Senior Full-Stack Software Engineer, Applied AI

New

Circle - UnlistedOnline Community Platform

Fully remote: work from anywhere in the world!, We collaborate across time zones, are highly asyncFull-TimeSenior

Salary130,000 - 140,000 USD per year

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Job Details

Languages: English (CEFR Level C2 / ILR Level 5)
Experience: 6+ years
Required Skills: PostgreSQLFull Stack DevelopmentMySQLRuby on RailsReactA/B testingLLM

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 — whether RAG systems, AI agents, or LLM-powered tools.
Strong experimentation mindset — comfortable designing and running A/B tests, measuring results, and iterating quickly.
A desire to work in an environment which values speed of iteration and individual autonomy.
Comfortable in a fast-paced environment with a certain level of ambiguity.
Proficient in English (spoken, written, and reading) at a 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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