Senior Full-Stack Software Engineer, AI Core

New

CircleOnline Community Platform

We’re a remote-only team... We seek exceptional individuals around the world, Collaborate across time zonesFull-TimeSenior

Salary$130,000 - $140,000 USD per year

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Job Details

Languages: Proficient in English (spoken, written, and reading) at a CEFR Level C2 / ILR Level 5.
Experience: 6+ years experience
Required Skills: PostgreSQLArtificial IntelligenceFull Stack DevelopmentMySQLRuby on RailsReactA/B testing

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 (e.g., RAG systems, AI agents, LLM-powered tools).
Strong experimentation mindset with experience designing/running A/B tests and iterating quickly.
Ability to collaborate effectively in an async, remote team environment.
Comfort with ambiguity and rapidly learning new technologies.
Strong alignment with company values.
Proficiency in English at CEFR Level C2 / ILR Level 5.

Ship full-stack AI projects end-to-end on a product built in Ruby on Rails backend and React frontend.
Design and run experiments (including A/B tests, AI evaluations, or others) to validate AI features, measure impact, and guide iteration.
Build and integrate components for AI infrastructure and optimize them for performance and reliability to support production-level inferencing.
Improve processes, tools, and systems to scale AI features into production-ready solutions.
Help us stay up-to-date with the cutting-edge AI research, techniques, and tools.
Work closely with Circle's leaders and designers throughout the feature design process.
Foster a bias for action by prioritizing speed of iteration, experimentation, and learning, while maintaining high standards of code quality and user experience.

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