Senior Full-stack Engineer, Applied AI

Circle

Senior Full-stack Engineer developing full-stack AI solutions at Circle. Leveraging AI features and collaborating across teams to drive innovation.

Posted 7/7/2026full-timeRemote • 🌎 Anywhere in the WorldSenior💰 $130,000 - $140,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack development with a focus on Ruby on Rails and React, alongside hands-on experience in building AI features in production environments. Strong ability to design experiments and improve AI infrastructure while thriving in fast-paced settings.

Highest-signal resume keywords

Full-Stack DevelopmentRuby on RailsReactJSAI Feature DevelopmentExperimentation Mindset

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Ruby on RailsMySQLPostgresqlReactJSAI Feature DevelopmentFull-Stack EngineeringHigh-Traffic Production ApplicationsExperiment Design

Soft Skills

Bias for ActionAdaptabilityCollaboration

Industry Keywords

AI InfrastructureCutting-Edge AI ResearchFast-Paced Environment

Tech Stack

Tools & technologies

MySQLPostgresReactRubyRuby on Rails

About the role

Key responsibilities & impact

Ship full-stack AI projects end-to-end on a product built in Ruby on Rails backend and React frontend
Design and run experiments to validate AI features
Build and integrate components for AI infrastructure
Improve processes, tools, and systems to scale AI features
Help stay up-to-date with cutting-edge AI research
Work closely with Circle's leaders and designers
Foster a bias for action by prioritizing speed of iteration

Requirements

What you’ll need

6+ years experience working as a full-stack engineer on high-traffic production applications
Strong proficiency in Ruby on Rails, MySQL / Postgresql, ReactJS
Hands-on experience building AI features in production
Strong experimentation mindset
A desire to work in a fast-paced environment
Strong alignment with company values
Proficient in English (CEFR Level C2 / ILR Level 5)

Benefits

Comp & perks

35 days of paid time off each year
Equity in the company with ongoing refresh grants
Health, wellbeing, and professional growth support