• Experience with CI/CD, infrastructure as code, or DevOps workflows.
• Experience building or contributing to production-grade systems.
• Exposure to AI-adjacent, data-heavy, or ML-powered products.
• Experience working in fast-paced, ambiguous environments (startup, lab, or similar).

Additional details

• Job type: Full-time
• Location: Remote (Must overlap PST timezone at least 6-8 hours)
• Regional hiring notes: This role is being hired in parallel across multiple regions due to coverage needs, compliance requirements, and time-zone alignment. Responsibilities and expectations are identical; employment terms vary by region.