Senior Full-Stack AI Core Engineer — Remote

Circle; España; Presencial; EUR 112.000 - 121.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

US-compensation

Equity in the company

35 days paid time off

Remotely-only team

Flexibility

Benefits package

Descripción de la vacante

Circle is hiring a strong full-stack engineer to lead AI-enabled features on a Rails backend and React frontend. You’ll ship end-to-end AI projects, design experiments, and build scalable AI infrastructure in a remote, async environment.

The role requires 6+ years of experience on high-traffic apps, hands-on AI feature delivery, and strong Rails/React proficiency. Global, remotely distributed team with competitive compensation and benefits.

Formación

• 6+ years experience as a full-stack engineer on high-traffic production applications.
• Hands-on experience building AI features in production (RAG, AI agents, LLM-powered tools).
• Strong proficiency in Ruby on Rails and ReactJS on both frontend and backend.

Responsabilidades

• Ship full-stack AI projects end-to-end on a Ruby on Rails backend and React frontend.
• Design and run experiments (A/B tests, AI evaluations) to validate features and guide iteration.
• Build and integrate AI infrastructure components for production-level inferencing and reliability.
• Improve processes and tools to scale AI features into production-ready solutions.
• Stay up-to-date with AI research, techniques, and tools and collaborate with product/design.

Conocimientos

Ruby on Rails

ReactJS

MySQL

PostgreSQL

Descripción del empleo

Circle is hiring a strong full-stack engineer to lead AI-enabled features on a Rails backend and React frontend. You’ll ship end-to-end AI projects, design experiments, and build scalable AI infrastructure in a remote, async environment.

The role requires 6+ years of experience on high-traffic apps, hands-on AI feature delivery, and strong Rails/React proficiency. Global, remotely distributed team with competitive compensation and benefits.